CAAnimation(抽象)
     

QuartzCore框架的基本继承结构 　　　　　　　　　　　->　CATransition

CAAnimation(抽象)　->　CAPropertyAnimation　->　CABasicAnimation 　　　　　　　　　　　　　　　　　　　　　　　　  ->  CAKeyframeAnimation 　　　　　　　　　　 ->　CAAnimationGroup

//渐变    UIButton *b = (UIButton *)sender;    CATransition *transition = [CATransition animation];    transition.type = kCATransitionPush;    transition.subtype = kCATransitionFromRight;    [self.imageview.layer addAnimation:transition forKey:@"transition"];    self.imageview.image = [UIImage imageNamed:@"avatar.jpg"];        //基本    CABasicAnimation *baseProperty = [CABasicAnimation animationWithKeyPath:@"transform.scale"];    baseProperty.fromValue = [NSNumber numberWithDouble:1.0];    baseProperty.toValue = [NSNumber numberWithDouble:0.4];    baseProperty.duration = 1.0;    baseProperty.removedOnCompletion = NO;    baseProperty.fillMode = kCAFillModeForwards;    baseProperty.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];    [self.imageview.layer addAnimation:baseProperty forKey:@"baseProperty"];        //关键帧    //动画组    CAKeyframeAnimation *keyFrameAniamtion = [CAKeyframeAnimation animationWithKeyPath:@"position"];        CGMutablePathRef mutablePath = CGPathCreateMutable();    CGPathMoveToPoint(mutablePath, NULL, self.imageview.frame.origin.x, self.imageview.frame.origin.y);    CGPathAddLineToPoint(mutablePath, NULL, 0, 0);    keyFrameAniamtion.path = mutablePath;        keyFrameAniamtion.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut];        CAKeyframeAnimation *keyframe2 = [CAKeyframeAnimation animationWithKeyPath:@"transform.rotation"];    NSArray *values2 = [NSArray arrayWithObjects:[NSNumber numberWithFloat:0], [NSNumber numberWithFloat:(M_PI * 10)], nil];    keyframe2.values = values2;    keyframe2.timingFunction = [CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseIn];    CAAnimationGroup *group = [CAAnimationGroup animation];    group.removedOnCompletion = NO;    group.fillMode = kCAFillModeForwards;    group.animations = [NSArray arrayWithObjects:keyFrameAniamtion, keyframe2, nil];    group.duration = 2.0;    [self.imageview.layer addAnimation:group forKey:@"group"];