ios - Apple 的可达性内存泄漏

Question

我在我的非 arc 项目中使用了 apple 的 Reachabily 类。当我用仪器运行它来查找内存泄漏时，它指的是可达性方法。这是问题所在:

+ (instancetype)reachabilityWithAddress:(const struct sockaddr_in *)hostAddress;
{
    SCNetworkReachabilityRef reachability = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr *)hostAddress);

    WReachability* returnValue = NULL;

    if (reachability != NULL)
    {
        returnValue = [[self alloc] init];
        if (returnValue != NULL)
        {
            returnValue->reachabilityRef = reachability;
            returnValue->localWiFiRef = NO;
        }
    }
    return returnValue;
}

泄露的对象是reachability和returnValue。 我知道 SCNetworkReachabilityCreateWithAddress 创建了一个新实例，我必须 CFRelease 它，但它发生在 dealloc 中!

- (void)dealloc
{
    [self stopNotifier];
    if (reachabilityRef != NULL)
    {
        CFRelease(reachabilityRef);
    }
    [super dealloc];
}

那么我该怎么做才能避免内存泄漏呢？

更新: 也许问题在于如何调用可达性？我使用这种方法:

+ (instancetype)reachabilityForInternetConnection;
{
    struct sockaddr_in zeroAddress;
    bzero(&zeroAddress, sizeof(zeroAddress));
    zeroAddress.sin_len = sizeof(zeroAddress);
    zeroAddress.sin_family = AF_INET;

    return [self reachabilityWithAddress:&zeroAddress];
}

然后我这样调用 Reachability:

[[Reachability reachabilityForInternetConnection] startNotifier];

并且不要将其分配给任何对象，只需使用这一行即可。 我试图将此调用更改为:

Reachability *reachability = [[Reachability reachabilityForInternetConnection] autorelease];
[reachability startNotifier];

但是在这个分析器告诉我“自动释放太多”之后。

Answer 1

@Alexart 的回答对我有用，但如果你想要一个简化版本，请使用

+(instancetype)reachabilityWithAddress:(void *)hostAddress
{
   SCNetworkReachabilityRef ref = SCNetworkReachabilityCreateWithAddress(kCFAllocatorDefault, (const struct sockaddr*)hostAddress);
   if (ref)
   {
      id reachability = [[self alloc] initWithReachabilityRef:CFBridgingRetain((__bridge id)ref)];
      CFRelease(ref);
      return reachability;
   }
   return nil;