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自定义动画
我们证实了过渡是一种对那些不太好做平滑动画属性的强大工具，但是CATransition的提供的动画类型太少了。
更 奇怪的是苹果通过UIView +transitionFromView:toView:duration:options:completion: 和+transitionWithView:duration:options:animations:方法提供了Core Animation的过渡特性。但是这里的可用的过渡选项和CATransition的type属性提供的常量完全不同。UIView过渡方法中 options参数可以由如下常量指定：
UIViewAnimationOptionTransitionFlipFromLeft UIViewAnimationOptionTransitionFlipFromRightUIViewAnimationOptionTransitionCurlUp UIViewAnimationOptionTransitionCurlDownUIViewAnimationOptionTransitionCrossDissolve UIViewAnimationOptionTransitionFlipFromTop UIViewAnimationOptionTransitionFlipFromBottom@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+ (void)animateWithDuration:(NSTimeInterval)duration delay:(NSTimeInterval)delay options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
参数解析:
duration：动画的持续时间
delay：动画延迟delay秒后开始
options：动画的节奏控制
animations：将改变视图属性的代码放在这个block中
completion：动画结束后，会自动调用这个block
转场动画
+ (void)transitionWithView:(UIView *)view duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options animations:(void (^)(void))animations completion:(void (^)(BOOL finished))completion
参数解析:
duration：动画的持续时间
view：需要进行转场动画的视图
options：转场动画的类型
animations：将改变视图属性的代码放在这个block中
completion：动画结束后，会自动调用这个block
+ (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion
方法调用完毕后，相当于执行了下面两句代码：
// 添加toView到父视图
[fromView.superview addSubview:toView];
// 把fromView从父视图中移除
[fromView.superview removeFromSuperview];
参数解析:
duration：动画的持续时间
options：转场动画的类型
animations：将改变视图属性的代码放在这个block中
completion：动画结束后，会自动调用这个block
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原文地址：http://www.cnblogs.com/jingdizhiwa/p/5504646.html
