如何删除 Swift 中的 UIMenuController 默认项

Question

我正在尝试删除项目查找 & 分享... 来自 UIMenuController。我将如何专门删除这两个并保留我的自定义一个。这是我到目前为止取得的成就：

override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)

        // add two custom menu items to the context menu of UIWebView (assuming in contenteditable mode)


        let menuItem1 = UIMenuItem(title: "My Button", action: #selector(myButtonSel))
        UIMenuController.shared.menuItems = [menuItem1]

    }

这是我的 canPerformAction：

  override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

        //let shareSelector: Selector = NSSelectorFromString("_share:")

        if webView?.superview != nil {
            if action == #selector(myButtonSel){
                return true
            }
        }

        return super.canPerformAction(action, withSender: sender)
    }

同样出于一些奇怪的原因，当我尝试删除所有默认项目并只保留我的自定义项时，它不起作用。这是我为此尝试的代码：

override func canPerformAction(_ action: Selector, withSender sender: Any?) -> Bool {

    //let shareSelector: Selector = NSSelectorFromString("_share:")

    if webView?.superview != nil {
        if action == #selector(myButtonSel){
            return true
        }
        else {

            return false
        }
    }

    return super.canPerformAction(action, withSender: sender)
}

即使我尝试删除所有其他项目并保留我的习惯，我也无法这样做。我所能做的就是添加我的自定义项。

Answer 1

我尝试了这个，但它通过子类化 WebView 并覆盖 canPerformAction 方法对我有用，我在其中手动删除了默认选项。

override func canPerformAction(_ action: Selector, withSender sender: AnyObject?) -> Bool {
    if action == #selector(cut(_:)) {
      return false
    }
    if action == #selector(paste(_:)) {
      return false
    }
    if action == #selector(select(_:)) {
      return false
    }
    if action == #selector(selectAll(_:)) {
      return false
    }
    ...

    return super.canPerformAction(action, withSender: sender)
  }

我参考了 Ike10 的回答，它对我有用。试一试。

Answer 2

Objective C 从 UIMenuController 中删除默认项的版本。默认项目是 UIResponderStandardEditActions 的一部分！要删除默认项，请确保创建 UITextField 或 UITextView 的子 class 以使该功能正常工作，否则在 UiViewController class 中将无法正常工作。

#import "CustomTextField.h"

@implementation CustomTextField



- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
if (action == @selector(captureTextFromCamera:) ||
    action == @selector(delete:) ||
    action == @selector(cut:) ||
    [NSStringFromSelector(action)  isEqualToString:@"_promptForReplace:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_transliterateChinese:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_insertDrawing:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_lookup:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_define:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_translate:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_addShortcut:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_accessibilitySpeak:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_accessibilitySpeakLanguageSelection:"] ||
    [NSStringFromSelector(action) isEqualToString:@"_share:"] )
{
    return  false;
}
NSLog(@"OPtion :- %@",NSStringFromSelector(action));

return [super canPerformAction:action withSender:sender];
}


@end

默认可用选项低于您要禁用的选项。

cut:
copy:
paste:
delete:
_promptForReplace:
_transliterateChinese:
_insertDrawing:
captureTextFromCamera:
_showTextStyleOptions:
_lookup:
_define:
_translate:
_addShortcut:
_accessibilitySpeak:
_accessibilitySpeakLanguageSelection:
_accessibilityPauseSpeaking:
_share:
makeTextWritingDirectionRightToLeft:
makeTextWritingDirectionLeftToRight:

swift 用户请转换。很容易转换。

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