iPhone：返回NSMutableArray的方法中，同时还释放 [英] iPhone: Return NSMutableArray in method while still releasing

问题描述

我想了解多一点的内存管理。知道我需要释放什么，我已经init或alloc'ed我感到困惑如下：

I am trying to understand a little more about memory management. Knowing that I need to release anything that I have init or alloc'ed I am confused about the following:

- (NSMutableArray *)getData {
    NSMutableArray *data = [[NSMutableArray alloc] init];
    NSString *first = @"First object";
    [data addObject:first];
    NSString *second = @"Second object";
    [data addObject:second];

    return data;

}

由于我使用的alloc和init，我知道我需要释放我的数据对象。但是，如果我加入自动释放到init部分或回报，它崩溃，当我运行的方法。

Since I used alloc and init, I know I need to release my data object. But if I add autorelease to the init part or to the return, it crashes when I run the method.

什么是做这样的事情以正确的内存管理iPhone的正确方法是什么？

What is the correct way to do something like this with correct memory management for iPhone?

推荐答案

您应该自动释放，就像你说的。来电者可能需要保留，这样的 - 特别是如果存储到一个实例变量：

You should autorelease, like you said. The caller probably needs to retain, like this - especially if storing into an instance variable:

NSMutableArray *array = [[obj getData] retain];

后来，当它完全用它做：

Later, when it's totally done with it:

[array release]; // balances the retain above

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