将异步回调结果返回给主线程

Question

异步线程rest

Answer 1

    if (![NSThread isMainThread]) {
        [self performSelectorOnMainThread:@selector(XXX:) withObject:nil waitUntilDone:NO];
    } 我是这么处理的,看看是不是你需要的

Answer 2

dispatch_async(dispatch_get_main_queue(), ^(){        //传字符串值    });

Answer 3

如果在block中用到self，要注意：
在block前定义：
__weak id weakSelf = self;block中：
weakSelf.name = name;主要防止都是强引用形成循环引用

Answer 4

[NSURLConnection sendAsynchronousRequest:request
                                       queue:[NSOperationQueue mainQueue]
                           completionHandler:^(NSURLResponse *response,
                                               NSData *data,
                                               NSError *error)
     {
         if ([data length]>0 && error == nil)
         {
            //do your stuff
         }
         else if([data length] == 0 && error == nil)
         {
             NSLog(@"Nothing was downloaded.");
         }
         else if(error != nil)
         {
             NSLog(@"Error = %@", error);
         }
         else
         {
             NSLog(@"other");
         }
     }];