iOS开发日常遇到的小技巧归纳

    // 异步子线程操作
    dispatch_queue_t  globalQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_async(globalQueue, ^{
        NSLog(@"子线程");
        /*
         * add code on child thread
         */

        // 返回主线程
        dispatch_async(dispatch_get_main_queue(), ^(void){
            NSLog(@"主线程");
            /*
             * add code on main thread
             */
        });
    });