Iphone 在此代码中，在何处释放CFStringRef

我有下面的代码。我对保留/发布概念有点不确定

for (int i = 0; i < ABMultiValueGetCount(urls)  ; i++) {
    CFStringRef url = ABMultiValueCopyValueAtIndex(urls, i);
    CFStringRef urlType = ABMultiValueCopyLabelAtIndex(urls, i);
    urlString  = (NSString *)url;
    urlTypeString = (NSString *)urlType;
    if ([urlTypeString hasPrefix:@"_"]) {
        NSString * urlTypeSubString = [urlTypeString substringWithRange:NSMakeRange(4, ([urlTypeString length]-8))];
        [mutableArray addObject:[NSString stringWithFormat:@"URL; %@: http://%@",urlTypeSubString,urlString]];
    }else{
        [mutableArray addObject:[NSString stringWithFormat:@"URL; %@: http://%@",urlTypeString,urlString]];
    }
}

for（inti=0；i

我有两个问题

在这段代码中，我应该在哪里发布'CFStringRef url'和'CFStringRef urlType'

我是否应该释放“urlString”和“urlTypeString”，它们是字符串类型

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在这场比赛的最后

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看看这个：

在for

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看看这个：

在for循环的末尾

for (int i = 0; i < ABMultiValueGetCount(urls)  ; i++) 
{
    CFStringRef url = ABMultiValueCopyValueAtIndex(urls, i);
    CFStringRef urlType = ABMultiValueCopyLabelAtIndex(urls, i);
    urlString  = (NSString *)url;
    urlTypeString = (NSString *)urlType;
    if ([urlTypeString hasPrefix:@"_"]) {
        NSString * urlTypeSubString = [urlTypeString substringWithRange:NSMakeRange(4, ([urlTypeString length]-8))];
        [mutableArray addObject:[NSString stringWithFormat:@"URL; %@: http://%@",urlTypeSubString,urlString]];
    }
    else
    {
        [mutableArray addObject:[NSString stringWithFormat:@"URL; %@: http://%@",urlTypeString,urlString]];
    }
    // Release here
    CFRelease(url);
    CFRelease(urlType);
}

for（inti=0；i

在for循环的末尾

for (int i = 0; i < ABMultiValueGetCount(urls)  ; i++) 
{
    CFStringRef url = ABMultiValueCopyValueAtIndex(urls, i);
    CFStringRef urlType = ABMultiValueCopyLabelAtIndex(urls, i);
    urlString  = (NSString *)url;
    urlTypeString = (NSString *)urlType;
    if ([urlTypeString hasPrefix:@"_"]) {
        NSString * urlTypeSubString = [urlTypeString substringWithRange:NSMakeRange(4, ([urlTypeString length]-8))];
        [mutableArray addObject:[NSString stringWithFormat:@"URL; %@: http://%@",urlTypeSubString,urlString]];
    }
    else
    {
        [mutableArray addObject:[NSString stringWithFormat:@"URL; %@: http://%@",urlTypeString,urlString]];
    }
    // Release here
    CFRelease(url);
    CFRelease(urlType);
}

for（inti=0；i