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82 lines
3.1 KiB
Swift
82 lines
3.1 KiB
Swift
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public final class InputTextView : UITextView, UITextViewDelegate {
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private weak var snDelegate: InputTextViewDelegate?
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private let maxWidth: CGFloat
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private lazy var heightConstraint = self.set(.height, to: minHeight)
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public override var text: String! { didSet { handleTextChanged() } }
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// MARK: UI Components
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private lazy var placeholderLabel: UILabel = {
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let result = UILabel()
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result.text = "Message"
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result.font = .systemFont(ofSize: Values.mediumFontSize)
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result.textColor = Colors.text.withAlphaComponent(Values.mediumOpacity)
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return result
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}()
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// MARK: Settings
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private let minHeight: CGFloat = 22
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private let maxHeight: CGFloat = 80
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// MARK: Lifecycle
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init(delegate: InputTextViewDelegate, maxWidth: CGFloat) {
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snDelegate = delegate
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self.maxWidth = maxWidth
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super.init(frame: CGRect.zero, textContainer: nil)
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setUpViewHierarchy()
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self.delegate = self
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}
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public override init(frame: CGRect, textContainer: NSTextContainer?) {
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preconditionFailure("Use init(delegate:) instead.")
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}
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public required init?(coder: NSCoder) {
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preconditionFailure("Use init(delegate:) instead.")
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}
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private func setUpViewHierarchy() {
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showsHorizontalScrollIndicator = false
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showsVerticalScrollIndicator = false
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backgroundColor = .clear
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textColor = Colors.text
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font = .systemFont(ofSize: Values.mediumFontSize)
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tintColor = Colors.accent
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keyboardAppearance = isLightMode ? .light : .dark
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heightConstraint.isActive = true
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let horizontalInset: CGFloat = 2
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textContainerInset = UIEdgeInsets(top: 0, left: horizontalInset, bottom: 0, right: horizontalInset)
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addSubview(placeholderLabel)
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placeholderLabel.pin(.leading, to: .leading, of: self, withInset: horizontalInset + 3) // Slight visual adjustment
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placeholderLabel.pin(.top, to: .top, of: self)
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pin(.trailing, to: .trailing, of: placeholderLabel, withInset: horizontalInset)
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pin(.bottom, to: .bottom, of: placeholderLabel)
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}
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// MARK: Updating
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public func textViewDidChange(_ textView: UITextView) {
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handleTextChanged()
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}
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private func handleTextChanged() {
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defer { snDelegate?.inputTextViewDidChangeContent(self) }
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placeholderLabel.isHidden = !text.isEmpty
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let height = frame.height
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let size = sizeThatFits(CGSize(width: maxWidth, height: .greatestFiniteMagnitude))
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// `textView.contentSize` isn't accurate when restoring a multiline draft, so we set it here manually
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self.contentSize = size
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let newHeight = size.height.clamp(minHeight, maxHeight)
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guard newHeight != height else { return }
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heightConstraint.constant = newHeight
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snDelegate?.inputTextViewDidChangeSize(self)
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}
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}
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// MARK: Delegate
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protocol InputTextViewDelegate : class {
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func inputTextViewDidChangeSize(_ inputTextView: InputTextView)
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func inputTextViewDidChangeContent(_ inputTextView: InputTextView)
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}
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