Question

我正在尝试使用twitter流式传输API，我正在尝试使用NSURLConnection获取流。因为它不适用于Twitter，我简化了一切，并试图从谷歌的网站上获取一些源代码，但这不起作用。

连接开始和结束，但不调用didReceiveData委托。我确定我错过了什么。希望你的家伙可以帮助我！

标题：@interface ViewController : UIViewController <NSURLConnectionDataDelegate, NSURLConnectionDelegate, NSURLConnectionDownloadDelegate, NSURLAuthenticationChallengeSender>

在身体里：

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSURLConnection *connection;
    NSMutableURLRequest *request;
    // Do any additional setup after loading the view, typically from a nib.
    request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.google.com"]];
    [request setHTTPMethod:@"GET"];
    connection = [[NSURLConnection alloc] initWithRequest:request delegate:self];
    [connection start];
}

- (void)connectionDidFinishDownloading:(NSURLConnection *)connection destinationURL:(NSURL *)destinationURL {
    NSLog(@"Stream finished.");
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    NSString *dataString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%@", dataString);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"Connection failed!");
}

Answer 1

一些想法。

您对connectionDidFinishLoading的声明看起来不正确。标准NSURLConnectionDataDelegate方法没有destinationURL参数：
```
- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"%s", __FUNCTION__);
}
```

鉴于存在NSURLAuthenticationChallengeSender，如果您预计会遇到质疑（Google网站无法提供此问题），那么您显然会相应地处理它：

- (void)connection:(NSURLConnection *)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge
{
    // For example, if you have a userid/password to use, see if this is the first 
    // challenge, and then tell NSURLConnection to try using those credentials, and if 
    // it failed a second time, you might just cancel the authentication challenge.

    if (challenge.previousFailureCount == 0) {
        NSURLCredential *credential = [NSURLCredential credentialWithUser:kUserID password:kPassword persistence:NSURLCredentialPersistenceForSession];
        [challenge.sender useCredential:credential forAuthenticationChallenge:challenge];
    } else {
        [challenge.sender cancelAuthenticationChallenge:challenge];
    }
}

顺便说一下，当您使用initWithRequest或connectionWithRequest时，您不想调用start方法。只有在您执行简单initWithRequest:delegate:startImmediately:并指示不 startImmediately时才需要它。

无论如何，我使用了以下内容并且工作正常：

- (void)viewDidLoad
{
    [super viewDidLoad];

    NSMutableURLRequest *request = [[NSMutableURLRequest alloc] initWithURL:[NSURL URLWithString:@"http://www.google.com"]];
    [NSURLConnection connectionWithRequest:request delegate:self];
}

- (void)connectionDidFinishLoading:(NSURLConnection *)connection
{
    NSLog(@"%s", __FUNCTION__);
}

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
    NSString *dataString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
    NSLog(@"%s: %@", __FUNCTION__, dataString);
}

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error{
    NSLog(@"%s error=%@", __FUNCTION__, error);
}

Answer 2

有人在这里说这是他们的SOAP格式 NSURLConnection delegate method: didReceiveData not called ...Why ?? (iPhone SDK)

这也可能是您正在寻找的 NSURLConnection didReceiveData not called

Answer 3

您的NSURLConnection局部变量connection超出viewDidLoad末尾的范围。向ViewController添加属性以将NSURLConnection变量保存在范围内。

NSURLConnection - didReceiveData没有被调用 - iOS＆amp;弧

3 个答案: