內存泄漏使用多維數組

Question

我得到那個多維可變數組我需要刪除這些泄漏memoery泄漏，因爲由於這種泄漏的應用程序不能在iPhone的工作，我DNT如何消除這種泄漏

的CGRect bounds = [自我界限];

UITouch*   touch = [[event touchesForView:self] anyObject]; 
if (firstTouch) { 
    firstTouch = NO; 
    previousLocation = [touch previousLocationInView:self]; 
    previousLocation.y = bounds.size.height - previousLocation.y; 
    NSMutableArray *temp=[[NSMutableArray alloc]init]; 
    [undo addObject:temp]; 
    /***** add 1st point *********/ 
    [[undo objectAtIndex:[undo count] -1] addObject:[NSValue valueWithCGPoint:previousLocation]]; 

    if(mcount==1) 
    { 
     [masking addObject:[[NSMutableArray alloc]init]]; 
     [[masking objectAtIndex:[masking count]-1] addObject:[NSValue valueWithCGPoint:previousLocation]]; 
    } 
} else { 

    location = [touch locationInView:self]; 
    location.y = bounds.size.height - location.y; 
    previousLocation = [touch previousLocationInView:self]; 
    previousLocation.y = bounds.size.height - previousLocation.y; 


    [[undo objectAtIndex:[undo count] -1]addObject:[NSValue valueWithCGPoint:previousLocation]]; 

    if(mcount==1) 
    { 
     [[masking objectAtIndex:[masking count]-1] addObject:[NSValue valueWithCGPoint:previousLocation]]; 
    } 
} 

Answer 1

此

行：

NSMutableArray *temp=[[NSMutableArray alloc]init]; 

似乎泄漏。當你完成它時發佈temp或在這一行中發佈autorelease。

這條線：

[masking addObject:[[NSMutableArray alloc]init]]; 

也存在問題。既然沒有直接的指針，我推薦autorelease（或者重寫這段代碼，但我離題了）。

而且你可能有幫助的是，你可以改變

[undo objectAtIndex:[undo count] -1] 

，而不是成爲

[undo lastObjectAtIndex]