UIDatePicker限制小时但不限制日期 [英] UIDatePicker restrict hours but not date

问题描述

我遇到了一种情况，我需要限制 UIDatePicker 的选定小时，但仍允许自由选择当天。如果您希望允许用户在设置的营业时间内选择日期/时间，这将非常有用。通过警告用户他们的选择很糟糕，我发现了一些与我想做的事情很接近的事情，但实际上没有改变选择器上的日期，所以我想分享我的解决方案Q& A风格。

I came across a situation where I needed to restrict a UIDatePicker's selected hour, but still allow free selection of the day. This would be useful if you wanted to allow a user to select a date/time during set business hours. I found something that was close to what I was wanting to do by alerting the user that their selection was bad, but didn't actually change the date on the picker, so I wanted to share my solution Q&A-style.

推荐答案

此特定示例不允许选择上午7:00之前或下午9:59之后的时间。选择无效时间会立即将 UIDatePicker 滑回到相应光谱末端的最近有效时间（例如，选择10:02 pm会立即滑动回到晚上9:59）

This particular example will not allow selection of times before 7:00am or after 9:59pm. Selection of an "invalid" time will immediately slide the UIDatePicker back to the closest valid time on the respective end of the spectrum (for example, selection of 10:02pm will immediately slide back to 9:59pm)

- (void)datePickerChanged
{
    NSDateComponents *components = [[NSCalendar currentCalendar] components:NSYearCalendarUnit|NSMonthCalendarUnit|NSDayCalendarUnit|NSHourCalendarUnit|NSMinuteCalendarUnit fromDate:datePicker.date];

    if([components hour] < 7)
    {
        [components setHour:7];
        [components setMinute:0];
        [datePicker setDate:[[NSCalendar currentCalendar] dateFromComponents:components]];
    }
    else if([components hour] > 21)
    {
        [components setHour:21];
        [components setMinute:59];
        [datePicker setDate:[[NSCalendar currentCalendar] dateFromComponents:components]];
    }
}

编辑： As @ DuncanC在评论中建议，可能应该包括对用户的反馈，例如标签只能在上午7:00到晚上9:59之间使用

As @DuncanC suggested in the comments, feedback to the user should probably be included, such as a label saying "Only times between 7:00am and 9:59pm can be used"

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