当NSThread的函数调用时，NSURLConnection委托没有被调用

Question

我发送NSURLConnection请求它工作正常。现在我想刷新信息，即当从IBAction按钮调用时重新发送NSURLConnection.Refresh正在工作。但从NSThread方法不工作。我如何解决这个问题。这里用NSThread函数来运行系统时间。如果时间等于凌晨1点，我想刷新API。但它不叫NSURLConnection的代表。

这是NSURLConnection的代码：

-(void)displays:(model *)place 
{ 
    NSString *strs=[@"http://www.earthtools.org/timezone-1.1/" stringByAppendingString:[NSString stringWithFormat:@"%@/%@",place.latitude,place.longitude]]; 

    NSMutableURLRequest *request=[NSMutableURLRequest requestWithURL:[NSURL URLWithString:strs]]; 

    NSURLConnection *reqTimeZone=[NSURLConnection connectionWithRequest:request delegate:self]; 
    [reqTimeZone start]; //here request not get start 
} 

上面的代码在调用的函数“显示”的说法是类的一个实例它拥有所有地点的详细信息。

NSthread功能代码：

- (void) setTimer {  
    //assign current time 
    [self countDown]; 
} 

- (void) countDown { 
    //count the current time 

    if(hrs==12&& [email protected]"pm") 

    [self display:(placedetails)];//it calls the displays function but NSURLConnection is not get start. 

    [NSThread detachNewThreadSelector:@selector(setTimer) toTarget:self withObject:nil]; 
} 

上面显示函数被调用分配placedetails但NSURLConnection委托不叫。

Answer 1

对于要调用的委托方法，您需要将线程的runloop附加到NSURLConnection。由于您正在创建一个线程，并且不将NSURLConnection附加到线程的RunLoop，因此连接委托方法不会被触发。

下面是一个例子：

- (void)viewDidLoad 
{ 
    [super viewDidLoad]; 
    // Do any additional setup after loading the view, typically from a nib. 


    // I am creating a button and adding it to viewController's view 
    UIButton *bttn = [UIButton buttonWithType:UIButtonTypeRoundedRect]; 
    [bttn setFrame:CGRectMake(100.0f, 200.0f, 120.0f, 50.0f)]; 
    [bttn setTitle:@"Download" forState:UIControlStateNormal]; 
    [bttn addTarget:self action:@selector(spawnThreadForDownload) forControlEvents:UIControlEventTouchUpInside]; 

    [[self view] addSubview:bttn]; 
} 

- (void)spawnThreadForDownload 
{ 
    [NSThread detachNewThreadSelector:@selector(downloadAndParse) toTarget:self withObject:nil]; 
} 

- (void)downloadAndParse 
{ 
    @autoreleasepool { 
     NSURL *url = [NSURL URLWithString:@"http://apple.com"]; 
     NSURLRequest *req = [NSURLRequest requestWithURL:url 
              cachePolicy:NSURLRequestReloadIgnoringLocalAndRemoteCacheData 
             timeoutInterval:20.0f]; 
     NSURLConnection *conn = [NSURLConnection connectionWithRequest:req delegate:self]; 

     // Run the currentRunLoop of your thread (Every thread comes with its own RunLoop) 
     [[NSRunLoop currentRunLoop] run]; 

     // Schedule your connection to run on threads runLoop. 
     [conn scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSDefaultRunLoopMode]; 
    } 
} 

// NSURLConnectionDelegate methods 

- (void)connection:(NSURLConnection *)connection didFailWithError:(NSError *)error 
{ 
    NSLog(@"Connection failed with error: %@",[error localizedDescription]); 
} 

// NSURLConnectionDataDelegate methods 

- (void)connection:(NSURLConnection *)connection didReceiveResponse:(NSURLResponse *)response 
{ 

} 

- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data 
{ 

} 

- (void)connectionDidFinishLoading:(NSURLConnection *)connection 
{ 
    NSLog(@"Connection finished downloading"); 
}