ios - NSURLConnection - didReceiveData 没有被调用 - iOS & ARC

Question

我目前正在尝试使用 twitter 流 api，并且正在尝试使用NSURLConnection. 由于它不适用于 twitter，我简化了所有内容并尝试从 google 的网站上获取一些源代码，但这也不起作用。

连接开始和结束，但不调用didReceiveData委托。我确定我错过了一些东西。希望你们能帮助我！

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

在体内：

- (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!");
}

score 2 · Accepted Answer

几个想法。

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

鉴于的存在NSURLAuthenticationChallengeSender，如果您期待挑战（您不会通过 Google 网站获得），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];
    }
}

顺便说一句，您不想start在使用initWithRequestor时调用方法connectionWithRequest。initWithRequest:delegate:startImmediately:仅当您执行简单操作并指示它不要时才需要它startImmediately。

无论如何，我使用了以下，它工作正常：

- (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);
}

score 0 · Accepted Answer

您的 NSURLConnection 局部变量connection在viewDidLoad. 向您的 ViewController 添加一个属性以在范围内保存 NSURLConnection 变量。

score 0 · Accepted Answer

这里有人说是他们的SOAP格式 NSURLConnection委托方法：didReceiveData not called ...Why ?? (iPhone SDK)

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

ios - NSURLConnection - didReceiveData 没有被调用 - iOS & ARC

3 回答 3

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