UIDatePicker选择的日期不出现

Question

UIDatePickerView运行正常。 它显示了，我可以滚动浏览日期，但是由于某种原因，我的selectedOB.text一直显示为“今天的日期”！ 无论选择什么日期，它都会显示为今天的日期！

我选择这个：

NSLog，标签显示为：

这是代码：

- (IBAction)selectDOB:(id)sender 
{
    UIActionSheet *selectBirthMY = [[UIActionSheet alloc] initWithTitle:@"Select Date of Birth" delegate:self cancelButtonTitle:@"Cancel" destructiveButtonTitle:nil otherButtonTitles:@"Select", nil];
    [selectBirthMY setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
    [selectBirthMY showInView:[UIApplication sharedApplication].keyWindow];
    [selectBirthMY setFrame:CGRectMake(0, 100, 320, 500)];
}

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet
{
    UIDatePicker *pickerView = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 40, 320, 216)];
    pickerView.datePickerMode = UIDatePickerModeDate;

    [pickerView setMinuteInterval:15];
    //Add picker to action sheet
    [actionSheet addSubview:pickerView];
    //Gets an array af all of the subviews of our actionSheet

    NSArray *subviews = [actionSheet subviews];
    [[subviews objectAtIndex:1] setFrame:CGRectMake(20, 265, 280, 46)];
    [[subviews objectAtIndex:2] setFrame:CGRectMake(20, 317, 280, 46)];
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{
    UIDatePicker *DOBPicker = [[UIDatePicker alloc] init];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MMMM dd, YYYY"];

    NSDate *pickedDOB = [DOBPicker date];
    NSString *DOB = [dateFormatter stringFromDate:pickedDOB];
    NSLog (@"This is DOB %@", DOB);
    self.selectedDOB.text=DOB;
}

Answer 1

您正在使用UIDatePicker的两个不同实例。 您需要使用相同的datePicker实例来获取所选日期

为datePicker设置属性

@property (nonatomic, strong) UIDatePicker *pickerView;

- (void)willPresentActionSheet:(UIActionSheet *)actionSheet
{
    if(!self.pickerView){
        self.pickerView = [[UIDatePicker alloc] initWithFrame:CGRectMake(0, 40, 320, 216)];
        self.pickerView.datePickerMode = UIDatePickerModeDate;

        [self.pickerView setMinuteInterval:15];
        //Add picker to action sheet
        [actionSheet addSubview:self.pickerView];
    }

    //Gets an array af all of the subviews of our actionSheet

    NSArray *subviews = [actionSheet subviews];
    [[subviews objectAtIndex:1] setFrame:CGRectMake(20, 265, 280, 46)];
    [[subviews objectAtIndex:2] setFrame:CGRectMake(20, 317, 280, 46)];
}

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex
{

    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setDateFormat:@"MMMM dd, YYYY"];

    NSDate *pickedDOB = [self.pickerView date];
    NSString *DOB = [dateFormatter stringFromDate:pickedDOB];
    NSLog (@"This is DOB %@", DOB);
    self.selectedDOB.text=DOB;
}

Answer 2

这是因为您要在此方法中分配UIDatePicker的新实例

- (void)actionSheet:(UIActionSheet *)actionSheet clickedButtonAtIndex:(NSInteger)buttonIndex

所以不要创建新实例。 使用已经创建的datepicker实例。

希望对您有帮助。