iphone - iPhone应用程序：日期选择器视图作为下拉列表

Question

UIPickerView 选择和隐藏

当我在文本字段上“触地”时，我用它来弹出一个日期选择器视图。也就是说，我需要文本字段来显示我在日期选择器视图上选择的任何内容作为其内容。

在选择所需的日期/时间后单击“完成”按钮后，文本字段不会显示我的输入。

我错过了什么？

- (IBAction)showPicker:(id)sender {

// create a UIPicker view as a custom keyboard view
UIDatePicker* pickerView = [[UIDatePicker alloc] init];
[pickerView sizeToFit];
pickerView.autoresizingMask = (UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight);
//pickerView.delegate = self;
//pickerView.dataSource = self;
//pickerView.showsSelectionIndicator = YES;
self.datePickerView = pickerView;  //UIDatePicker



fromDate.inputView = pickerView;



// create a done view + done button, attach to it a doneClicked action, and place it in a toolbar as an accessory input view...
// Prepare done button
UIToolbar* keyboardDoneButtonView = [[UIToolbar alloc] init];
keyboardDoneButtonView.barStyle = UIBarStyleBlack;
keyboardDoneButtonView.translucent = YES;
keyboardDoneButtonView.tintColor = nil;
[keyboardDoneButtonView sizeToFit];

UIBarButtonItem* doneButton = [[[UIBarButtonItem alloc] initWithTitle:@"Done"
                                                                style:UIBarButtonItemStyleBordered target:self
                                                               action:@selector(pickerDoneClicked:)] autorelease];

fromDate.text = (NSString *)datePickerView.date; // fromDate is the Text Field outlet, where I am trying to display the selection on the picker.

[keyboardDoneButtonView setItems:[NSArray arrayWithObjects:doneButton, nil]];

// Plug the keyboardDoneButtonView into the text field...
fromDate.inputAccessoryView = keyboardDoneButtonView;  

[pickerView release];
[keyboardDoneButtonView release];
}

- (IBAction)pickerDoneClicked:(id)sender {

    [fromDate resignFirstResponder];
}

Answer 1

您必须为 UIControlEventValueChanged 的​​选择器设置选择器

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


 - (void)setDate:(id)sender{

     NSDateFormatter *df = [[NSDateFormatter alloc] init];

     df.dateStyle = NSDateFormatterMediumStyle;

     date.text = [NSString stringWithFormat:@"%@",
                  [df stringFromDate:datePicker.date]];

}