Question

我遇到的情况是我需要限制UIDatePicker的所选时间，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。通过提醒用户他们的选择很糟糕，但实际上并没有改变选择器上的日期，我发现了一些与我想做的事情很接近的事情，所以我想分享我的解决方案Q＆amp; A风格。

Answer 1

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滑回频谱各自的最近有效时间（例如，选择10:02 pm将立即滑回到晚上9:59）

- (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：正如@DuncanC在评论中建议的那样，可能应该包含对用户的反馈，例如标签上写着“只能使用上午7:00到晚上9:59之间的时间”< / p>

Answer 2

在Swift2.0中：

func datePickerChanged() {
    let components = NSCalendar.currentCalendar().components(
        [NSCalendarUnit.Year, NSCalendarUnit.Month, NSCalendarUnit.Day, NSCalendarUnit.WeekOfYear, NSCalendarUnit.Hour, NSCalendarUnit.Minute, NSCalendarUnit.Second, NSCalendarUnit.Weekday, NSCalendarUnit.WeekdayOrdinal, NSCalendarUnit.WeekOfYear],
        fromDate: datePickerInstance.date)

    if components.hour < 7 {
        components.hour = 7
        components.minute = 0
        datePickerInstance.setDate(NSCalendar.currentCalendar().dateFromComponents(components)!, animated: true)
    }
    else if components.hour > 21 {
        components.hour = 21
        components.minute = 59
        datePickerInstance.setDate(NSCalendar.currentCalendar().dateFromComponents(components)!, animated: true)
    }
    else {
        print("Everything is good.")
    }
}

Answer 3

在Swift 4中：

func datePickerChanged() {
    var components = Calendar.current.dateComponents([.hour, .minute, .month, .year, .day], from: datePicker.date)

    if components.hour! < 7 {
        components.hour = 7
        components.minute = 0
        datePicker.setDate(Calendar.current.date(from: components)!, animated: true)
    }
    else if components.hour! > 21 {
        components.hour = 21
        components.minute = 59
        datePicker.setDate(Calendar.current.date(from: components)!, animated: true)
    }
    else {
        print("Everything is fine!")
    }
}

UIDatePicker限制小时但不限制日期

3 个答案: