StackOverflow - how to synchronize CALayer and UIView animations

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AnimatedLayers-Info.plist

<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
<plist version="1.0">
<dict>

    <key>CFBundleIdentifier</key>
    <string>com.epologee.${PRODUCT_NAME:rfc1034identifier}</string>

    <key>CFBundleDevelopmentRegion</key>
    <string>en</string>
    <key>CFBundleExecutable</key>
    <string>${EXECUTABLE_NAME}</string>
    <key>CFBundleInfoDictionaryVersion</key>
    <string>6.0</string>
    <key>CFBundleName</key>
    <string>${PRODUCT_NAME}</string>
    <key>CFBundlePackageType</key>
    <string>APPL</string>
    <key>CFBundleSignature</key>
    <string>????</string>

    <key>CFBundleDisplayName</key>
    <string>${PRODUCT_NAME}</string>
    <key>CFBundleVersion</key>
    <string>1.0</string>
    <key>CFBundleShortVersionString</key>
    <string>1.0</string>
    <key>LSRequiresIPhoneOS</key>
    <true/>
    <key>UIRequiredDeviceCapabilities</key>
    <array>
    	<string>armv7</string>
    </array>
    <key>UISupportedInterfaceOrientations</key>
    <array>
         <string>UIInterfaceOrientationPortrait</string>
         <string>UIInterfaceOrientationLandscapeLeft</string>
         <string>UIInterfaceOrientationLandscapeRight</string>
    </array>
</dict>
</plist>

AnimatedLayers-Prefix.pch

#import <Availability.h>

#ifndef __IPHONE_3_0
#warning "This project uses features only available in iOS SDK 3.0 and later."
#endif

#ifdef __OBJC__
    #import <UIKit/UIKit.h>

    #import <Foundation/Foundation.h>

#endif

AnimatedLayers.xcscheme

<?xml version="1.0" encoding="UTF-8"?>
<Scheme
   version = "1.3">
   <BuildAction>
      <BuildActionEntries>
         <BuildActionEntry
            buildForRunning = "YES">
            <BuildableReference
               BuildableIdentifier = "primary"
               BlueprintIdentifier = "8215700D754C2F15E43C8A3B"
               BuildableName = "AnimatedLayers.app"
               BlueprintName = "AnimatedLayers"
               ReferencedContainer = "container:AnimatedLayers.xcodeproj">
            </BuildableReference>
         </BuildActionEntry>
      </BuildActionEntries>
   </BuildAction>
   <LaunchAction
      selectedDebuggerIdentifier = "Xcode.DebuggerFoundation.Debugger.GDB"
      selectedLauncherIdentifier = "Xcode.DebuggerFoundation.Launcher.GDB"
      useCustomWorkingDirectory = "NO"
      buildConfiguration = "Debug">
      <BuildableProductRunnable>
         <BuildableReference
            BuildableIdentifier = "primary"
            BlueprintIdentifier = "8215700D754C2F15E43C8A3B"
            BuildableName = "AnimatedLayers.app"
            BlueprintName = "AnimatedLayers"
            ReferencedContainer = "container:AnimatedLayers.xcodeproj">
         </BuildableReference>
      </BuildableProductRunnable>
   </LaunchAction>
</Scheme>

AppDelegate.h

#import <UIKit/UIKit.h>

@interface AppDelegate : UIResponder <UIApplicationDelegate>
@end

AppDelegate.m

#import "AppDelegate.h"
#import "JustAViewController.h"

@implementation AppDelegate
{
    UIWindow *_window;
    UINavigationController *_navigationController;
}

@synthesize window = _window;


- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    _window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];

    JustAViewController *vc = [[JustAViewController alloc] init];
    vc.title = @"Synchronize the squares?";

    _navigationController = [[UINavigationController alloc] initWithRootViewController:vc];
    _navigationController.navigationBar.tintColor = [UIColor blackColor];

    [_window addSubview:_navigationController.view];

    _window.backgroundColor = [UIColor whiteColor];
    [_window makeKeyAndVisible];

    return YES;
}

@end

ContainerView.h

#import <Foundation/Foundation.h>

@interface ContainerView : UIView
@end

ContainerView.m

#import <QuartzCore/QuartzCore.h>
#import "ContainerView.h"

@implementation ContainerView
{
    UIView *_subview;
    CALayer *_sublayer;
}

- (id)initWithFrame:(CGRect)frame
{
    self = [super initWithFrame:frame];

    if (self)
    {
        self.backgroundColor = [UIColor whiteColor];

        /*
        The 'subview' (emphasis on *view*) is a UIView instance. It is colored blue.
         */
        _subview = [[UIView alloc] initWithFrame:[self frameForSubview]];
        _subview.backgroundColor = [UIColor blueColor];
        [self addSubview:_subview];

        /*
        The 'sublayer' (emphasis on *layer*) is a CALayer instance. It is colored red.
         */
        _sublayer = [CALayer layer];
        _sublayer.backgroundColor = [UIColor redColor].CGColor;
        [self.layer addSublayer:_sublayer];
    }

    return self;
}

- (CGRect)frameForSubview
{
    return CGRectMake(self.bounds.size.width - 22, self.bounds.size.height - 22, 22, 22);
}

- (CGRect)frameForSublayer
{
    return CGRectMake(self.bounds.size.width - 44, self.bounds.size.height - 44, 22, 22);
}

/**
* I'm using the setFrame: method to set the frames of the subview and the sublayers to make sure that
* a possible enclosing `UIView animateWithDuration:animations:` call is not violated.
* Setting an autoresizingMask on the `UIView *_subview` would have achieved the same effect, but there
* is no such property on `CALayer *_sublayer`.
*/
- (void)setFrame:(CGRect)aFrame
{
    [super setFrame:aFrame];

    _subview.frame = [self frameForSubview];
    _sublayer.frame = [self frameForSublayer];
}

@end

InfoPlist.strings

/* Localized versions of Info.plist keys */

JustAViewController.h

#import <Foundation/Foundation.h>

@interface JustAViewController : UIViewController
@end

JustAViewController.m

#import "JustAViewController.h"
#import "ContainerView.h"

@implementation JustAViewController
{
    ContainerView *_containerView;
}

/**
* Most of this loadView method is not too interesting.
* The `ContainerView` instance added as a subview is the class that this project is about.
*/
- (void)loadView
{
    self.view = [[UIView alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
    self.view.backgroundColor = [UIColor colorWithWhite:0.9 alpha:1];
    [self.view addGestureRecognizer:[[UITapGestureRecognizer alloc] initWithTarget:self action:@selector(handleTap)]];

    // The autoresizingMask is only of use the very first time this view controller's view is added to the window.
    _containerView = [[ContainerView alloc] initWithFrame:CGRectMake(20, 20, self.view.bounds.size.width - 40, self.view.bounds.size.height / 2 - 20)];
    _containerView.autoresizingMask = UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
    [self.view addSubview:_containerView];

    UILabel *hint = [[UILabel alloc] initWithFrame:CGRectMake(20, self.view.bounds.size.height / 2 + 20, self.view.bounds.size.width - 40, self.view.bounds.size.height / 2 - 40)];
    hint.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;
    hint.text = @"Tap anywhere to trigger the frame change animation.\n\nThe red square is a (CALayer) sublayer, the blue square is a (UIView) subview.\n\nThe animation duration of either 0.0s or 1.0s is picked randomly";
    hint.lineBreakMode = UILineBreakModeWordWrap;
    hint.numberOfLines = 0;
    hint.backgroundColor = [UIColor clearColor];
    [self.view addSubview:hint];
}

- (void)handleTap
{
    // This just creates a random frame in the upper half of this view controller's view bounds.
    CGRect maxFrame = CGRectMake(20, 20, self.view.bounds.size.width - 40, self.view.bounds.size.height / 2 - 20);
    CGRect subFrame = CGRectMake(20, 20, MAX(44, arc4random() % (NSInteger)maxFrame.size.width), MAX(44, arc4random() % (NSInteger)(maxFrame.size.height / 2)));
    subFrame.origin.x = 20 + arc4random() % (NSInteger)(maxFrame.size.width - subFrame.size.width);
    subFrame.origin.y = 20 + arc4random() % (NSInteger)(maxFrame.size.height - subFrame.size.height);

    // Assign that sub frame to the container view in an animation block. The duration is either 0.0s (instant) or 1.0s (slow animation).
    // The red square within does not regard this duration, so regardless of the duration it's either always too late or always too soon.
    [UIView animateWithDuration:arc4random() % 2 delay:0 options:UIViewAnimationCurveEaseOut | UIViewAnimationOptionAllowUserInteraction | UIViewAnimationOptionBeginFromCurrentState animations:^{
        _containerView.frame = subFrame;
    } completion:nil];
}

@end

main.m

#import "AppDelegate.h"

int main(int argc, char *argv[])
{
    @autoreleasepool {
        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

project.pbxproj

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