iOS Datepicker:如何锁定无效日期? [英] iOS Datepicker: How to LOCK invalid dates?

问题描述

最近，我一直在争取最大/最小日期，老实说，我不知道我在这里缺少什么.我进行了很多搜索，似乎没有人对此抱怨. (我不是在谈论设置最大/最小日期，因为它们只能使无效的日期显示为灰色)

I've been struggling with the maximum/minimum date lately, and honestly, I don't know what I'm missing here. I searched a lot and no one seems to complain about it. (I'm not talking about setting a maximum/minimum date as these can only make invalid dates appear gray)

这是我到目前为止所做的:

Here's what I've done so far:

    [myDatePicker addTarget:self action:@selector(disableDate) forControlEvents:UIControlEventValueChanged];

然后，在disableDate上，我有这样的内容:

Then, on disableDate, I have something like this:

if ([myDatePicker.date compare:[NSDate date]] == NSOrderedDescending) {
        MyDatePicker.date = [NSDate date];
    }

(或升序，这取决于我要禁用的日期)

(Or ascending, it depends on which dates I want to disable)

问题是:它可以正常运行，但只能运行一次.换句话说:打开视图并尝试选择一个视图(例如2007年)后，它就会滚动回到2013年.太好了.但是在那之后，如果我尝试滚动到任何无效的日期(包括2007年)，它将不再向后滚动，直到我重新打开视图. 我觉得这里缺少一些简单的东西，但是我不知道是什么.

The thing is: it works fine but only ONCE. In other words: as soon as I open the view and try to pick, for example, 2007, it scrolls back to 2013. Great. But right after that, if I try to scroll to any invalid date (including 2007), it won't scroll back anymore until I reopen my view. I feel like I'm missing something simple here, but I don't know what.

非常感谢！

PS:只需提一下，我已将其放入disableDate

PS: Just to mention, I've put this inside disableDate

    NSLog(@"Value changed");

只是为了确保每次我滚动日期选择器时都调用该方法，是的，它是有效的；

just to make sure it's calling the method everytime I scroll the datepicker, and yes, it is working;

PS2:我尝试过相同的操作，但使用的是

PS2: I've tried the same but using

- (IBAction)datePickerValueChanged:(id) sender

相反，它的行为完全相同.

instead and it had exactly the same behaviour.

推荐答案

因此，为了重置" UIDatePicker，您可以使用reloadInputViews方法(因为UIDatePicker是UIResponder

So in order to "reset" the UIDatePicker you can use reloadInputViews method (since UIDatePicker is subclass of UIResponder

拼写

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