下载iOS中的进度条

Question

我想在iOS应用中显示下载进度。我实现了方法

-(void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response和-(void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data

但他们没有被召唤。我如何设法让他们被召唤？我应该建立连接吗？我正在做，没有任何反应。

由于

以下是一些代码：

- (void) connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{
    NSLog(@"Data");
}

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{
    NSLog(@"Response"); 
}

- (void) playAudiotWithURL:(NSString *)url 
{
    plistManager = [[GVPlistPersistence alloc] init];
    arrayConfigs = [plistManager plistFromDocumentsFolderNamed:@"Configs.plist"];
    NSError *error;
    nerdcast = [NSData dataWithContentsOfURL:[NSURL URLWithString:url]];

    request = [[NSURLRequest alloc] initWithURL:[NSURL URLWithString:url]];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self startImmediately:YES];

    audioPlayer = [[AVAudioPlayer alloc] initWithData:nerdcast error:&error];

    audioPlayer.numberOfLoops = 0;
    audioPlayer.delegate = self;
    audioPlayer.volume = 1.0f;
    [audioPlayer prepareToPlay];

    [audioPlayer play];
}

从另一个类

调用

PlayAudioFromURL