UIPickerView 在 TextField 上实时更新

发布于 2024-11-13 08:11:17 字数 324 浏览 3 评论 0原文

一旦我滚动 PickerView（或）UIDatePicker，我就需要将值显示在 TextField 上：

滚动时。即使选择器移动，文本字段也应该自行更新。这可能吗？
当拾取器停止移动并停止时。是否有一个让 PickerView 停止的事件，以便我可以更新文本字段（一旦 pickerView 停止）。
```
 // 我不想使用 TextFieldDidEndEditing 
 // 我希望文本字段在选择器视图停止时自动更新。 
```

如果有人能解决 1) 和 2)，那将会很有帮助

原文

As soon as I scroll the PickerView (or) UIDatePicker, I need the value to get displayed on a TextField :

While Scrolling. Even when the picker is moving the text field should update itself. Is it possible ?
On the event that the Picker stops moving and comes to rest. Is there an event for the PickerView to come to rest so that I could update the textField (as soon as the pickerView comes to rest).
```
  // I do not wish to use the TextFieldDidEndEditing 
 // I want the textField to update itself when the picker view comes to rest. 
```

It would be helpful if anyone could solve 1) and 2)

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無心 2024-11-20 08:11:17

(1) 可能不可能。对于(2)，您可以使用委托方法pickerView:didSelectRow:inComponent。如果您需要任何帮助，请告诉我。

对于UIPickerView

（1）实现pickerView:titleForRow:forComponent，

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    // Every time the picker view is rotated, this method will be called to fetch the title.
    NSInteger selectedRow = [pickerView selectedRowInComponent:0];
    // Get selected row like above and process data and update text field.


    [..] // Process the title
    return the title.
}

（2）这样就比较明显了。

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
   // You have the selected row, update the text field.
}

(1) might not be possible. For (2), you can use the delegate method pickerView:didSelectRow:inComponent. Let me know if you need any help with this.

For UIPickerView

(1) Implement pickerView:titleForRow:forComponent,

- (NSString *)pickerView:(UIPickerView *)pickerView titleForRow:(NSInteger)row forComponent:(NSInteger)component {
    // Every time the picker view is rotated, this method will be called to fetch the title.
    NSInteger selectedRow = [pickerView selectedRowInComponent:0];
    // Get selected row like above and process data and update text field.


    [..] // Process the title
    return the title.
}

(2) This is more obvious.

- (void)pickerView:(UIPickerView *)pickerView didSelectRow:(NSInteger)row inComponent:(NSInteger)component {
   // You have the selected row, update the text field.
}

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