学习 CALayer实现，界限、透明度、位置、旋转、缩放组合动画_

首先引入框架：QuartzCore.framework

在头文件声明：CALayer*logoLayer

{

//界限

CABasicAnimation*boundsAnimation =[CABasicAnimationanimationWithKeyPath:@"bounds"];

boundsAnimation.fromValue=[NSValuevalueWithCGRect:logoLayer.bounds];

boundsAnimation.toValue=[NSValuevalueWithCGRect:CGRectZero];

//透明度变化

CABasicAnimation*opacityAnimation =[CABasicAnimationanimationWithKeyPath:@"opacity"];

opacityAnimation.fromValue=[NSNumbernumberWithFloat:1.0];

opacityAnimation.toValue=[NSNumbernumberWithFloat:0.5];

//位置移动

CABasicAnimation*animation =[CABasicAnimationanimationWithKeyPath:@"position"];

animation.fromValue=[NSValuevalueWithCGPoint:logoLayer.position];

CGPointtoPoint=logoLayer.position;

toPoint.x+=180;

animation.toValue=[NSValuevalueWithCGPoint:toPoint];

//旋转动画

CABasicAnimation* rotationAnimation =

[CABasicAnimationanimationWithKeyPath:@"transform.rotation.z"];//"z"还可以是“x”“y”，表示沿z轴旋转

rotationAnimation.toValue=[NSNumbernumberWithFloat:(2*M_PI)*3];

//3 is the number of 360 degree rotations

//Make the rotation animation duration slightly less than the otheranimations to give it the feel

//that it pauses at its largest scale value

rotationAnimation.duration=2.0f;

rotationAnimation.timingFunction=[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];//缓入缓出

//缩放动画

CABasicAnimation*scaleAnimation =[CABasicAnimationanimationWithKeyPath:@"transform.scale"];

scaleAnimation.fromValue=[NSNumbernumberWithFloat:0.0];

scaleAnimation.toValue=[NSNumbernumberWithFloat:1.0];

scaleAnimation.duration=2.0f;

scaleAnimation.timingFunction=[CAMediaTimingFunctionfunctionWithName:kCAMediaTimingFunctionEaseInEaseOut];

CAAnimationGroup*animationGroup =[CAAnimationGroupanimation];

animationGroup.duration=2.0f;

animationGroup.autoreverses=YES;//是否重播，原动画的倒播

animationGroup.repeatCount=NSNotFound;//HUGE_VALF;//HUGE_VALF,源自math.h

[animationGroupsetAnimations:[NSArrayarrayWithObjects:rotationAnimation,scaleAnimation,nil]];

//将上述两个动画编组

[logoLayeraddAnimation:animationGroupforKey:@"animationGroup"];

}

//去掉所有动画

[logoLayerremoveAllAnimations];

//去掉key动画

[logoLayerremoveAnimationForKey:@"animationGroup"];

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