自上次触摸iOS中的特定视图控制器以来，如何检测用户不活动?

How to detect user inactivity since last touch on a particular viewcontroller in iOS?(自上次触摸iOS中的特定视图控制器以来，如何检测用户不活动?)

问题描述

当用户在 3 秒内未触摸特定屏幕时，我需要在视图控制器中执行特定操作.

I need to perform a particular action in a view controller when user don't touch a particular screen for 3 seconds.

如何在 iOS 中做到这一点?

How can I do that in iOS?

推荐答案

覆盖视图的 touches started 方法，并在触摸时重置计时器.

Override the view's touches began method and reset a timer when you get touches.

- (void)touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event
{
    [self.timer invalidate];
    self.timer = [NSTimer scheduledTimerWithTimeInterval:3.0 target:self selector:@selector(inactivityTimerFired) userInfo:nil repeats:NO];

    [super touchesBegan:touches withEvent:event];
}

如果需要，您可以定位视图控制器而不是 self.

You could target the view controller instead of self if you need to.

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