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我正在使用以下代码从任何 ftp 服务器加载列表：

    self.networkStream = CFBridgingRelease(
        CFReadStreamCreateWithFTPURL(NULL, (__bridge CFURLRef) url)
    );

    assert(self.networkStream != nil);
    //[self.networkStream setProperty:@"ANONYMOUS" forKey:(id)kCFStreamPropertyFTPUserName];
    //[self.networkStream setProperty:@"abc" forKey:(id)kCFStreamPropertyFTPPassword];
    self.networkStream.delegate = self;
    [self.networkStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [self.networkStream open];

它完美地加载了列表。然后我在 UITableView 中显示列表。加载数据后，我将使用以下代码关闭流：

if (self.networkStream != nil) {
        [self.networkStream removeFromRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
        self.networkStream.delegate = nil;
        [self.networkStream close];
        self.networkStream = nil;
    }

当用户点击任何单元格时，我试图加载该文件夹的列表（如果它是一个文件夹），否则我必须从 ftp 服务器下载文件。为此，我通过更改 url 使用此代码：

          self.networkStream = CFBridgingRelease(
                                           CFReadStreamCreateWithFTPURL(NULL, (__bridge CFURLRef) url)

                                           );
   /* [self.networkStream setProperty:( id) kCFBooleanFalse
                             forKey:( NSString *) kCFStreamPropertyFTPAttemptPersistentConnection
     ];
    */
    assert(self.networkStream != nil);
    //[self.networkStream setProperty:@"ANONYMOUS" forKey:(id)kCFStreamPropertyFTPUserName];
    //[self.networkStream setProperty:@"abc" forKey:(id)kCFStreamPropertyFTPPassword];
    self.networkStream.delegate = self;
    [self.networkStream scheduleInRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
    [self.networkStream open];

但是它在这条线上崩溃了：

CFReadStreamCreateWithFTPURL(NULL, (__bridge CFURLRef) url)

在这一行给出EXC_BAD_ACCESS。我无法弄清楚原因。请帮帮我。

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