实际上使用 UIDatePickerModeCountDownTimer 作为计时器

发布于 2024-09-19 18:51:26 字数 535 浏览 6 评论 0原文

我只是想制作一个计时器。我想使用 UIDatePicker 的 UIDatePickerModeCountDownTimer 模式，这样当用户只需在选择器中选择 15 分钟时，它们就会传回显示该值的屏幕标签中包含 15 分钟，然后他们可以从中倒计时。

当我尝试从 DatePicker 获取值时，我意识到选择器会传回一个 NSTimeInterval ，该值以秒为单位获取当前时间：

UIDatePicker *pickerView = [[UIDatePicker alloc] init];
NSTimeInterval new = (NSTimeInterval)pickerView.countDownDuration;

所以我想要的就是知道用户选择的值，不是当前时间（以秒为单位）。

我正在尝试从 UIActionSheet 中呈现的 DatePicker 传回此数据...对正在发生的事情或我做错了什么有什么想法吗？

我只想要一个计时器！！！！！！！

原文

I am just trying to make a timer. I would like to use UIDatePickerModeCountDownTimer mode of the UIDatePicker, so that when the user simply selects say 15 mins in the picker, they are passed back to a screen that shows the value of 15 mins in a label that they can then count down from.

As I have tried to get the value from the DatePicker, I realized that the picker passes back an NSTimeInterval that gets the current time in seconds:

UIDatePicker *pickerView = [[UIDatePicker alloc] init];
NSTimeInterval new = (NSTimeInterval)pickerView.countDownDuration;

So all I want is to know the value that the user selected, not the current time in seconds.

I am trying to pass this data back from a DatePicker that is being presented in a UIActionSheet...any thoughts about what is going on or what I am doing wrong?

I just want a timer!!!!!!!

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谁对谁错谁最难过 2024-09-26 18:51:26

您的代码缺少一行，您必须为 UIDatePicker 设置模式。完整的代码应该是：

UIDatePicker *pickerView = [[UIDatePicker alloc] init];
pickerView.datePickerMode = UIDatePickerModeCountDownTimer;

// please DON'T use new because it is objc syntax
NSTimeInterval timeInterval = (NSTimeInterval)pickerView.countDownDuration;

然后如果您不知道如何将 NSTimeInterval （秒）转换为分钟，您可以使用这个问题

Your code lacks a line, you have to set the mode for your UIDatePicker. The full code should be:

UIDatePicker *pickerView = [[UIDatePicker alloc] init];
pickerView.datePickerMode = UIDatePickerModeCountDownTimer;

// please DON'T use new because it is objc syntax
NSTimeInterval timeInterval = (NSTimeInterval)pickerView.countDownDuration;

and then if you don't know how to convert your NSTimeInterval (seconds) to minutes, you can use this question

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