UIMenuController 没有出现

问题描述

我正在尝试创建一个自定义 UIMenuController 并将其显示在我的视图中.这是我的代码:

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

你需要做三件事:

1. 你需要调用-becomeFirstResponder.
2. 您的视图或视图控制器需要实现 -canBecomeFirstResponder(返回YES).
3. 或者，您的视图或视图控制器可以实现 -canPerformAction:action withSender:sender 单独显示/隐藏菜单项.

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