为键盘切换 UIPicker

Posted 2023-02-27

【中文标题】为键盘切换 UIPicker

【英文标题】：Switching a UIPicker for a keybaord

【发布时间】：2013-08-16 22:25:44

【问题描述】：

我对此进行了研究，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 Picker 中有三个选项，第三个是自定义选项。我要发生的是，选择自定义时，Uipicker将用键盘替换。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。另外我想制作一个带有后退按钮的工具栏来返回选择器。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出现一个按钮，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、工具栏和文本字段是：

...

- (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

【参考方案1】：

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

这基本上是隐藏 UIPickerView 然后删除它然后弹出键盘。

如果您想要 UIPicker 升级，请使用以下代码：

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

【讨论】：

我怎样才能让按钮把选择器带回来？