ios layer 动画－（transform.scale篇）

x轴缩放：

CABasicAnimation *theAnimation;

theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale.x"];

theAnimation.duration=8;

theAnimation.removedOnCompletion = YES;

theAnimation.fromValue = [NSNumber numberWithFloat:1];

theAnimation.toValue = [NSNumber numberWithFloat:0.5];

[yourView.layer addAnimation:theAnimation forKey:@"animateTransform"];

y轴缩放：

CABasicAnimation *theAnimation;

theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale.y"];

theAnimation.duration=8;

theAnimation.removedOnCompletion = YES;

theAnimation.fromValue = [NSNumber numberWithFloat:1];

theAnimation.toValue = [NSNumber numberWithFloat:0.5];

[yourView.layer addAnimation:theAnimation forKey:@"animateTransform"];

x轴，y轴同时按比例缩放：

CABasicAnimation *theAnimation;

theAnimation=[CABasicAnimation animationWithKeyPath:@"transform.scale"];

theAnimation.duration=8;

theAnimation.removedOnCompletion = YES;

theAnimation.fromValue = [NSNumber numberWithFloat:1];

theAnimation.toValue = [NSNumber numberWithFloat:0.5];

[yourView.layer addAnimation:theAnimation forKey:@"animateTransform"];

以上缩放是以view的中心点为中心缩放的，如果需要自定义缩放点，可以设置卯点：

//中心点

[yourView.layer setAnchorPoint:CGPointMake(0.5, 0.5)];

//左上角

[yourView.layer setAnchorPoint:CGPointMake(0, 0)];

//右下角

[yourView.layer setAnchorPoint:CGPointMake(1, 1)];