實現ios後臺縮略圖模糊的一種方法

附代碼：

- (void)applicationWillResignActive:(UIApplication *)application

{    

   //蓋上view

   UIView* view = [[UIViewalloc] initWithFrame:CGRectMake(0, 0, 320, 568)];

   view.backgroundColor =[UIColor redColor];

   view.alpha = 0.5;

   view.tag = 1111;

   [[[UIApplicationsharedApplication] keyWindow] addSubview:view];

}

- (void)applicationDidBecomeActive:(UIApplication *)application

{    

   //移除

   NSArray* array =[[UIApplication sharedApplication]keyWindow].subviews;

   

   for(id view in array)

    {

      if([view isKindOfClass:[UIView class]])

       {

         UIView* myView =view;

         if (myView.tag == 1111)

          {

              [myViewremoveFromSuperview];

          }

       }

    }

 

}