Question

我正在使用MBProgressHUD作为指标。并且你知道它在执行其他方法时使用单独的线程。当我想使用NSURLConnection时，其代表团没有正确调用。

我在这里（@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。我怎么能解决这个问题？

Answer 1

您可以在主线程中启动NSURLConnection：

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

选择器的开头是：

- (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还有一个例子。

Answer 2

NSURLConnection在另一个应该有运行循环的线程中运行。您可以尝试在线程的主方法中添加运行循环的代码：

while (!finished)
{
  [[NSRunLoop currentRunLoop] runUntilDate:[NSDate dateWithTimeIntervalSinceNow:1]];
}

具有单独线程的NSURLConnection委派

2 个答案: