CABasicAnimation *animation=[CABasicAnimation animationWithKeyPath:@"transform.scale"];
animation.toValue = @2.0f; //放大倍數(shù)
animation.duration = 0.5f;//動畫時間
animation.autoreverses = NO;
//不還原初始狀態(tài)
animation.removedOnCompletion = NO;
animation.fillMode = kCAFillModeForwards;
[self.button.layer addAnimation:animation forKey:@"scale"];
