界面延迟刷新

来源：互联网发布：怎样安装税控盘软件编辑：程序博客网时间：2024/05/22 22:52

/*
     推迟三秒执行printString方法
     withObject:传的参数
     */

[self performSelector:@selector(printString:) withObject:@"Grand Central Dispatch" afterDelay:3.0];

//设置时间为2
    double delayInSeconds = 2.0;
    //创建一个调度时间,相对于默认时钟或修改现有的调度时间。
    dispatch_time_t delayInNanoSeconds =dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    //推迟两纳秒执行
    dispatch_queue_t concurrentQueue =dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    dispatch_after(delayInNanoSeconds, concurrentQueue, ^(void){
        NSLog(@"Grand Center Dispatch!");
    });

//设置时间
    double delayInSeconds = 2.0;
    dispatch_time_t delayInNanoSeconds =
    dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    dispatch_queue_t concurrentQueue = dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0);
    //调用C函数processSomething
    dispatch_after_f(delayInNanoSeconds, concurrentQueue,
                     NULL,
                     processSomething);

0 0