UIDatePicker restrict hours but not date

Question

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 wan

Answer 1

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]];
    }
}

Edit: 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"