Question

我有一个comboBox，其样式设置为具有文本行和复选框，以允许用户检查不同事物的列表。我试图做的是禁用组合框中的一行选择。

我的查看代码：

//func2
functon getPromise(options) {
  return apiRequest(options).then(response => {
    if (response.body.hasOwnProperty('message')) {
      console.error(`Error: Invalid token`);
      const payload = {
        url: 'https://abc',
        form:{},
        method: 'post'
      };
      return apiRequest(payload).then(result => {
        options.headers.Authorization = 'Bearer '+result.body;
        return getPromise(options); // seems Issue having this line to call again
      });
    } else {
      return response.body;
    }
  });
}

这是我的下拉菜单的照片：

以下是我不想要的照片：

我想禁用用户选择特定行的功能，但保留他们在下拉列表中选择各种复选框的功能。有样式的方法吗？

Answer 1

我遇到了同样的问题，我通过结合使用ToggleButton和Popup（而不是使用ComboBox）来解决了这个问题

注意：未测试

<ToggleButton x:Name="filterButton" />
<Popup x:Name="popup" 
    AllowsTransparency="True" 
    StaysOpen="False"
    PlacementTarget="{Binding ElementName=filterButton}"
    IsOpen="{Binding ElementName=filterButton,Path=IsChecked,Mode=TwoWay}">
    <ItemsControl ItemsSource="{Binding HeaderList}">
        <ItemsControl.ItemTemplate>
            <DataTemplate>
                <StackPanel Orientation="Horizontal">
                    <CheckBox IsChecked="{Binding IsChecked}"/>
                    <TextBlock Text="{Binding HeaderName}"/>
                </StackPanel>
            </DataTemplate>                                    
        </ItemsControl.ItemTemplate>
    </ItemsControl>
</Popup>

Answer 2

您可以尝试在selectionchangedchanged事件中将组合框的selectedindex设置为-1

//
//  UITextFiled+fixspace.swift
//  anbaobao
//
//  Created by 荆文征 on 2018/11/9.
//  Copyright © 2018 com.baimaodai. All rights reserved.
//

import UIKit

extension UITextField {
    /// Runtime 键
    private struct AssociatedKeys {

        static var toggleState: UInt8 = 0
    }

    /// 是否已经修复 右侧问题
    private var isFixedRightSpace: Bool {
        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.toggleState) as? Bool ?? false
        }
        set(newValue) {
            objc_setAssociatedObject(self, &AssociatedKeys.toggleState, newValue, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
        }
    }

    open override func hitTest(_ point: CGPoint, with event: UIEvent?) -> UIView? {

        if self.textAlignment == .right && !isFixedRightSpace {
            self.isFixedRightSpace = true
            self.addTarget(self, action: #selector(replaceNormalSpacesWithNonBreakingSpaces(textFiled:)), for: UIControl.Event.editingChanged)
        }

        return super.hitTest(point, with: event)
    }

    @objc func replaceNormalSpacesWithNonBreakingSpaces(textFiled: UITextField) {

        if textFiled.markedTextRange == nil && textFiled.text?.contains(find: " ") ?? false {

            let editRange = selectedTextRange
            textFiled.text = textFiled.text?.replacingOccurrences(of: " ", with: "\u{00a0}")
            selectedTextRange = editRange
        }
    }
}

在组合框中禁用下拉菜单的选择

2 个答案: