Objective-C在NSURLAuthenticationChallenge之後等待響應

我是新來的目標C。我正在創建一個需要登錄的網站的移動版本。我想弄清楚如何讓用戶名和密碼成爲收到NSURLAuthenticationChallenge後傳入。這裏是我的代碼：Objective-C在NSURLAuthenticationChallenge之後等待響應

Session.m

// log in 
-(BOOL)logIn 
{ 
    if (([Password class] == [NSNull class]) || ([Password length] == 0)) 
     return NO; 

    if (([Username class] == [NSNull class]) || ([Username length] == 0)) 
     return NO; 

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:URL_CONSTANT] 
          cachePolicy:NSURLRequestUseProtocolCachePolicy 
             timeoutInterval:10.0]; 

    NSURLConnection *connection = [[NSURLConnection alloc] initWithRequest:request delegate:self]; 
    [connection start]; 

    if (!connection) 
    { 
     return NO; 
    } 
    return Connected; 
} 

// handle authentiaction challenge 
-(void)connection:(NSURLConnection*)connection didReceiveAuthenticationChallenge:(NSURLAuthenticationChallenge *)challenge 
{ 
    NSLog(@"received auth challenge"); 
    if ([challenge previousFailureCount] == 0) 
    { 
     NSLog(@"received auth challenge"); 
     NSURLCredential *credentials = [NSURLCredential credentialWithUser:Username 
                   password:Password 
                   persistence:NSURLCredentialPersistenceForSession]; 

     NSLog(@"credential created"); 
     [[challenge sender] useCredential:credentials forAuthenticationChallenge:challenge]; 
     NSLog(@"responded to auth challenge"); 
    } 
    else 
    { 
     Connected = NO; 
     NSLog(@"previous auth failure"); 
    } 
} 

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

的用戶名和密碼都被傳遞到從一個的UITextField一個Session對象。這裏的問題是，在連接獲取數據之前NO會被返回。我如何告訴logIn方法等待傳入憑據，然後等待響應（如果憑據有效）？

來源

2014-02-12 Jared Price

建議：

如果可能的話，請iOS7只。
一旦你這樣做，你應該更喜歡有光澤的，新的NSURLSession，它取代NSURLConnection。 This是上手的好地方。
許多人也喜歡AFNetworking。

來源

2014-02-12 17:55:08

Objective-C在NSURLAuthenticationChallenge之後等待響應

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