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

animation.toValue = @2.0f; //放大倍數(shù)

animation.duration = 0.5f;//動(dòng)畫時(shí)間

animation.autoreverses = NO;

//不還原初始狀態(tài)

animation.removedOnCompletion = NO;

animation.fillMode = kCAFillModeForwards;

[self.button.layer addAnimation:animation forKey:@"scale"];