无法设置最大和最小日期到日期选择器

Question

我试图在日期选择器中设置最大和最小日期，如下所示。

  UIDatePicker *picker = [[UIDatePicker alloc] init];
    [picker setDatePickerMode:UIDatePickerModeDate];
    NSCalendar *gregorian = [[NSCalendar alloc] initWithCalendarIdentifier:NSCalendarIdentifierGregorian];
    NSDate *currentDt = [NSDate date];
    NSDateComponents *comps = [[NSDateComponents alloc] init];
    [comps setYear:-10];
    NSDate *minDate = [gregorian dateByAddingComponents:comps toDate:currentDt  options:0];
    [comps setYear:10];
    NSDate *maxDate = [gregorian dateByAddingComponents:comps toDate:currentDt  options:0];

    [picker setMaximumDate:maxDate];
    [picker setMinimumDate:minDate];

最高年份必须比当年提前10年，而最低年度必须比当年低10年

但这种方法不起作用。它显示了一切。

Answer 1

试试这个，它会起作用

NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar];
NSDate *currentDate = [NSDate date];
NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:10];
NSDate *maxDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
[comps setYear:-10];
NSDate *minDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];

[datePicker setMaximumDate:maxDate];
[datePicker setMinimumDate:minDate];