iOS開發（OC）——輸入框抖動效果

輸入錯誤時的輸入框抖動效果

CAKeyframeAnimation *shake=[CAKeyframeAnimation animationWithKeyPath:@"position.x"];
    shake.values=@[@0,@-10,@10,@-10,@0];
    shake.additive=YES;
    shake.duration=0.25;
    [view.layer addAnimation:shake forKey:@"shake"];