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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。
核心动画的层次关系
转场动画(CATransition)
CATransition *animation = [CATransition animation];
animation.type = @"reveal";
animation.duration = 1;
animation.subtype = kCATransitionReveal;
[self.myView.layer addAnimation:animation forKey:nil];
CGPoint point = self.myView.center;
point.y += 150;
[self.myView setCenter:point];
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。
group.animations = [里面放动画对象];
[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]; 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 animateWithDuration:4 animations:^{
CGPoint point = self.myView.center;
point.y += 150;
[self.myView setCenter:point];
}];
[UIView animateKeyframesWithDuration:0.5 delay:1 options:UIViewKeyframeAnimationOptionAutoreverse animations:^{
self.view.bounds = CGRectMake(30, 30, 30, 30);
} completion:^(BOOL finished) {
}];
+ (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
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原文地址：http://www.cnblogs.com/superYou/p/4634422.html
