Question

我目前正在实现一个UICollectionView来在我的应用程序中显示CoreData数据，我想使用ContextMenu为每个单元格添加“删除”功能。

在互联网上，我观察到许多页面能够在UITableView和UICollectionView的单元格中自定义UIMenuController，但我仍然无法显示我的MenuItem“删除”。

这是我的代码：

<?xml version="1.0" encoding="utf-8" ?>
<resources>

  <style name="MainTheme" parent="MainTheme.Base">
  </style>
  <!-- Base theme applied no matter what API -->
  <style name="MainTheme.Base" parent="Theme.AppCompat.Light.DarkActionBar">
    <!--If you are using revision 22.1 please use just windowNoTitle. Without android:-->
    <item name="windowNoTitle">true</item>
    <!--We will be using the toolbar so no need to show ActionBar-->
    <item name="windowActionBar">false</item>
    <!-- Set theme colors from http://www.google.com/design/spec/style/color.html#color-color-palette -->
    <!-- colorPrimary is used for the default action bar background -->
    <item name="colorPrimary">#2196F3</item>
    <!-- colorPrimaryDark is used for the status bar -->
    <item name="colorPrimaryDark">#1976D2</item>
    <!-- colorAccent is used as the default value for colorControlActivated
     which is used to tint widgets -->
    <item name="colorAccent">#FF4081</item>
    <!-- You can also set colorControlNormal, colorControlActivated
     colorControlHighlight and colorSwitchThumbNormal. -->
    <item name="windowActionModeOverlay">true</item>

    <item name="android:datePickerDialogTheme">@style/AppCompatDialogStyle</item>

    <!-- ********* CHECK HERE ********* -->
    <item name="android:actionBarSize">250dp</item>
  </style>

  <style name="AppCompatDialogStyle" parent="Theme.AppCompat.Light.Dialog">
     <item name="colorAccent">#FF4081</item>
  </style>
</resources>

的CollectionView：

private func config_menu()
{
    let menuItem = UIMenuItem(title: "Test", action: #selector(test(_:)))
    let menu = UIMenuController.shared
    menu.menuItems = [menuItem]
    menu.update()
}

@objc func test(_ sender: Any?)
{

}

有什么问题？

Answer 1

我找到了解决方案：D能够使用自定义MenuItems，有必要在单元格的子类中声明它们，这样::

class Cell_Prueba: UICollectionViewCell {


    override func awakeFromNib() {
        super.awakeFromNib()
    }

    override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {
        return (action == #selector(test(_:)))
    }

    @objc func test(_ sender: Any?)
    {
        //Do Any
    }
}

（已关闭）Swift - UICollectionView上下文菜单行

1 个答案: