mirror of https://github.com/oxen-io/session-ios
Merge branch 'charlesmchen/cropAndScaleAvatar'
Matthew Chen
7 years ago
commit
c08d81e45f
@ -0,0 +1,510 @@
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//
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// Copyright (c) 2017 Open Whisper Systems. All rights reserved.
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//
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import Foundation
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import MediaPlayer
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class OWSLayerView: UIView {
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let layoutCallback : (() -> Void)
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required init(frame: CGRect, layoutCallback : @escaping () -> Void) {
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self.layoutCallback = layoutCallback
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super.init(frame: frame)
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}
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required init?(coder aDecoder: NSCoder) {
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self.layoutCallback = {
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}
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super.init(coder: aDecoder)
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}
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override var bounds: CGRect {
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didSet {
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layoutCallback()
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}
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}
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override var frame: CGRect {
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didSet {
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layoutCallback()
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}
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}
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}
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// This kind of view is tricky. I've tried to organize things in the
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// simplest possible way.
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//
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// I've tried to avoid the following sources of confusion:
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//
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// * Points vs. pixels. All variables should have names that
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// reflect the units. Pretty much everything is done in points
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// except rendering of the output image which is done in pixels.
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// * Coordinate systems. You have a) the src image coordinates
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// b) the image view coordinates c) the output image coordinates.
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// Wherever possible, I've tried to use src image coordinates.
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// * Translation & scaling vs. crop region. The crop region is
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// implicit. We represent the crop state using the translation
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// and scaling of the "default" crop region (the largest possible
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// crop region, at the origin (upper left) of the source image.
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// Given the translation & scaling, we can determine a) the crop
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// region b) the rectangle at which the src image should be rendered
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// given a dst view or output context that will yield the
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// appropriate cropping.
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class CropScaleImageViewController: OWSViewController {
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let TAG = "[CropScaleImageViewController]"
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// MARK: Properties
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let srcImage: UIImage
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let successCompletion: ((UIImage) -> Void)
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var imageView: UIView!
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// We use a CALayer to render the image for performance reasons.
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var imageLayer: CALayer!
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var dashedBorderLayer: CAShapeLayer!
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// In width/height.
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//
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// TODO: We could make this a parameter.
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var dstSizePixels: CGSize {
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return CGSize(width:210, height:210)
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}
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var dstAspectRatio: CGFloat {
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return dstSizePixels.width / dstSizePixels.height
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}
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// The size of the src image in points.
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var srcImageSizePoints: CGSize = CGSize.zero
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// The size of the default crop region, which is the
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// largest crop region with the correct dst aspect ratio
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// that fits in the src image's aspect ratio,
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// in src image point coordinates.
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var srcDefaultCropSizePoints: CGSize = CGSize.zero
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// N = Scaled, zoomed in.
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let kMaxImageScale: CGFloat = 4.0
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// 1.0 = Unscaled, cropped to fill crop rect.
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let kMinImageScale: CGFloat = 1.0
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// This represents the current scaling of the src image.
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var imageScale: CGFloat = 1.0
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// This represents the current translation from the
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// upper-left corner of the src image to the upper-left
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// corner of the crop region in src image point coordinates.
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var srcTranslation: CGPoint = CGPoint.zero
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// MARK: Initializers
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@available(*, unavailable, message:"use srcImage:successCompletion: constructor instead.")
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required init?(coder aDecoder: NSCoder) {
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self.srcImage = UIImage(named:"fail")!
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self.successCompletion = { _ in
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}
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super.init(coder: aDecoder)
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owsFail("\(self.TAG) invalid constructor")
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configureCropAndScale()
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}
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required init(srcImage: UIImage, successCompletion : @escaping (UIImage) -> Void) {
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// normalized() can be slightly expensive but in practice this is fine.
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self.srcImage = srcImage.normalized()
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self.successCompletion = successCompletion
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super.init(nibName: nil, bundle: nil)
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configureCropAndScale()
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}
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// MARK: Cropping and Scaling
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private func configureCropAndScale() {
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// We use a "unit" view size (long dimension of length 1, short dimension reflects
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// the dst aspect ratio) since we want to be able to perform this logic before we
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// know the actual size of the cropped image view.
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let unitSquareHeight: CGFloat = (dstAspectRatio >= 1.0 ? 1.0 : 1.0 / dstAspectRatio)
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let unitSquareWidth: CGFloat = (dstAspectRatio >= 1.0 ? dstAspectRatio * unitSquareHeight : 1.0)
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let unitSquareSize = CGSize(width: unitSquareWidth, height: unitSquareHeight)
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srcImageSizePoints = srcImage.size
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guard
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(srcImageSizePoints.width > 0 && srcImageSizePoints.height > 0) else {
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return
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}
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// Default
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// The "default" (no scaling, no translation) crop frame, expressed in
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// srcImage's coordinate system.
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srcDefaultCropSizePoints = defaultCropSizePoints(dstSizePoints:unitSquareSize)
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assert(srcImageSizePoints.width >= srcDefaultCropSizePoints.width)
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assert(srcImageSizePoints.height >= srcDefaultCropSizePoints.height)
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// By default, center the crop region in the src image.
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srcTranslation = CGPoint(x:(srcImageSizePoints.width - srcDefaultCropSizePoints.width) * 0.5,
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y:(srcImageSizePoints.height - srcDefaultCropSizePoints.height) * 0.5)
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}
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// Given a dst size, find the size of the largest crop region
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// that fits in the src image.
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private func defaultCropSizePoints(dstSizePoints: CGSize) -> (CGSize) {
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assert(srcImageSizePoints.width > 0)
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assert(srcImageSizePoints.height > 0)
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let imageAspectRatio = srcImageSizePoints.width / srcImageSizePoints.height
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let dstAspectRatio = dstSizePoints.width / dstSizePoints.height
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var dstCropSizePoints = CGSize.zero
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if imageAspectRatio > dstAspectRatio {
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dstCropSizePoints = CGSize(width: dstSizePoints.width / dstSizePoints.height * srcImageSizePoints.height, height: srcImageSizePoints.height)
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} else {
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dstCropSizePoints = CGSize(width: srcImageSizePoints.width, height: dstSizePoints.height / dstSizePoints.width * srcImageSizePoints.width)
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}
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return dstCropSizePoints
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}
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// MARK: View Lifecycle
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override func viewDidLoad() {
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super.viewDidLoad()
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view.backgroundColor = UIColor.white
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self.navigationItem.leftBarButtonItem = UIBarButtonItem(barButtonSystemItem:.stop,
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target:self,
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action:#selector(cancelPressed))
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self.navigationItem.title = NSLocalizedString("CROP_SCALE_IMAGE_VIEW_TITLE",
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comment: "Title for the 'crop/scale image' dialog.")
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createViews()
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}
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// MARK: - Create Views
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private func createViews() {
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let previewTopMargin: CGFloat = 30
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let previewHMargin: CGFloat = 20
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let contentView = UIView()
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self.view.addSubview(contentView)
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contentView.autoPinWidthToSuperview(withMargin:previewHMargin)
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contentView.autoPin(toTopLayoutGuideOf: self, withInset:previewTopMargin)
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createButtonRow(contentView:contentView)
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let imageHMargin: CGFloat = 0
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let imageView = OWSLayerView(frame:CGRect.zero, layoutCallback: {[weak self] _ in
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guard let strongSelf = self else { return }
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strongSelf.updateImageLayout()
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})
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imageView.clipsToBounds = true
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self.imageView = imageView
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contentView.addSubview(imageView)
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imageView.autoPinWidthToSuperview(withMargin:imageHMargin)
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imageView.autoVCenterInSuperview()
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imageView.autoPinToSquareAspectRatio()
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let imageLayer = CALayer()
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self.imageLayer = imageLayer
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imageLayer.contents = srcImage.cgImage
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imageView.layer.addSublayer(imageLayer)
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let dashedBorderLayer = CAShapeLayer()
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self.dashedBorderLayer = dashedBorderLayer
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dashedBorderLayer.strokeColor = UIColor.ows_materialBlue().cgColor
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dashedBorderLayer.lineDashPattern = [10, 10]
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dashedBorderLayer.lineWidth = 4
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dashedBorderLayer.fillColor = nil
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imageView.layer.addSublayer(dashedBorderLayer)
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contentView.isUserInteractionEnabled = true
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contentView.addGestureRecognizer(UIPinchGestureRecognizer(target: self, action: #selector(handlePinch(sender:))))
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contentView.addGestureRecognizer(UIPanGestureRecognizer(target: self, action: #selector(handlePan(sender:))))
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}
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override func viewDidLayoutSubviews() {
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super.viewDidLayoutSubviews()
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updateImageLayout()
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}
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override func viewWillAppear(_ animated: Bool) {
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super.viewWillAppear(animated)
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self.view.layoutSubviews()
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updateImageLayout()
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}
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override func viewDidAppear(_ animated: Bool) {
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super.viewDidAppear(animated)
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updateImageLayout()
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}
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// Given a src image size and a dst view size, this finds the bounds
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// of the largest rectangular crop region with the correct dst aspect
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// ratio that fits in the src image's aspect ratio, in src image point
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// coordinates.
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private func defaultCropFramePoints(imageSizePoints: CGSize, viewSizePoints: CGSize) -> (CGRect) {
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let imageAspectRatio = imageSizePoints.width / imageSizePoints.height
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let viewAspectRatio = viewSizePoints.width / viewSizePoints.height
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var defaultCropSizePoints = CGSize.zero
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if imageAspectRatio > viewAspectRatio {
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defaultCropSizePoints = CGSize(width: viewSizePoints.width / viewSizePoints.height * imageSizePoints.height, height: imageSizePoints.height)
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} else {
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defaultCropSizePoints = CGSize(width: imageSizePoints.width, height: viewSizePoints.height / viewSizePoints.width * imageSizePoints.width)
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}
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let defaultCropOriginPoints = CGPoint(x: (imageSizePoints.width - defaultCropSizePoints.width) * 0.5,
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y: (imageSizePoints.height - defaultCropSizePoints.height) * 0.5)
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assert(defaultCropOriginPoints.x >= 0)
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assert(defaultCropOriginPoints.y >= 0)
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assert(defaultCropOriginPoints.x <= imageSizePoints.width - defaultCropSizePoints.width)
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assert(defaultCropOriginPoints.y <= imageSizePoints.height - defaultCropSizePoints.height)
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return CGRect(origin:defaultCropOriginPoints, size:defaultCropSizePoints)
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}
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// Updates the image view _AND_ normalizes the current scale/translate state.
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private func updateImageLayout() {
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guard let imageView = self.imageView else {
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return
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}
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guard srcImageSizePoints.width > 0 && srcImageSizePoints.height > 0 else {
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return
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}
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guard srcDefaultCropSizePoints.width > 0 && srcDefaultCropSizePoints.height > 0 else {
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return
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}
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let viewSizePoints = imageView.frame.size
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guard
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(viewSizePoints.width > 0 && viewSizePoints.height > 0) else {
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return
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}
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// Normalize the scaling property.
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imageScale = max(kMinImageScale, min(kMaxImageScale, imageScale))
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let srcCropSizePoints = CGSize(width:srcDefaultCropSizePoints.width / imageScale,
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height:srcDefaultCropSizePoints.height / imageScale)
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let minSrcTranslationPoints = CGPoint.zero
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let maxSrcTranslationPoints = CGPoint(x:srcImageSizePoints.width - srcCropSizePoints.width,
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y:srcImageSizePoints.height - srcCropSizePoints.height
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)
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// Normalize the translation property.
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srcTranslation = CGPoint(x: max(minSrcTranslationPoints.x, min(maxSrcTranslationPoints.x, srcTranslation.x)),
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y: max(minSrcTranslationPoints.y, min(maxSrcTranslationPoints.y, srcTranslation.y)))
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let imageViewFrame = imageRenderRect(forDstSize:viewSizePoints)
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// Disable implicit animations.
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CATransaction.begin()
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CATransaction.setDisableActions(true)
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imageLayer.frame = imageViewFrame
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// Mask to circle.
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let maskLayer = CAShapeLayer()
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maskLayer.frame = imageViewFrame
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maskLayer.fillRule = kCAFillRuleEvenOdd
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let maskFrame = CGRect(origin:CGPoint(x:-imageViewFrame.origin.x * 2,
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y: -imageViewFrame.origin.y * 2),
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size:imageView.bounds.size)
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maskLayer.path =
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CGPath(ellipseIn: maskFrame, transform: nil)
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imageLayer.mask = maskLayer
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dashedBorderLayer.frame = imageView.bounds
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dashedBorderLayer.path = UIBezierPath(rect: imageView.bounds).cgPath
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CATransaction.commit()
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}
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private func imageRenderRect(forDstSize dstSize: CGSize) -> CGRect {
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let srcCropSizePoints = CGSize(width:srcDefaultCropSizePoints.width / imageScale,
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height:srcDefaultCropSizePoints.height / imageScale)
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let srcToViewRatio = dstSize.width / srcCropSizePoints.width
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return CGRect(origin: CGPoint(x:srcTranslation.x * -srcToViewRatio,
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y:srcTranslation.y * -srcToViewRatio),
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size: CGSize(width:srcImageSizePoints.width * +srcToViewRatio,
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height:srcImageSizePoints.height * +srcToViewRatio
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))
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}
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var srcTranslationAtPinchStart: CGPoint = CGPoint.zero
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var imageScaleAtPinchStart: CGFloat = 0
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var lastPinchLocation: CGPoint = CGPoint.zero
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var lastPinchScale: CGFloat = 1.0
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func handlePinch(sender: UIPinchGestureRecognizer) {
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switch (sender.state) {
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case .possible:
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break
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case .began:
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srcTranslationAtPinchStart = srcTranslation
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imageScaleAtPinchStart = imageScale
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lastPinchLocation =
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sender.location(in: sender.view)
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lastPinchScale = sender.scale
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break
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case .changed, .ended:
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if sender.numberOfTouches > 1 {
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let location =
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sender.location(in: sender.view)
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let scaleDiff = sender.scale / lastPinchScale
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// Update scaling.
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let srcCropSizeBeforeScalePoints = CGSize(width:srcDefaultCropSizePoints.width / imageScale,
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height:srcDefaultCropSizePoints.height / imageScale)
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imageScale = max(kMinImageScale, min(kMaxImageScale, imageScale * scaleDiff))
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let srcCropSizeAfterScalePoints = CGSize(width:srcDefaultCropSizePoints.width / imageScale,
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height:srcDefaultCropSizePoints.height / imageScale)
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// Since the translation state reflects the "upper left" corner of the crop region, we need to
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// adjust the translation when scaling to preserve the "center" of the crop region.
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srcTranslation.x += (srcCropSizeBeforeScalePoints.width - srcCropSizeAfterScalePoints.width) * 0.5
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srcTranslation.y += (srcCropSizeBeforeScalePoints.height - srcCropSizeAfterScalePoints.height) * 0.5
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// Update translation.
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let viewSizePoints = imageView.frame.size
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let srcCropSizePoints = CGSize(width:srcDefaultCropSizePoints.width / imageScale,
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height:srcDefaultCropSizePoints.height / imageScale)
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let viewToSrcRatio = srcCropSizePoints.width / viewSizePoints.width
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let gestureTranslation = CGPoint(x:location.x - lastPinchLocation.x,
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y:location.y - lastPinchLocation.y)
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srcTranslation = CGPoint(x:srcTranslation.x + gestureTranslation.x * -viewToSrcRatio,
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y:srcTranslation.y + gestureTranslation.y * -viewToSrcRatio)
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lastPinchLocation = location
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lastPinchScale = sender.scale
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}
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break
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case .cancelled, .failed:
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srcTranslation = srcTranslationAtPinchStart
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imageScale = imageScaleAtPinchStart
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break
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}
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updateImageLayout()
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}
|
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var srcTranslationAtPanStart: CGPoint = CGPoint.zero
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func handlePan(sender: UIPanGestureRecognizer) {
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switch (sender.state) {
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case .possible:
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break
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case .began:
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srcTranslationAtPanStart = srcTranslation
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break
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case .changed, .ended:
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let viewSizePoints = imageView.frame.size
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let srcCropSizePoints = CGSize(width:srcDefaultCropSizePoints.width / imageScale,
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height:srcDefaultCropSizePoints.height / imageScale)
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let viewToSrcRatio = srcCropSizePoints.width / viewSizePoints.width
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let gestureTranslation =
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sender.translation(in: sender.view)
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// Update translation.
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srcTranslation = CGPoint(x:srcTranslationAtPanStart.x + gestureTranslation.x * -viewToSrcRatio,
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y:srcTranslationAtPanStart.y + gestureTranslation.y * -viewToSrcRatio)
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break
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case .cancelled, .failed:
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srcTranslation
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= srcTranslationAtPanStart
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break
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}
|
||||
|
||||
updateImageLayout()
|
||||
}
|
||||
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||||
private func createButtonRow(contentView: UIView) {
|
||||
let buttonTopMargin = ScaleFromIPhone5To7Plus(30, 40)
|
||||
let buttonBottomMargin = ScaleFromIPhone5To7Plus(25, 40)
|
||||
|
||||
let buttonRow = UIView()
|
||||
self.view.addSubview(buttonRow)
|
||||
buttonRow.autoPinWidthToSuperview()
|
||||
buttonRow.autoPinEdge(toSuperviewEdge:.bottom, withInset:buttonBottomMargin)
|
||||
buttonRow.autoPinEdge(.top, to:.bottom, of:contentView, withOffset:buttonTopMargin)
|
||||
|
||||
let doneButton = createButton(title: NSLocalizedString("BUTTON_DONE",
|
||||
comment: "Label for generic done button."),
|
||||
color : UIColor.ows_materialBlue(),
|
||||
action: #selector(donePressed))
|
||||
buttonRow.addSubview(doneButton)
|
||||
doneButton.autoPinEdge(toSuperviewEdge:.top)
|
||||
doneButton.autoPinEdge(toSuperviewEdge:.bottom)
|
||||
doneButton.autoHCenterInSuperview()
|
||||
}
|
||||
|
||||
private func createButton(title: String, color: UIColor, action: Selector) -> UIButton {
|
||||
let buttonFont = UIFont.ows_mediumFont(withSize:ScaleFromIPhone5To7Plus(18, 22))
|
||||
let buttonCornerRadius = ScaleFromIPhone5To7Plus(4, 5)
|
||||
let buttonWidth = ScaleFromIPhone5To7Plus(110, 140)
|
||||
let buttonHeight = ScaleFromIPhone5To7Plus(35, 45)
|
||||
|
||||
let button = UIButton()
|
||||
button.setTitle(title, for:.normal)
|
||||
button.setTitleColor(UIColor.white, for:.normal)
|
||||
button.titleLabel!.font = buttonFont
|
||||
button.backgroundColor = color
|
||||
button.layer.cornerRadius = buttonCornerRadius
|
||||
button.clipsToBounds = true
|
||||
button.addTarget(self, action:action, for:.touchUpInside)
|
||||
button.autoSetDimension(.width, toSize:buttonWidth)
|
||||
button.autoSetDimension(.height, toSize:buttonHeight)
|
||||
return button
|
||||
}
|
||||
|
||||
// MARK: - Event Handlers
|
||||
|
||||
func cancelPressed(sender: UIButton) {
|
||||
dismiss(animated: true, completion:nil)
|
||||
}
|
||||
|
||||
func donePressed(sender: UIButton) {
|
||||
let successCompletion = self.successCompletion
|
||||
dismiss(animated: true, completion: {
|
||||
guard let dstImage = self.generateDstImage() else {
|
||||
return
|
||||
}
|
||||
successCompletion(dstImage)
|
||||
})
|
||||
}
|
||||
|
||||
// MARK: - Output
|
||||
|
||||
func generateDstImage() -> UIImage? {
|
||||
let hasAlpha = false
|
||||
let dstScale: CGFloat = 1.0 // The size is specified in pixels, not in points.
|
||||
UIGraphicsBeginImageContextWithOptions(dstSizePixels, !hasAlpha, dstScale)
|
||||
|
||||
let context = UIGraphicsGetCurrentContext()
|
||||
context!.interpolationQuality = .high
|
||||
|
||||
let imageViewFrame = imageRenderRect(forDstSize:dstSizePixels)
|
||||
srcImage.draw(in:imageViewFrame)
|
||||
|
||||
let scaledImage = UIGraphicsGetImageFromCurrentImageContext()
|
||||
if scaledImage == nil {
|
||||
owsFail("\(TAG) could not generate dst image.")
|
||||
}
|
||||
UIGraphicsEndImageContext()
|
||||
return scaledImage
|
||||
}
|
||||
}
|
||||
Loading…
Reference in New Issue