iphone常用线程编写

1，创建一个新的子线程

//在分线程中操作
[NSThread detachNewThreadSelector:@selector(saveUserData) toTarget:self withObject:nil];

2，如果不在主线程中，将其加入主线程

//如果当前非主线程，将其加入主线程
if (![NSThread isMainThread])
    {
        [self performSelectorOnMainThread:@selector(loginSuccess) withObject:nil waitUntilDone:NO];
        return;
    }

3，使用闭包

//添加一个子线程
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
        //读取文件
        NSString *fileURL = [NSString stringWithFormat:@"http://cam.ppcam.tv/camera_image/2330000010/alarm.log"];
        NSData *date = [NSData dataWithContentsOfURL:[NSURL URLWithString:fileURL]];
        NSString* content = [[NSString alloc] initWithData:date encoding:NSASCIIStringEncoding];
        
        //当子线程处理完成在主线程中处理
        dispatch_sync(dispatch_get_main_queue(), ^{
            m_labText.numberOfLines = 0;
            m_labText.text = content;
            self.m_strDataSource = content;
        });
    });

//延迟0.5秒执行
        [self performSelector:@selector(clickloginBtn:) withObject:nil afterDelay:0.5];

还有很多，delegate的函数，用到在做补充