iphone - 为键盘切换 UIPicker

Question

我已经对此进行了研究，但只发现了如何将键盘切换为键盘。现在我有一个 UIPicker，它会在点击文本字段时出现。在选择器中有三个选项，第三个是自定义。 What I want to happen is when custom is selected the UIPicker is replaced with a keyboard.我猜这将通过 if (select == 2) { } 方法完成。我不需要一大堆代码，只需要替换 Picker 的方法。我还想制作一个带有后退按钮的工具栏以返回选择器。我目前有一个带有 doneButton 的工具栏来释放选择器，但我需要在键盘出现时显示一个按钮，并且该按钮能够将键盘切换回我的选择器。

到目前为止，我的选择器、toolabr 和文本字段是:

...

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.

    NSArray *array = [[NSArray alloc] initWithObjects:@"...",@"...",@"Custom", nil];
    self.PickerData = array;

...

    UIToolbar *toolBar = [[UIToolbar alloc] init];
    toolBar.barStyle = UIBarStyleBlackOpaque;
    [toolBar sizeToFit];

...

    UIBarButtonItem *flexSpace = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace
                                                                               target:self
                                                                               action:nil];
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemDone
                                                                                target:self
                                                                                action:@selector(releasePicker)];


    Picker = [[UIPickerView alloc] init];
    Picker.showsSelectionIndicator = YES;
    Picker.delegate = self;
    doneButton.image = [UIImage imageNamed:@"button.png"];

    [toolBar setItems:@[flexSpace, doneButton] animated:YES];
    self.habitField.inputAccessoryView = toolBar;

    [self.habitField setEnabled: YES];

    [self.habitField setInputView:Picker];

}
- (void)releasePicker {
    [self.habitField resignFirstResponder];
}

...

-(NSInteger)numberOfComponentsInPickerView:(UIPickerView *)pickerView {
    return 1;
}

-(NSInteger)pickerView:(UIPickerView *)pickerView numberOfRowsInComponent:(NSInteger)component {
    return [PickerData count];
}

-(NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    return [self.PickerData objectAtIndex:row];
}

-(void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
    int select = row;
    if (select == 0) {

        ...
    }
    if (select == 1) {

        ...
    }
    if (select == 2) {

        ...

    }
}


@end

Answer 1

if (select == 2) {
      [self.habitField resignFirstResponder];
      [self.habitField setInputView:nil];
      [self.habitField becomeFirstResponder];
} 

这基本上是隐藏 UIPickerView，然后将其移除，然后弹出键盘。

如果你想要 UIPicker 启动，请使用此代码:

[self.habitField resignFirstResponder];
[self.habitField setInputView:PickerData];
[self.habitField becomeFirstResponder];