（抄）iOS实现动画的几种常见方式

http://www.devqinwei.com/2015/10/15/ios实现动画的几种常见方式/

1. 使用CALayer的基本关键帧动画CABasicAnimation和CAKeyframeAnimation

特点：可做3D动画

详细介绍可参看两个帖子：

http://blog.csdn.net/iosevanhuang/article/details/14488239

http://blog.csdn.net/wscqqlucy/article/details/8669636

注：( CGAffineTransform 和 CATransform3D 的比较 )

CGAffineTransform is used for 2-D manipulation of NSViews, UIViews, and other 2-D Core Graphics elements.

CATransform3D is a Core Animation structure that can do more complex 3-D manipulations of CALayers.( 搬运from stackOverFlow)

如：(CABasicAnimation)

CABasicAnimation* animation = [CABasicAnimation animationWithKeyPath:@"transform.rotation.y"];

animation.fromValue = @(0);

animation.toValue = @(-M_PI);

animation.repeatCount = 0;

animation.duration = 0.4;

[aView.layer addAnimation:animation forKey:@"rotation"];

CATransform3D transform = CATransform3DIdentity;

transform.m34 = 1.0 / 500.0;

aView.layer.transform = transform;

如：(CAKeyframeAnimation)

CAKeyframeAnimation *keyFrameAnimation = [CAKeyframeAnimation animationWithKeyPath:@"bounds"];

keyFrameAnimation.delegate = self;

keyFrameAnimation.duration = 1.0f;

keyFrameAnimation.beginTime = CACurrentMediaTime() + 1.0f;

NSValue *initialBounds = [NSValue valueWithCGRect: self.navigationController.view.layer.mask.bounds];

NSValue *secondBounds = [NSValue valueWithCGRect:CGRectMake(0.0f, 0.0f, self.navigationController.view.layer.mask.bounds.size.width - 40.0f , self.navigationController.view.layer.mask.bounds.size.height - 40.0f)];

NSValue *finalBounds = [NSValue valueWithCGRect:CGRectMake(0.0f, 0.0f, 2000.0f, 2000.0f)];

keyFrameAnimation.values = @[initialBounds,secondBounds,finalBounds];

keyFrameAnimation.keyTimes = @[@0, @0.5, @1];

keyFrameAnimation.timingFunctions = @[[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut],[CAMediaTimingFunction functionWithName:kCAMediaTimingFunctionEaseOut] ];

keyFrameAnimation.removedOnCompletion = NO;

keyFrameAnimation.fillMode = kCAFillModeForwards;

[self.navigationController.view.layer.mask addAnimation:keyFrameAnimation forKey:@"maskAnimation"];

2. 使用CALayer的事务类CATransaction来执行

CATransaction动画包含显示动画和隐式动画两种。（显示能控制动画中更多方面）

隐式动画：

//设置变化动画过程是否显示，默认为YES不显示

[CATransaction setDisableActions:NO];

//设置圆角

self.layer.cornerRadius = (self.layer.cornerRadius == 0.0f) ? 30.0f : 0.0f;

//设置透明度

self.layer.opacity = (self.layer.opacity == 1.0f) ? 0.5f : 1.0f;

显示动画：

//修改执行时间

[CATransaction begin];

//显式事务默认开启动画效果,kCFBooleanTrue关闭

[CATransaction setValue:(id)kCFBooleanFalse

forKey:kCATransactionDisableActions];

//动画执行时间

[CATransaction setValue:[NSNumber numberWithFloat:5.0f] forKey:kCATransactionAnimationDuration];

//[CATransaction setAnimationDuration:[NSNumber numberWithFloat:5.0f]];

self.layer.cornerRadius = (self.layer.cornerRadius == 0.0f) ? 30.0f : 0.0f;

self.layer.opacity = (self.layer.opacity == 1.0f) ? 0.5f : 1.0f;

[CATransaction commit];

另外，CATransaction来可以用来设置嵌套动画，即先执行A动画，再执行B动画，再执行C动画…（这里不做举例）

（例子来源于：http://www.cnblogs.com/bandy/archive/2012/03/26/2418165.html）

3. 使用UIView关键帧动画animateKeyframesWithDuration

如：

[UIView animateKeyframesWithDuration:durationTime delay:0 options:0 animations:^{

[UIView addKeyframeWithRelativeStartTime:0*frameDuration relativeDuration:1*frameDuration animations:^{

self.pickGradeView.transform = CGAffineTransformMakeScale(0.01, 0.01);

}];

[UIView addKeyframeWithRelativeStartTime:1*frameDuration relativeDuration:1*frameDuration animations:^{

self.pickGradeView.alpha = 1.0;

}];} completion:^(BOOL finished) {

}];

4.使用UIView animateWithDuration

如：

[UIView animateWithDuration:1.0 delay:0.0 usingSpringWithDamping:1.0 initialSpringVelocity:0.5 options:0 animations:^{

self.shortNameLabel.transform = CGAffineTransformMakeScale(0.8, 0.8);

} completion:^(BOOL finished) {

[UIView animateWithDuration:0.4 delay:0.0 usingSpringWithDamping:0.5 initialSpringVelocity:0.5 options:0 animations:^{

self.shortNameLabel.transform = CGAffineTransformMakeScale(1.0, 1.0);

} completion:nil];

}];