在iOS中，动画实现方向有两种，一种是操作UIView的animation方法，另外一种就是核心动画，但到iOS7中，UIView又跟核心动画牵扯在一起。   方式一（利用核心动画添加动画） 核心动画的层次关系       转场动画(CATransition)   用于做场景的转换动画，能偶为层提供移出屏幕和一如屏幕的动画效果。 UINavigationController就是通过CATransition实现了讲控制器的师徒推入屏幕的动画效果。 常用属性 type动画过度类型 subtype:动画过度方向 startProgress:动画起点(在整体的百分比)(可用的值从0到1，在动画中起点或终点的逗留时间，开始的时间一定要比结束的时间小，下同) endProgress:动画终点(在整体动画的百分比)  

CABasicAnimation *baseAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
baseAnimation.fromValue = [NSValue valueWithCGRect:CGRectMake(20, 20, 100, 100)];
baseAnimation.toValue = [NSValue valueWithCGRect:CGRectMake(100, 100, 200, 200)];
baseAnimation.duration = 2.0;
baseAnimation.removedOnCompletion = NO;
baseAnimation.fillMode = kCAFillModeForwards;
baseAnimation.repeatCount = MAXFLOAT;
[self.myView.layer addAnimation:baseAnimation forKey:nil];

 

  基本动画(CABasicAnimation),是CAPropertyAnimation的子类,一个动画可控制一个属性的变化，变化值只能是两个值中变化，可以在fromValue和toValue两个值中设置    

CABasicAnimation *baseAnimation = [CABasicAnimation animationWithKeyPath:@"bounds"];
baseAnimation.fromValue = [NSValue valueWithCGRect:CGRectMake(20, 20, 100, 100)];
baseAnimation.toValue = [NSValue valueWithCGRect:CGRectMake(100, 100, 200, 200)];
baseAnimation.duration = 2.0;
baseAnimation.removedOnCompletion = NO;
baseAnimation.fillMode = kCAFillModeForwards;
baseAnimation.repeatCount = MAXFLOAT;
[self.myView.layer addAnimation:baseAnimation forKey:nil];

 

    帧动画(CAKeyframeAnimation)，帧动画也是CAPropertyAnimation的子类，所以也是控制一个view的属性做动画，与CABaseAnimation不同的是，CAKeyFrameAnimation可以添加多个关键帧，而CABaseAnimation可以看做是两个关键帧的帧动画，我们可以好好利用帧动画的关键帧来做比较有趣的动画，如泡泡效果。    

CAAnimationGroup *group = [[CAAnimationGroup alloc] init];
// 位移 CAKeyframeAnimation *positionAnima = [CAKeyframeAnimation animationWithKeyPath:@"position"];
positionAnima.calculationMode = kCAAnimationCubicPaced;
positionAnima.duration = 5;
positionAnima.fillMode = kCAFillModeForwards;
positionAnima.removedOnCompletion = NO;
positionAnima.repeatCount = MAXFLOAT;
positionAnima.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionLinear];
// 添加移动路径 CGMutablePathRef curvedPath = CGPathCreateMutable();
CGRect circleContainer = CGRectInset(myView.frame, myView.frame.size.width / 2 - 3, myView.frame.size.height / 2 - 3);
CGPathAddEllipseInRect(curvedPath, NULL, circleContainer);
positionAnima.path = curvedPath;
CGPathRelease(curvedPath);
[myView.layer addAnimation:positionAnima forKey:nil];
// 缩放X CAKeyframeAnimation *scaleX = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.x"];
scaleX.duration = 1.0;
scaleX.values = @[@1.0,@1.1,@1.0];
scaleX.keyTimes = @[@0.0,@0.5,@1.0];
scaleX.repeatCount = MAXFLOAT;
scaleX.autoreverses = YES;
scaleX.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
[myView.layer addAnimation:scaleX forKey:nil];
// 缩放Y CAKeyframeAnimation *scaleY = [CAKeyframeAnimation animationWithKeyPath:@"transform.scale.y"];
scaleY.duration = 1.5;
scaleY.values = @[@1.0,@1.1,@1.0];
scaleY.keyTimes = @[@0.0,@0.5,@1.0];
scaleY.repeatCount = MAXFLOAT;
scaleY.autoreverses = YES;
group.animations = @[positionAnima,scaleX,scaleY];
scaleY.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];
[myView.layer addAnimation:scaleY forKey:nil];

 

运行效果   由于本人的电脑是黑苹果，所以将就一下啦，哈哈，白苹果应该不会这样的。   动画组(CAAnimationGroup)CAAnimation的子类，可以保存一组动画对象，讲CAAnimationGroup对象加入层后，组中所有动画可以同时运行，所以，当我们需要做多个动画并且执行的时间不一样的时候，动画组就不适用。例如上面的泡泡效果。 group.animations = [里面放动画对象];     方式二（利用UIView添加动画） UIView动画(手码) 添加单个动画  

[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:4];
CGPoint point = self.myView.center;
point.y += 150;
[self.myView setCenter:point];
[UIView commitAnimations];

 

    添加多个动画  

　　[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:4];
CGPoint point = self.myView.center;
point.y += 150;
[self.myView setCenter:point];
[UIView commitAnimations];
[UIView beginAnimations:nil context:nil];
[UIView setAnimationDuration:4];
[self.myView setAlpha:0.1];
[UIView commitAnimations];

 

  UIView动画(Block) [UIView animateWithDuration:4 animations:^{         CGPoint point = self.myView.center;         point.y += 150;         [self.myView setCenter:point];     }];     UIView动画(Block帧动画),从iOS7开启，苹果提供了比较便捷的方法来调用帧动画，不用新建帧动画实例，直接对layer的属性进行控制。  

[UIView animateKeyframesWithDuration:0.5 delay:1 options:UIViewKeyframeAnimationOptionAutoreverse animations:^{
self.view.bounds = CGRectMake(30, 30, 30, 30);
}
completion:^(BOOL finished) {
}
];

 

UIView转场动画。 + (void)transitionFromView:(UIView *)fromView toView:(UIView *)toView duration:(NSTimeInterval)duration options:(UIViewAnimationOptions)options completion:(void (^)(BOOL finished))completion     这个方法应该不好理解，简单来说，这个方法调用完毕后，相当于执行了两句代码，    

// 添加toView到父视图[fromView.superview addSubview:toView];
// 把fromView从父视图中移除[fromView.superview removeFromSuperview];
- duration：动画的持续时间- 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