Question

我在iPhone项目中使用了UIDatePicker。我想在打开它之后在datepicker中显示日期，然后单击“完成”按钮。我正在使用此代码：

[datePicker addTarget:self action:@selector(changeDate:) forControlEvents:UIControlEventValueChanged]

changeDate是我在其他地方定义的方法，我在该方法中放入了相应的UIControlEventValueChanged代码。但是，即使我没有做任何更改，我也想在“完成”按钮后显示UIDatePicker中的值。我怎么能这样做？

Answer 1

您可以使用以下代码....

-(void)showDate{
    menu = [[UIActionSheet alloc] initWithTitle:@"Select Date"
               delegate:self
               cancelButtonTitle:nil
               destructiveButtonTitle:nil
               otherButtonTitles:nil];

    datePicker = [[UIDatePicker alloc] initWithFrame:CGRectMake(0.0, 44.0, 0.0, 0.0)];
    datePicker.datePickerMode = UIDatePickerModeDate;
    datePicker.minimumDate = [NSDate date];
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init];
    [dateFormatter setFormatterBehavior:NSDateFormatterBehavior10_4];
    [dateFormatter setLocale:[[[NSLocale alloc] initWithLocaleIdentifier:@"en_US"]autorelease]];
    [dateFormatter setDateFormat:@"dd MMM yyyy"];
    //[dateFormatter setDateFormat:@"MM/dd/YYYY"];

    //[theDatePicker release];
    [datePicker addTarget:self action:@selector(LabelChange:) forControlEvents:UIControlEventValueChanged];


    dateTool = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, 320, 44)];
    dateTool.barStyle=UIBarStyleBlackOpaque;
    [dateTool sizeToFit];
    NSMutableArray *barItems = [[NSMutableArray alloc] init];
    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone target:self action:@selector(DatePickerDoneClick)];
    [barItems addObject:flexSpace];

    [dateTool setItems:barItems animated:YES];
    [menu addSubview:dateTool];
    [menu addSubview:datePicker];
    [menu showInView:self.view];
    [menu setBounds:CGRectMake(0,0,320, 464)];


    //    [self.view addSubview:datePicker];

    [datePicker release];
}
-(IBAction)DatePickerDoneClick{
    [menu dismissWithClickedButtonIndex:0 animated:YES];
}
- (NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView
{
    return 1;
}

- (NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component{

        return [arrTime count];

}

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component
{

        return [arrTime objectAtIndex:row];

}

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component{

        txtTime.text = [arrTime objectAtIndex:row];

}

当我在iOS的UIDatePicker上点击完成但是值没有改变时触发的事件是什么？

1 个答案: