抖动效果-优快云博客

本文详细介绍两种在iOS应用中实现视图震动效果的方法。第一种方法使用了UIView的动画功能，通过变换视图的位置来模拟地震震动；第二种方法则通过快速左右移动视图实现摇晃效果。这两种方法都利用了CGAffineTransform进行坐标变换，并通过UIView动画控制震动的重复次数和持续时间。

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方法1

-(void)earthquake:(UIView*)itemView
{
    CGFloat t =2.0;

    CGAffineTransform leftQuake  =CGAffineTransformTranslate(CGAffineTransformIdentity, t,-t);
    CGAffineTransform rightQuake =CGAffineTransformTranslate(CGAffineTransformIdentity,-t, t);

    itemView.transform = leftQuake;  // starting point

    [UIView beginAnimations:@"earthquake" context:itemView];
    [UIView setAnimationRepeatAutoreverses:YES];// important
    [UIView setAnimationRepeatCount:5];
    [UIView setAnimationDuration:0.07];
    [UIView setAnimationDelegate:self];
    [UIView setAnimationDidStopSelector:@selector(earthquakeEnded:finished:context:)];

    itemView.transform = rightQuake;// end here & auto-reverse

    [UIView commitAnimations];
}

-(void)earthquakeEnded:(NSString*)animationID finished:(NSNumber*)finished context:(void*)context 
{
    if([finished boolValue]) 
    {
        UIView* item =(UIView*)context;
        item.transform =CGAffineTransformIdentity;
    }

}

方法2

-(void)shakeView:(UIView*)viewToShake
{
    CGFloat t =2.0;
    CGAffineTransform translateRight  =CGAffineTransformTranslate(CGAffineTransformIdentity, t,0.0);
    CGAffineTransform translateLeft =CGAffineTransformTranslate(CGAffineTransformIdentity,-t,0.0);

    viewToShake.transform = translateLeft;

    [UIView animateWithDuration:0.07 delay:0.0 options:UIViewAnimationOptionAutoreverse|UIViewAnimationOptionRepeat animations:^{
        [UIView setAnimationRepeatCount:2.0];
        viewToShake.transform = translateRight;
    } completion:^(BOOL finished){
        if(finished){
            [UIView animateWithDuration:0.05 delay:0.0 options:UIViewAnimationOptionBeginFromCurrentState animations:^{
                viewToShake.transform =CGAffineTransformIdentity;
            } completion:NULL];
        }
    }];