ios - 你如何真正从 UIMenuController 中删除 Copy

Question

显然曾经有一个 easy way当您添加多个自定义菜单项时，防止“更多...”标 checkout 现在 UIMenuController 中。您只需要删除所有系统菜单项。甚至还有一个 workaround here因为还有复印工作。您只需使用不同的选择器实现自定义复制命令，然后覆盖 canPerformAction:withSender: 以不显示系统复制:

-(BOOL)canPerformAction:(SEL)action withSender:(id)sender 
{
    if (action == @selector(copy:))
       return NO;
    else
       // logic to show or hide other things
}

不幸的是，此方法不再有效(至少在 UIWebView 子类中)。 canPerformAction:withSender: 为除 copy: 之外的每个系统菜单项调用，因此结果是始终显示系统复制菜单项。这意味着如果您有多个自定义菜单项，它们总是隐藏在“更多...”后面

那么，有没有办法真正删除系统的复制项或一些替代方法来防止菜单项隐藏在“更多...”后面？

更新

这是我重写 canPerformAction:withSender 时得到的输出:请注意，该方法永远不会为“复制:”操作调用:

cannot perform action cut: with sender <UIMenuController: 0x7227d30>.
cannot perform action select: with sender <UIMenuController: 0x7227d30>.
cannot perform action selectAll: with sender <UIMenuController: 0x7227d30>.
cannot perform action paste: with sender <UIMenuController: 0x7227d30>.
cannot perform action delete: with sender <UIMenuController: 0x7227d30>.
cannot perform action promptForReplace: with sender <UIMenuController: 0x7227d30>.
cannot perform action _showMoreItems: with sender <UIMenuController: 0x7227d30>.
cannot perform action _setRtoLTextDirection: with sender <UIMenuController: 0x7227d30>.
cannot perform action _setLtoRTextDirection: with sender <UIMenuController: 0x7227d30>.
can perform action customCopy: with sender <UIMenuController: 0x7227d30>.
can perform action custom1: with sender <UIMenuController: 0x7227d30>.
cannot perform action custom2: with sender <UIMenuController: 0x7227d30>.
can perform action custom3: with sender <UIMenuController: 0x7227d30>.
can perform action custom4: with sender <UIMenuController: 0x7227d30>.
cannot perform action cut: with sender <UIMenuController: 0x7227d30>.
cannot perform action select: with sender <UIMenuController: 0x7227d30>.
cannot perform action selectAll: with sender <UIMenuController: 0x7227d30>.
cannot perform action paste: with sender <UIMenuController: 0x7227d30>.
cannot perform action delete: with sender <UIMenuController: 0x7227d30>.
cannot perform action promptForReplace: with sender <UIMenuController: 0x7227d30>.
cannot perform action _showMoreItems: with sender <UIMenuController: 0x7227d30>.
cannot perform action _setRtoLTextDirection: with sender <UIMenuController: 0x7227d30>.
cannot perform action _setLtoRTextDirection: with sender <UIMenuController: 0x7227d30>.

Answer 1

您链接到的技术似乎仍然有效。我用这些方法实现了一个 UIWebView 子类，但只出现了 A 和 B 项。

+ (void)initialize
{
    UIMenuItem *itemA = [[UIMenuItem alloc] initWithTitle:@"A" action:@selector(a:)];
    UIMenuItem *itemB = [[UIMenuItem alloc] initWithTitle:@"B" action:@selector(b:)];
    [[UIMenuController sharedMenuController] setMenuItems:[NSArray arrayWithObjects:itemA, itemB, nil]];
    [itemA release];
    [itemB release];
}

- (BOOL)canPerformAction:(SEL)action withSender:(id)sender
{
    BOOL can = [super canPerformAction:action withSender:sender];
    if (action == @selector(a:) || action == @selector(b:))
    {
        can = YES;
    }
    if (action == @selector(copy:))
    {
        can = NO;
    }
    NSLog(@"%@ perform action %@ with sender %@.", can ? @"can" : @"cannot", NSStringFromSelector(action), sender);
    return can;
}