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Question

NSURLConnection的委託方法我是從蘋果公司運行下面的示例代碼 -

 NSString *requestURL = [[NSString alloc] initWithString:@"http://google.com/"];   
     NSURLRequest *theRequest = [NSURLRequest requestWithURL:[NSURL URLWithString:requestURL] cachePolicy:NSURLRequestUseProtocolCachePolicy timeoutInterval:60.0]; 
     NSURLConnection *theConnection = [[NSURLConnection alloc] initWithRequest:theRequest delegate:self]; 

     if(theConnection) { 

      NSLog(@"The connection has started..."); 

     } else { 

      NSLog(@"Connection has failed..."); 

     } 

但低於委託方法不被調用。任何人都可以請幫我嗎？

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response { 
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data { 
- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error { 
- (void)connectionDidFinishLoading:(NSURLConnection *)connection { 

Answer 1

如果您在後臺線程上執行此操作，則可能會在代理可以調用​​之前退出線程。在你調用後臺線程CFRunLoopRun（）的方法之後，調用剛開始傳輸的方法。然後在你的回調connectionDidFinishLoading:和connection:didFailWithError:確保你也跑：

CFRunLoopStop(CFRunLoopGetCurrent()); 

在這些方法結束，否則你將永遠不會返回。

Answer 2

你在設置代表嗎？在類接口，其中的代碼的位置，添加<NSURLConnectionDelegate>

例如：

@interface myClass : parentClass<NSURLConnectionDelegate> 

祝你好運！