每x秒更新一次标签 [英] Update a label with speed every x seconds

问题描述

我正在开发我的第一个iPhone应用程序。我必须每x秒更新一次设备速度标签。我已经创建了自己的 CLController 并可以提高设备速度，但是我不知道是否必须使用 NSTimer 更新我的标签。我该怎么办？

I'm developing my first iPhone application. I have to update a label with the device speed every x seconds. I have created my own CLController and I can get device speed but I don't know if I have got to use NSTimer to update my label. How can I do it?

推荐答案

您可以像这样安排计时器

You can schedule the timer like this

NSTimer *myTimer = [NSTimer scheduledTimerWithTimeInterval:YOUR_INTERVAL 
                       target:self 
                       selector:@selector(updateLabel) 
                       userInfo:nil 
                       repeats:YES];

现在，下面的方法将在每个YOUR_INTERVAL（以秒为单位）内调用

Now below method will get called in every YOUR_INTERVAL (in seconds) periods

- (void) updateLabel {
    myLabel.text = @"updated text";
}

要停止计时器，可以在计时器对象上调用无效。因此，您可能希望将计时器另存为成员变量，以便可以在任何地方访问它。

To stop the timer you could call invalidate on the timer object. So you might want to save the timer as a member variable, so that you can access it anywhere.

[timer invalidate];

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