UIMenuController不显示 [英] UIMenuController not showing up

问题描述

我正在尝试创建一个自定义UIMenuController，并在我的视图中显示它。这里是我的代码：

I'm trying to create a custom UIMenuController and display it in my view. Here's my code:

UIMenuController *menuController = [UIMenuController sharedMenuController];
    UIMenuItem *listMenuItem = [[UIMenuItem alloc] initWithTitle:@"List" action:@selector(addList:)];

    [menuController setMenuItems:[NSArray arrayWithObject:listMenuItem]];
    [menuController setTargetRect:CGRectMake(50.0, 50.0, 0, 0) inView:self.view];
    [menuController setMenuVisible:YES animated:YES];

    [listMenuItem release];

没有错误或异常，但菜单控制器不显示。

There are no errors or exceptions, but the menu controller just doesn't show up.

推荐答案

您需要做三件事：

1. 您需要致电
   
2. 您的视图或视图控制器需要的视图或视图控制器。
实施 -canBecomeFirstResponder （返回是）。

3. （可选）您的视图或视图控制器可以实施 -canPerformAction：action withSender：sender 以个别显示/隐藏菜单项。

1. You need to call -becomeFirstResponder on the view or view controller.
2. Your view or view controller needs to implement -canBecomeFirstResponder (returning YES).
3. Optionally, your view or view controller can implement -canPerformAction:action withSender:sender to show/hide menu items on an individual basis.

这篇关于UIMenuController不显示的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！