有没有理由保留计划的NSTimer如果你不需要使它无效

我要回到一些crufty代码整理它，我看到我一直保留从 scheduledTimerWithTimeInterval返回的NSTimers：target：selector：userInfo：repeats：并将它们存储在字段中，然后在触发时释放和取消字段。在某些情况下，我使用计时器向其发送无效的消息 - 但在很多情况下不是。

I'm going back over some crufty code to tidy it up and I see I've been retaining NSTimers returned from scheduledTimerWithTimeInterval:target:selector:userInfo:repeats: and storing them in a field - then releasing and nulling the field when it fires. In some cases I use the timer to send an invalidate message to it later - but in many cases not.

在最近的代码中，我通常只是计划定时器，它。我知道构造函数方法是自动释放，并且定时器在运行循环保持，而它是活动的 - 所以我没有看到任何问题。

In more recent code I usually just schedule the timer and forget about it. I understand that the constructor method is autoreleasing and the timer is retained by the run loop while it is active - so I don't see any issue with this.

只是为了加深我的理解 - 是否有任何其他原因，我应该坚持我的计时器，或者是我现在正在做的接受的成语？

So, just to round out my understanding - is there any other reason I should be holding on to my timers, or is what I am doing now the accepted idiom?

这是所有在iPhone代码的上下文中，但我不相信这是iPhone的具体。

This is all in the context of iPhone code, but I don't believe this is iPhone specific.