iphone - 如何避免用户在 UIDatePicker 中选择某个日期？

Question

我必须提示用户从可可 UIDatePicker 中选择日期，但要避免他选择周日和周六，因为我的目标是让他们选择约会日期

最好的方法应该是禁用该日期，以与 minimumDate 属性相同的方式，但我无法找到如何做到这一点

Answer 1

你可以这样做：

UIDatePicker *datePicker = [[UIDatePicker alloc] init];
[datePicker addTarget:self action:@selector(dateChanged:) forControlEvent:UIControlEventValueChanged];

实施dateChanged：

- (void)dateChanged:(id)sender {
  UIDatePicker *datePicker = (UIDatePicker *)sender;
  NSDate *pickedDate = datePicker.date;

  NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
  NSDateComponents *weekdayComponents = [gregorian components:NSWeekdayCalendarUnit fromDate:pickedDate];
  NSInteger weekday = [weekdayComponents weekday];
  [gregorian release];

  if (weekday == 1 || weekday == 7) { // Sunday or Saturday
    NSDate *nextMonday = nil;
    if (weekday == 1)
      nextMonday = [pickedDate dateByAddingTimeInterval:24 * 60 * 60]; // Add 24 hours
    else
      nextMonday = [pickedDate dateByAddingTimeInterval:2 * 24 * 60 * 60]; // Add two days

    [datePicker setDate:nextMonday animated:YES];

    return;
  }

  // Do something else if the picked date was NOT on Saturday or Sunday.
}

This way, when a date is picked that is either on a Saturday or Sunday, the date picker automatically selects the Monday after the weekend.

（代码未经测试！）