具有单独线程的 NSURLConnection 委托(delegate)

Question

我正在使用 MBProgressHUD作为指标。你知道它在执行其他方法时使用了一个单独的线程。当我想使用 NSURLConnection 时，它的委托(delegate)没有正确调用。

这是我的(@implementation 文件):

- (void)viewDidLoad {
    [super viewDidLoad];
    [self hudShowWithLabel];
}

-(void)hudShowWithLabel {
    HUD = [[MBProgressHUD alloc] initWithView: self.view];
    [self.view addSubview:HUD];

    HUD.delegate = self;
    HUD.labelText = @"Loading";
    [HUD showWhileExecuting:@selector(myTask) onTarget:self withObject:nil animated:YES];
}

-(void)myTask {
    responseData = [NSMutableData data];
    NSLog(@"Is%@ main thread", ([NSThread isMainThread] ? @"" : @" NOT"));
    NSString *requestURL = @"http://someurl";

    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:requestURL]];
    (void)[[NSURLConnection alloc] initWithRequest:request delegate: self];    
}

在运行时，我可以看到 myTask 不在 MainThread 中。我该如何解决这个问题？

Answer 1

你可以在主线程中启动 NSURLConnection:

[self performSelectorOnMainThread:@selector(start) withObject:nil waitUntilDone:YES];

选择器开始是:

- (void)start
{
    NSURLRequest *request = [NSURLRequest requestWithURL:[NSURL URLWithString:requestURL]];

    self.connection =[[NSURLConnection alloc] initWithRequest:request
                                                 delegate:self
                                         startImmediately:NO];
    [self.connection scheduleInRunLoop:[NSRunLoop currentRunLoop] forMode:NSRunLoopCommonModes];
    [self.connection start];
}

github 上也有一个例子.