Don't animate changes to shape layer properties.

Signal/src/ViewControllers/ConversationView/Cells/OWSBubbleStrokeView.m

@@ -85,19 +85,21 @@ NS_ASSUME_NONNULL_BEGIN
         return;
     }
 
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     // Don't fill the shape layer; we just want a stroke around the border.
     self.shapeLayer.fillColor = [UIColor clearColor].CGColor;
 
+    [CATransaction commit];
+
     self.clipsToBounds = YES;
 
     if (!self.bubbleView) {
         return;
     }
 
-    self.shapeLayer.strokeColor = self.strokeColor.CGColor;
-    self.shapeLayer.lineWidth = self.strokeThickness;
-    self.shapeLayer.zPosition = 100.f;
-
     UIBezierPath *bezierPath = [UIBezierPath new];
 
     UIBezierPath *boundsBezierPath = [UIBezierPath bezierPathWithRect:self.bounds];
@@ -110,7 +112,16 @@ NS_ASSUME_NONNULL_BEGIN
     [bubbleBezierPath applyTransform:transform];
     [bezierPath appendPath:bubbleBezierPath];
 
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
+    self.shapeLayer.strokeColor = self.strokeColor.CGColor;
+    self.shapeLayer.lineWidth = self.strokeThickness;
+    self.shapeLayer.zPosition = 100.f;
     self.shapeLayer.path = bezierPath.CGPath;
+
+    [CATransaction commit];
 }
 
 @end

Signal/src/ViewControllers/ConversationView/Cells/OWSBubbleView.m

@@ -130,7 +130,14 @@ const CGFloat kBubbleTextVInset = 10.f;
     if (!self.shapeLayer) {
         [self updateLayers];
     }
+
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     self.shapeLayer.fillColor = bubbleColor.CGColor;
+
+    [CATransaction commit];
 }
 
 - (void)updateLayers
@@ -144,9 +151,15 @@ const CGFloat kBubbleTextVInset = 10.f;
 
     UIBezierPath *bezierPath = [self maskPath];
 
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     self.shapeLayer.fillColor = self.bubbleColor.CGColor;
     self.shapeLayer.path = bezierPath.CGPath;
     self.maskLayer.path = bezierPath.CGPath;
+
+    [CATransaction commit];
 }
 
 - (UIBezierPath *)maskPath

Signal/src/views/AudioProgressView.swift

@@ -73,6 +73,10 @@ import SignalServiceKit
     internal func updateContent() {
         SwiftAssertIsOnMainThread(#function)
 
+        // Prevent the shape layer from animating changes.
+        CATransaction.begin()
+        CATransaction.setValue(kCFBooleanTrue, forKey: kCATransactionDisableActions)
+
         let horizontalBarPath = UIBezierPath()
         let horizontalBarHeightFraction = CGFloat(0.25)
         let horizontalBarHeight = bounds.size.height * horizontalBarHeightFraction
@@ -89,5 +93,7 @@ import SignalServiceKit
         progressPath.append(UIBezierPath(roundedRect: progressBounds, cornerRadius: progressCornerRadius))
         progressLayer.path = progressPath.cgPath
         progressLayer.fillColor = progressColor.cgColor
+
+        CATransaction.commit()
     }
 }

Signal/src/views/OWSBezierPathView.m

@@ -84,12 +84,18 @@ NS_ASSUME_NONNULL_BEGIN
         [layer removeFromSuperlayer];
     }
 
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     for (ConfigureShapeLayerBlock configureShapeLayerBlock in self.configureShapeLayerBlocks) {
         CAShapeLayer *shapeLayer = [CAShapeLayer new];
         configureShapeLayerBlock(shapeLayer, self.bounds);
         [self.layer addSublayer:shapeLayer];
     }
 
+    [CATransaction commit];
+
     [self setNeedsDisplay];
 }
 

Signal/src/views/OWSProgressView.m

@@ -1,5 +1,5 @@
 //
-//  Copyright (c) 2017 Open Whisper Systems. All rights reserved.
+//  Copyright (c) 2018 Open Whisper Systems. All rights reserved.
 //
 
 #import "OWSProgressView.h"
@@ -43,6 +43,10 @@ NS_ASSUME_NONNULL_BEGIN
     self.backgroundColor = [UIColor clearColor];
     self.color = [UIColor whiteColor];
 
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     self.borderLayer = [CAShapeLayer new];
     self.borderLayer.fillColor = self.color.CGColor;
     [self.layer addSublayer:self.borderLayer];
@@ -51,6 +55,8 @@ NS_ASSUME_NONNULL_BEGIN
     self.progressLayer.fillColor = self.color.CGColor;
     [self.layer addSublayer:self.progressLayer];
 
+    [CATransaction commit];
+
     [self setContentCompressionResistancePriority:UILayoutPriorityDefaultHigh forAxis:UILayoutConstraintAxisVertical];
     [self setContentHuggingPriority:UILayoutPriorityDefaultHigh forAxis:UILayoutConstraintAxisVertical];
 }
@@ -79,6 +85,10 @@ NS_ASSUME_NONNULL_BEGIN
 
 - (void)update
 {
+    // Prevent the shape layer from animating changes.
+    [CATransaction begin];
+    [CATransaction setValue:(id)kCFBooleanTrue forKey:kCATransactionDisableActions];
+
     CGFloat kBorderThickness = self.bounds.size.height * 0.1f;
     CGFloat kOuterRadius = self.bounds.size.height * 0.25f;
     CGFloat kInnerRadius = kOuterRadius - kBorderThickness;
@@ -107,6 +117,8 @@ NS_ASSUME_NONNULL_BEGIN
 
     self.progressLayer.path = progressPath.CGPath;
     self.progressLayer.fillColor = self.color.CGColor;
+
+    [CATransaction commit];
 }
 
 - (CGSize)sizeThatFits:(CGSize)size