Mac OS，控制台应用程序. performSelector:withObject:afterDelay:不起作用吗?

本文介绍了Mac OS，控制台应用程序. performSelector:withObject:afterDelay:不起作用吗?的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！ 问题描述

我在其中创建了一个简单的单例并运行方法:

I created a simple singleton and run method in it:

- (void)run { static int times = 0; NSLog(@"times = %d", times++); [self performSelector:@selector(run) withObject:nil afterDelay:MIN_DELAY]; }

但是它不能正常工作.它只能执行一次.

But it doesn't work properly. It is executed only once.

但是，如果我将performSelector:withObject:afterDelay:替换为performSelector:，那么它将被调用很多次(但我需要在两次调用之间延迟).

But if I replace performSelector:withObject:afterDelay: with performSelector: then it will be called a lot of times (but I need a delay between calls).

那么为什么方法performSelector:withObject:afterDelay:不起作用?我可以完全使用这种方法吗?

So why method performSelector:withObject:afterDelay: doesn't work? And can I use this method at all?

推荐答案

来自文档:

此方法向其当前上下文的运行循环进行注册，并依赖于定期运行的运行循环才能正确执行.

This method registers with the runloop of its current context, and depends on that runloop being run on a regular basis to perform correctly.

您没有运行循环.实际上，此方法无法为您正确执行.

You have no runloop. Ipso facto, this method does not perform correctly for you.

(创建和启动运行循环是调用UIApplicationMain的工作之一，但是当然您永远不会调用它.)

(Creating and starting a runloop is one of the things that calling UIApplicationMain does, but of course you are never calling it.)