ios - NSURlConnection 取消导致内存泄漏

Question

这是一个非常奇怪的错误。

如果下载完成，我使用代码通过 NSURLConnection 下载文件，我没有泄漏。但是如果我取消下载，我有 1Mo 内存不会释放。我已经用仪器进行了测试，发现造成这种泄漏的方法是

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

真的很奇怪

这是我创建、管理和取消下载的代码

注意:此下载是核心数据托管对象的一部分，但我认为核心数据不对我的泄漏负责。

- (void)loadURL:(NSURL *)url
{

    if (currentLoadingDatas) { // just bool for prevent multiple download

        return;
    }
    currentLoadingDatas = YES;


    NSURLRequest *request = [[NSURLRequest alloc] 
                         initWithURL: url
                         cachePolicy:             NSURLRequestReloadIgnoringLocalAndRemoteCacheData
                         timeoutInterval: 60
                         ];
    connectionDatas = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [request release];

}

#pragma mark NSURLConnection Delegates
- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response
{

    if (!self.transientData) {

        self.transientData = [[NSMutableData alloc] init];
    }
    [self.transientData setLength:0];



}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data
{
    [self.transientData appendData:data];


}



- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{

    [self willChangeValueForKey:@"datas"];
[self setValue:self.transientData forKey:@"datas"];
    [self didChangeValueForKey:@"datas"];

    [self.transientData release];


    NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
    [NSURLCache setSharedURLCache:sharedCache];
    [sharedCache release];



}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error {


    NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
    [NSURLCache setSharedURLCache:sharedCache];
    [sharedCache release];


}

- (NSCachedURLResponse *)connection:(NSURLConnection *)connection     willCacheResponse:(NSCachedURLResponse *)cachedResponse
{
    return nil;
}

-(void)cancelDownload
{
    [self.connectionDatas cancel];


}

// fired by coreData 
-(void)willTurnIntoFault
{


    self.transientData = nil;
     [self cancelDownload];

    [super willTurnIntoFault];
}

// fired by coreData 
-(void)didTurnIntoFault
{

    [connectionDatas release];

NSURLCache *sharedCache = [[NSURLCache alloc] initWithMemoryCapacity:0 diskCapacity:0 diskPath:nil];
    [NSURLCache setSharedURLCache:sharedCache];
    [sharedCache release];

    [self.transientData release];
    [super didTurnIntoFault];
}

你能帮我找出问题所在吗？

非常感谢。

Answer 1

self.transientData 属性是如何声明的？
因为你初始化: self.transientData = [[NSMutableData alloc] init]; 并且如果属性设置为保留值，你将需要释放它两次。

如果是这样，设置属性使用:self.transientData = [[[NSMutableData alloc] init] autorelease]; 或者简单地 [NSMutableData data];.< br/>其余的对我来说似乎没问题。