iOS之按钮出现时加一个动画效果

//按钮出现时的动画效果

+ (void)buttonAnimation:(UIButton *)sender {

CAKeyframeAnimation *animation = [CAKeyframeAnimation animationWithKeyPath:@"transform"];

CATransform3D scale1 = CATransform3DMakeScale(0.5, 0.5, 1);

CATransform3D scale2 = CATransform3DMakeScale(1.2, 1.2, 1);

CATransform3D scale3 = CATransform3DMakeScale(0.9, 0.9, 1);

CATransform3D scale4 = CATransform3DMakeScale(1.0, 1.0, 1);

NSArray *frameValues = [NSArray arrayWithObjects:

[NSValue valueWithCATransform3D:scale1],

[NSValue valueWithCATransform3D:scale2],

[NSValue valueWithCATransform3D:scale3],

[NSValue valueWithCATransform3D:scale4],

nil];

[animation setValues:frameValues];

NSArray *frameTimes = [NSArray arrayWithObjects:

[NSNumber numberWithFloat:0.0],

[NSNumber numberWithFloat:0.5],

[NSNumber numberWithFloat:0.9],

[NSNumber numberWithFloat:1.0],

nil];

[animation setKeyTimes:frameTimes];

animation.fillMode = kCAFillModeForwards;

animation.duration = 0.3f;

[sender.layer addAnimation:animation forKey:@"DSPopUpAnimation"];

}