iPhone 为 UIPickerView 填充值

Question

我创建了一个 UIPickerView，它在单击按钮时显示。问题是我如何填写 rowItems

UIActionSheet *actionSheet = [[UIActionSheet alloc] initWithTitle:@"Select Location"
                                                             delegate:self
                                                    cancelButtonTitle:@"Cancel"
                                               destructiveButtonTitle:nil
                                                    otherButtonTitles:nil];

    [actionSheet setActionSheetStyle:UIActionSheetStyleBlackTranslucent];
    UIPickerView *pickerView = [[UIPickerView alloc] initWithFrame:CGRectMake(0,100,0,0)];
    pickerView.showsSelectionIndicator = YES;
    pickerView.dataSource = self;
    pickerView.delegate = self;
    [actionSheet addSubview:pickerView];
    [pickerView release];
    UISegmentedControl *closeButton = [[UISegmentedControl alloc] initWithItems:[NSArray arrayWithObject:NSLocalizedString(@"Done", @"")]];
    closeButton.momentary = YES;
    closeButton.frame = CGRectMake(260, 7.0f, 50.0f, 30.0f);
    closeButton.segmentedControlStyle = UISegmentedControlStyleBar;
    closeButton.tintColor = [UIColor blackColor];
    [closeButton addTarget:self action:@selector(dismissActionSheet:) forControlEvents:UIControlEventValueChanged];
    [actionSheet addSubview:closeButton];   
    [closeButton release];
    [actionSheet showInView:self.view];
    [actionSheet setBounds:CGRectMake(0, 0, 320, 485)];

以及单击“完成”时如何获取值。

Answer 1

您已经设置了警报的委托和选择器。现在你必须实施它们。您不填写选择器的数据，选择器会向您的委托人询问数据。

您需要这三个协议中定义的强制功能。

UIPickerViewDelegate
UIPickerViewDataSource
UIActionSheetDelegate

你必须实现< code>-(IBAction)dismissActionSheet:(UIButton *)sender 也是如此。

以及单击“完成”时如何获取值。

每次选择器更改时，我都会将值存储到实例变量中，一旦单击“完成”按钮，我会将其分配给我的数据模型。

---

编辑：如果你想学习一些东西，我会摆脱复制和粘贴解决方案并尝试自己实现它。但是YMMV。