UIDatePicker min和max不会被更改

Question

我试图显示一个简单的日期选择器，其最大日期是今天，而最小值是100年前，但它根本不起作用且日期选择器没有限制。

CGRect frame = CGRectMake(0, CGRectGetHeight([UIScreen mainScreen].bounds)-250, CGRectGetWidth([UIScreen mainScreen].bounds), 250);

        UIDatePicker *datePicker = [[UIDatePicker alloc] initWithFrame:frame];
        datePicker.backgroundColor = [UIColor whiteColor];
        datePicker.datePickerMode = UIDatePickerModeDate;

        datePicker.minimumDate = [AppConfiguration currentDateMinusXYears:100];
        datePicker.maximumDate = [NSDate date];

        [datePicker addTarget:self action:@selector(datePicker:) forControlEvents:UIControlEventValueChanged];
        [self.view addSubview:datePicker];

+ (NSDate *)currentDateMinusXYears:(NSInteger)xYears
{    
    NSDate *today = [NSDate new];
    NSDateComponents *addComponents = [[NSDateComponents alloc] init];
    addComponents.year = - xYears;
    return [[NSCalendar currentCalendar] dateByAddingComponents:addComponents toDate:today options:0];
}

任何想法为什么？

编辑1： 我最终使用了第三方代码。

Answer 1

NSDateComponents *comps = [[NSDateComponents alloc] init];
[comps setYear:30];
NSDate *maxDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];
[comps setYear:0];
NSDate *minDate = [calendar dateByAddingComponents:comps toDate:currentDate options:0];

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