iphone - NSTimer 并在主线程上执行选择器

Question

是否可以在主线程上运行由 nstimer 调用的选择器？

NSTimer 在它自己的线程中生成。

我的结构是一个线程调用一个带有 nstimer 的方法，nstimer 调用一个执行一些更新的方法，但我需要这些更新发生在主线程上。解决办法是什么？添加另一个方法并说 performOnMainThread?

Answer 1

是的，从您的计时器例程中只需调用“performOnMainThread”即可。来自文档:

Timers work in conjunction with run loops. To use a timer effectively, you should be aware of how run loops operate—see NSRunLoop and Threading Programming Guide. Note in particular that run loops retain their timers, so you can release a timer after you have added it to a run loop.

还有一个关于使重复计时器无效的警告:

for a repeating timer, you must invalidate the timer object yourself by calling its invalidate method. Calling this method requests the removal of the timer from the current run loop; as a result, you should always call the invalidate method from the same thread on which the timer was installed