CoreAnimation 细说动画（二）

UIView 过渡

使用的API：setAnimationTransition:forView:cache: 参数为：一个过渡类型，要进行过渡操作的组件的父视图，一个Boolean值用于描述是否在动画之前和之后需要Core Animation进行缓存，缓存可以提升Core Animation的性能。

4种效果：

UIViewAnimationTransitionFlipFromRight 视图内容从右向左翻转，展现屏幕背面的另外一个视图。
UIViewAnimationTransitionFlipFromLeft 视图内容从左向右翻转，展现屏幕背面的另外一个视图。
UIViewAnimationTransitionCurlUp 视图翻卷起来。
UIViewAnimationTransitionCurlDown 显示和覆盖当前视图。

看下面的例子和图示：

- (void)viewDidLoad
{
    [super viewDidLoad];
 
    UIView *animationView = [[UIView alloc] init];
    animationView.backgroundColor = [UIColor redColor];
    [self.view addSubview:animationView];
    animationView.tag = 100;
    animationView.transform = CGAffineTransformIdentity;
    animationView.frame = self.view.frame;
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 100, 50);
    [btn setTitle:@"点击看动画" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(theAnimationShow) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
 
    // Do any additional setup after loading the view, typically from a nib.
 
 
}
 
- (void)theAnimationShow
{
    UIView *animationView = [self.view viewWithTag:100];
 
    [UIView beginAnimations:@"ViewAnimationOne" context:nil];
    [UIView setAnimationCurve:UIViewAnimationCurveEaseIn];
    [UIView setAnimationDuration:1];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(theAnimationStop:finish:context:)];
    [UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:animationView cache:YES];
    [UIView commitAnimations];
}

效果图：

其它的效果只需要替换上面代码中
[UIView setAnimationTransition:UIViewAnimationTransitionFlipFromRight forView:animationView cache:YES];的UIViewAnimationTransitionFlipFromRight 过渡样式即可。

按照上面介绍的顺序效果依次为：

以上图是我用模拟器截的 有的可能存在一些问题，大概是个意思….

连续变化的Core Animation层

动画有隐式和显示之分。隐式动画指的是，无须创建动画对象，只需改变动画层的属性，让核心动画自己去完成动画效果。显示动画指的是，需要自己创建和管理动画对象，并且将它们应用到动画层，才能显示动画效果。

额，关于隐式动画，由于其持续的时间比较短，几乎是看不出来的，如果要达到明显的动画效果,就需要显式的调用动画。

这里介绍下显示动画：层过渡动画

kCATransitionFade 淡入或淡出层内容，使得内容变的可见或隐藏。
kCATransitionMoveIn 要显示的层滑过底下的层
kCATransitionPush 要显示的层滑入屏幕的时候将底下的层推出屏幕
kCATransitionReveal 要显示的层渐渐显示出来，覆盖底下的层

由于要对层(layer)进行动画操作,所以需要添加QuartzCode.framework框架，并导入头文件#import

具体的操作效果看下面代码：

- (void)viewDidLoad
{
    [super viewDidLoad];
 
    self.view.backgroundColor = [UIColor redColor];
 
    UIView *layerView = [[UIView alloc] initWithFrame:self.view.frame]; 
    [layerView setBackgroundColor:[UIColor orangeColor]];
    layerView.tag = 100;
    [self.view addSubview:layerView];
    [layerView release];
 
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 120, 50);
    [btn setTitle:@"点击查看动画" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(theAnimtaionBegin) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
 
	// Do any additional setup after loading the view, typically from a nib.
}
 
- (void)theAnimtaionBegin
{
    UIView *layerView = [self.view viewWithTag:100];
    CATransition *transition= [CATransition animation];
    transition.duration = 1.0;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
    transition.delegate = self;
    transition.type = kCATransitionFade;  //过渡类型，淡入或淡出
    [layerView.layer addAnimation:transition forKey:@"transtionone"];
    layerView.alpha = 0.0;
}
 
- (void)animationDidStop:(CAAnimation *)anim finished:(BOOL)flag
{
    NSLog(@"....stop.....");
}

从上面的代码能正常运行，就可以发现，在Core Animation动画中，代理方法不需要设置选择器

移入、推出和显示

- (void)viewDidLoad
{
    [super viewDidLoad];
 
    self.view.backgroundColor = [UIColor redColor];
 
    UIView *layerView = [[UIView alloc] initWithFrame:self.view.frame]; 
    [layerView setBackgroundColor:[UIColor orangeColor]];
    layerView.tag = 100;
    [self.view addSubview:layerView];
    [layerView release];
 
    UIButton *btn = [UIButton buttonWithType:UIButtonTypeCustom];
    btn.frame = CGRectMake(100, 100, 120, 50);
    [btn setTitle:@"点击查看动画" forState:UIControlStateNormal];
    [btn addTarget:self action:@selector(theAnimtaionBegin) forControlEvents:UIControlEventTouchUpInside];
    [self.view addSubview:btn];
 
	// Do any additional setup after loading the view, typically from a nib.
}
 
- (void)theAnimtaionBegin
{
    UIView *layerView = [self.view viewWithTag:100];
    CATransition *transition= [CATransition animation];
    transition.duration = 1.0;
    transition.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];
    transition.delegate = self;
    transition.type = kCATransitionReveal;
    transition.subtype = kCATransitionFromTop;  //过渡方向
    [layerView.layer addAnimation:transition forKey:@"transtionone"];
    layerView.hidden = YES;
}

主要
transition.type = kCATransitionReveal;
transition.subtype = kCATransitionFromTop; //过渡方向

改变这两个的属性即可。

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