[iOS Animation]-CALayer 显示动画 对图层树的动画

#import "AppDelegate.h" #import "FirstViewController.h" #import "SecondViewController.h" #import <QuartzCore/QuartzCore.h> @implementation AppDelegate - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
    self.window = [[UIWindow alloc] initWithFrame: [[UIScreen mainScreen] bounds]];
    UIViewController *viewController1 = [[FirstViewController alloc] init];
    UIViewController *viewController2 = [[SecondViewController alloc] init];
    self.tabBarController = [[UITabBarController alloc] init];
    self.tabBarController.viewControllers = @[viewController1, viewController2];
    self.tabBarController.delegate = self;
    self.window.rootViewController = self.tabBarController;
    [self.window makeKeyAndVisible]; return YES;
} - (void)tabBarController:(UITabBarController *)tabBarController didSelectViewController:(UIViewController *)viewController
{
    ?//set up crossfade transition CATransition *transition = [CATransition animation];
    transition.type = kCATransitionFade; //apply transition to tab bar controller‘s view  [self.tabBarController.view.layer addAnimation:transition forKey:nil];
} @end

@interface ViewController ()
@property (nonatomic, weak) IBOutlet UIImageView *imageView;
@property (nonatomic, copy) NSArray *images; @end @implementation ViewController - (void)viewDidLoad
{
    [super viewDidLoad]; //set up images self.images = @[[UIImage imageNamed:@"Anchor.png"],
                    [UIImage imageNamed:@"Cone.png"],
                    [UIImage imageNamed:@"Igloo.png"],
                    [UIImage imageNamed:@"Spaceship.png"]]; - (IBAction)switchImage
{
    [UIView transitionWithView:self.imageView duration:1.0 options:UIViewAnimationOptionTransitionFlipFromLeft
                    animations:^{ //cycle to next image UIImage *currentImage = self.imageView.image;
                        NSUInteger index = [self.images indexOfObject:currentImage];
                        index = (index + 1) % [self.images count];
                        self.imageView.image = self.images[index];
                    }
                    completion:NULL];
} @end

@implementation ViewController - (IBAction)performTransition
{ //preserve the current view snapshot UIGraphicsBeginImageContextWithOptions(self.view.bounds.size, YES, 0.0);
    [self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
    UIImage *coverImage = UIGraphicsGetImageFromCurrentImageContext(); //insert snapshot view in front of this one UIView *coverView = [[UIImageView alloc] initWithImage:coverImage];
    coverView.frame = self.view.bounds;
    [self.view addSubview:coverView]; //update the view (we‘ll simply randomize the layer background color) CGFloat red = arc4random() / (CGFloat)INT_MAX;
    CGFloat green = arc4random() / (CGFloat)INT_MAX;
    CGFloat blue = arc4random() / (CGFloat)INT_MAX;
    self.view.backgroundColor = [UIColor colorWithRed:red green:green blue:blue alpha:1.0]; //perform animation (anything you like) [UIView animateWithDuration:1.0 animations:^{ //scale, rotate and fade the view CGAffineTransform transform = CGAffineTransformMakeScale(0.01, 0.01);
        transform = CGAffineTransformRotate(transform, M_PI_2);
        coverView.transform = transform;
        coverView.alpha = 0.0;
    } completion:^(BOOL finished) { //remove the cover view now we‘re finished with it  [coverView removeFromSuperview];
    }];
} @end

@interface ViewController ()

@property (nonatomic, weak) IBOutlet UIView *containerView;
@property (nonatomic, strong) CALayer *shipLayer; @end @implementation ViewController - (void)viewDidLoad
{
    [super viewDidLoad]; //add the ship self.shipLayer = [CALayer layer];
    self.shipLayer.frame = CGRectMake(0, 0, 128, 128);
    self.shipLayer.position = CGPointMake(150, 150);
    self.shipLayer.contents = (__bridge id)[UIImage imageNamed: @"Ship.png"].CGImage;
    [self.containerView.layer addSublayer:self.shipLayer];
} - (IBAction)start
{ //animate the ship rotation CABasicAnimation *animation = [CABasicAnimation animation];
    animation.keyPath = @"transform.rotation";
    animation.duration = 2.0;
    animation.byValue = @(M_PI * 2);
    animation.delegate = self;
    [self.shipLayer addAnimation:animation forKey:@"rotateAnimation"];
} - (IBAction)stop
{
    [self.shipLayer removeAnimationForKey:@"rotateAnimation"];
} - (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{ //log that the animation stopped NSLog(@"The animation stopped (finished: %@)", flag? @"YES": @"NO");
} @end