Swift - 多线程实现方式

1.http://www.hangge.com/blog/cache/detail_743.html

2.http://www.hangge.com/blog/cache/detail_744.html

swift 线程更新UI

http://my.oschina.net/mycbb/blog/375826

dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT,0),{
        // do something 异步执行
     dispatch_sync(dispatch_get_main_queue(),{
          // do something   回调主线程             
     })
})