与 scheduleTimerWithTimeInterval 添加时 NSTimer 不触发选择器 [英] NSTimer not firing selector when added with scheduledTimerWithTimeInterval

问题描述

我有一个这样的代码片段:

I have a code snippet like this:

m_timer = [NSTimer scheduledTimerWithTimeInterval:timeOutInSeconds
                                                       target:self
                                                     selector:@selector(activityIndicatorTimer:)
                                                     userInfo:nil
                                                      repeats:NO];

当我这样称呼它时，在给定的 timeOutInSeconds 之后选择器不会被触发.但是，如果我将其修改为如下所示，则选择器将被调用两次.

When I call it like so the selector is not fired after the given timeOutInSeconds. However, if I modify it to be like the following, then the selector is called twice.

NSLog(@"Timer set");
m_timer = [NSTimer scheduledTimerWithTimeInterval:timeOutInSeconds
                                               target:self
                                             selector:@selector(activityIndicatorTimer:)
                                             userInfo:nil
                                              repeats:NO];
[[NSRunLoop currentRunLoop] addTimer:m_timer forMode:NSRunLoopCommonModes];

有人可以就我可能做错的事情提供任何建议吗?

Could anyone offer any suggestion as to what I am likely doing wrong?

我正在使用 XCode 5.1，并在 7.1.1 iPhone 4S 上构建

I am using XCode 5.1, and building on 7.1.1 iPhone 4S

推荐答案

在主线程中调用这个定时器:

Call this timer in main thread:

dispatch_async(dispatch_get_main_queue(), ^{
   m_timer = [NSTimer scheduledTimerWithTimeInterval:timeOutInSeconds
                                                   target:self
                                                 selector:@selector(activityIndicatorTimer:)
                                                 userInfo:nil
                                                  repeats:NO];
});

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