抖动效果

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];
       
}
   
}];

}

转载于:https://www.cnblogs.com/rothwell/archive/2012/03/08/2385905.html

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