Add animated image preview to attachment approval dialog.

// FREEBIE

Signal/src/Signal-Bridging-Header.h

@@ -7,6 +7,7 @@
 #import "Asserts.h"
 #import "AttachmentSharing.h"
 #import "Environment.h"
+#import "FLAnimatedImage.h"
 #import "NotificationsManager.h"
 #import "OWSAnyTouchGestureRecognizer.h"
 #import "OWSCallNotificationsAdaptee.h"

Signal/src/ViewControllers/AttachmentApprovalViewController.swift

@@ -63,7 +63,9 @@ class AttachmentApprovalViewController: UIViewController {
 
         createButtonRow(attachmentPreviewView:attachmentPreviewView)
 
-        if attachment.isImage {
+        if attachment.isAnimatedImage {
+            createAnimatedPreview(attachmentPreviewView:attachmentPreviewView)
+        } else if attachment.isImage {
             createImagePreview(attachmentPreviewView:attachmentPreviewView)
         } else if attachment.isVideo {
             createVideoPreview(attachmentPreviewView:attachmentPreviewView)
@@ -72,6 +74,20 @@ class AttachmentApprovalViewController: UIViewController {
         }
     }
 
+    private func createAnimatedPreview(attachmentPreviewView: UIView) {
+        // Use Flipboard FLAnimatedImage library to display gifs
+        guard let animatedImage = FLAnimatedImage(gifData:attachment.data) else {
+            createGenericPreview(attachmentPreviewView:attachmentPreviewView)
+            return
+        }
+        let animatedImageView = FLAnimatedImageView()
+        animatedImageView.animatedImage = animatedImage
+        animatedImageView.contentMode = .scaleAspectFit
+        attachmentPreviewView.addSubview(animatedImageView)
+        animatedImageView.autoPinWidthToSuperview()
+        animatedImageView.autoPinHeightToSuperview()
+    }
+
     private func createImagePreview(attachmentPreviewView: UIView) {
         var image = attachment.image
         if image == nil {

Signal/src/ViewControllers/MessagesViewController.m

@@ -110,12 +110,9 @@ typedef enum : NSUInteger {
 }
 
 - (BOOL)pasteBoardHasPossibleAttachment {
-    if ([SignalAttachment pasteboardHasPossibleAttachment]) {
-        // We don't want to load/convert images more than once so we
-        // only do a cursory validation pass at this time.
-        return YES;
-    }
-    return NO;
+    // We don't want to load/convert images more than once so we
+    // only do a cursory validation pass at this time.
+    return [SignalAttachment pasteboardHasPossibleAttachment];
 }
 
 - (BOOL)canPerformAction:(SEL)action withSender:(id)sender {

Signal/src/ViewControllers/SignalAttachment.swift

@@ -262,6 +262,10 @@ class SignalAttachment: NSObject {
         return SignalAttachment.outputImageUTISet.contains(dataUTI)
     }
 
+    public var isAnimatedImage: Bool {
+        return SignalAttachment.animatedImageUTISet.contains(dataUTI)
+    }
+
     public var isVideo: Bool {
         return SignalAttachment.videoUTISet.contains(dataUTI)
     }