何时在iPhone中发布NSString [英] When to release a NSString in iPhone

问题描述

我有以下方法

   -(NSMutableArray *) getPaises {
     NSMutableArray * paises;
     paises = [[NSMutableArray alloc] init];
     while( get new row ) {
      NSString *aPais =  [NSString stringWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
      [paises addObject:aPais];
     }
     return paises;
    }

我不是发布aPais，因为如果我做的应用程序崩溃。我不知道什么时候或者是否应该在使用后在某处释放它，如果是，我该怎么做。只是释放NSMutableArray就够了？或者我必须遍历它并释放每个对象吗？

I am not releasing the aPais, because if I do it the application crashes. I don't know when or if whether I should release it somewhere after using it and, if so, how do I do it. Just release the NSMutableArray is enough? Or do I have to traverse it and release each object?

如果我不需要释放它，谁是负责释放？

And if I don't have to release it, who is the responsible for releasing?

推荐答案

如epatel所说，你不需要释放那个特定的字符串。如果你想更积极主动，你可以这样做：

As epatel said, you don't need to release that particular string. If you wanted to be more proactive, you could do this instead:

-(NSMutableArray *) getPaises {
    NSMutableArray * paises;
    paises = [[[NSMutableArray alloc] init] autorelease];
    while( get new row ) {
        NSString *aPais =  [[NSString alloc] initWithUTF8String:(char *)sqlite3_column_text(compiledStatement, 0)];
        [paises addObject:aPais];
        [aPais release];
    }
    return paises;
}

总结：

• [[NSString alloc] initWith ...] - >您必须释放或自动释放。

• [[NSString alloc] initWith...] -> You must release or autorelease.

[NSString

[NSString stringWith...] -> No need to release.

- 编辑：添加 autorelease 为paises，因为你正在返回它。当你返回一个对象，总是自动释放它，如果你有alloc& init'd它。

-- Added autorelease for paises, as you are returning it. When you return an object, always autorelease it if you have alloc&init'd it.

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