UIImage setImage：導致內存泄漏

Question

我通過一個非常簡單的函數遇到了內存泄漏問題。 這是我的代碼：

  -(void) drawPuzzle
 {

      gameView.image=nil;     

      UIGraphicsBeginImageContext(gameView.frame.size);


      [gameView.image  drawInRect:CGRectMake(0,
                                             0, 
                                             gameView.frame.size.width,
                                             gameView.frame.size.height)];



       CGContextRef con=UIGraphicsGetCurrentContext();
       CGContextMoveToPoint(con, 20,0);
       CGContextAddLineToPoint(con,20, gameView.frame.size.height);
       CGContextStrokePath(con);


       UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); 
       UIGraphicsEndImageContext();
       [gameView setImage:newImage];


  }

儀器報告如下：

Event Type    RefCt      Responsible Caller

Malloc        1          +[UIImage imageWithCGImage: scale: orientation:] 
Autorelease              +[UIImage imageWithCGImage: scale: orientation:] 
Retain        2          -[UIImageView setImage:]
Release       1          -[NSAutoreleasePool drain]       

Answer 1

setImage:方法保留了newImage 。 為了避免內存泄漏，您需要在setImage之后釋放newImage

   UIImage* newImage = UIGraphicsGetImageFromCurrentImageContext(); 
   UIGraphicsEndImageContext();
   [gameView setImage:newImage];
   [newImage release];