在后台运行时间间隔计算

发布于 2024-10-28 12:53:19 字数 232 浏览 6 评论 0原文

我有一个 NSTimeInterval ，基本上

NSTimeInterval interval = [date1 timeIntervalSinceDate: [NSDate date]];

我希望当我在视图 X 中时这个计算始终在后台运行，这样我就可以在 UILabel 中显示倒计时计时器..我该怎么做？就像在groupon iphone应用程序中一样，但它不显示秒的详细信息

原文

I have a NSTimeInterval which is basically

NSTimeInterval interval = [date1 timeIntervalSinceDate: [NSDate date]];

I want this computation to be always running in the background when I am in a view X, so I can display a timer counting down in a UILabel.. how do I do this? It's like in the groupon iphone app, but it doesn't show it in details of seconds

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欲拥i 2024-11-04 12:53:19

您可以使用 NSTimer< /a> 获取按设定时间间隔调用的方法（但这全部在主线程上执行，而不是在后台线程上执行）：

- (void)setupTimer {
    //Start a timer to call update updateInterval: every 1 second
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                               target:self
                                               selector:@selector(updateInterval:)
                                             userInfo:nil
                                              repeats:YES];
}

- (void)updateInterval:(NSTimer *)timer {
    NSTimeInterval interval = [date1 timeIntervaleSinceDate:[NSDate date]];
    //Do other things like updating the label
}

You could use an NSTimer to get a method called at a set time interval (however this is all performed on the main thread, not on a background thread):

- (void)setupTimer {
    //Start a timer to call update updateInterval: every 1 second
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0
                                               target:self
                                               selector:@selector(updateInterval:)
                                             userInfo:nil
                                              repeats:YES];
}

- (void)updateInterval:(NSTimer *)timer {
    NSTimeInterval interval = [date1 timeIntervaleSinceDate:[NSDate date]];
    //Do other things like updating the label
}

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