NSMutableArray:调用方法时的内存管理 [英] NSMutableArray: Memory management while calling methods

问题描述

在我的iOS应用中，我正在使用一个名为imageMArray的NSMutableArray.我已经设置了它的getter和setter属性并实例化了它.

In my iOS app, I am using a NSMutableArray, named imageMArray. I have set its getter and setter properties and instantiated it.

在viewDidLoad中:

imageMArray=[[NSMutableArray alloc] initWithArray:CategoryImages];
imageMArray=[self shuffleOnlyArray:imageMArray];

在ShuffleOnlyArray方法中:

 NSMutableArray *destArray1 = [[NSMutableArray alloc] initWithCapacity: [sourceArray count]] ;
return destArray1;

随机播放方式:

imageMArray=[[self shuffleOnlyArray:imageMArray] retain];

Shuffle方法中似乎存在内存泄漏.

There appears to be a memory leak in the Shuffle method.

我应该释放imageMArray还是将其设置为nil?如果应该发布，应该自动发布吗?

Should I release imageMArray or set it to nil? If it should be released, should it be autoreleased?

推荐答案

imageMArray=[[NSMutableArray alloc] initWithArray:CategoryImages];

在上面的语句中，您有内存泄漏.相反，您可以像下面这样.

In the above statement, you have a memoryleak. Instead you can have like as follows.

imageMArray = [NSMutableArray arrayWithArray:CategoryImages];

在ShuffleOnlyArray方法中，返回自动释放的对象.

In ShuffleOnlyArray Method, return the autoreleased object.

NSMutableArray *destArray1 = [[NSMutableArray alloc] initWithCapacity: [sourceArray count]] ;
return [destArray1 autorelease];

但是，在获得它之后，保留(获取所有权)数组对象.

But after you get it, retain (take the ownership) the array object.

imageMArray=[[self shuffleOnlyArray:imageMArray] retain];

修改

在 shuffle 方法中，执行以下操作:

In shuffle method, do as follows:

NSMutableArray *imageMArray1 = [imageMArray mutableCopy];
if( imageMArray )
{
   [imageMArray release];
}
imageMArray=[[self shuffleOnlyArray:imageMArray1] retain];
[imageMArray1 release];

修改2:另一种解决方案:

使用 SO链接中提到的类别a>

Use the category to shuffle as mentioned in the SO link

无需创建新的和释放的数组.

No need of creating new and releasing the arrays.

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