iphone - 延迟后使用选择器执行多个操作

Question

有没有办法使用:performSelector:withObject:afterDelay 代码分别执行多个操作？示例代码将不胜感激，提前致谢。

Answer 1

或者使用 block 。如果您开始输入 dispatch_after，您将看到代码完成，其中将弹出以下代码片段，然后您可以在该 block 中放置任意数量的操作。在此示例中，我展示了它在 IBAction 内使用:

- (IBAction)pushedSomeButton:(id)sender
{
    // anything you want to do immediate, do here

    [self doingSomethingRightNow];

    // anything you want to defer for some time, do inside the dispatch_after block
    // in this example, calling callAnotherMethod and whyNotCallAnotherMethod

    int64_t delayInSeconds = 2.0;
    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
        [self callAnotherMethod];
        [self whyNotCallAnotherMethod];
    });
}