UIMenuController 不显示在第二个 UIViewController

Question

我有两个 UIViewController，一个是主要的，通过这个按钮你可以转到第二个。在 SecondView.m 我有以下代码：

    - (IBAction)showpopup:(id)sender {
    [self becomeFirstResponder];
    UIMenuController *sharedController = [UIMenuController sharedMenuController];
    UIMenuItem *x2 = [[UIMenuItem alloc] initWithTitle:@"2x2" action: @selector(mat)];
    UIMenuItem *x3 = [[UIMenuItem alloc] initWithTitle:@"3x3" action: @selector(mat)];
    UIMenuItem *x4 = [[UIMenuItem alloc] initWithTitle:@"4x4" action: @selector(mat)];
    UIMenuItem *x5 = [[UIMenuItem alloc] initWithTitle:@"5x5" action: @selector(mat)];

    NSArray *menuArray = [NSArray arrayWithObjects: x2,x3,x4,x5, nil];


    CGRect drawRect = [sender convertRect:[sender bounds] toView: self.view];
    [sharedController setTargetRect:drawRect inView: self.view];

    [sharedController setMenuItems:menuArray];
    [sharedController setMenuVisible:YES animated:YES];
    [sharedController setMenuItems: nil];
}

-(BOOL)canBecomeFirstResponder{
    return YES;
}

-(int)mat:(id)sender{
    return 0;
}

按钮被链接为“内部修饰”，但是当我运行 UIMenuController 时没有显示出来。 完全相同的代码在主 UIViewController 中工作。

谢谢

Answer 1

如果我没有遗漏任何东西，我认为您应该，例如，将您的 sharedController.view 作为子视图添加到您的 mainController.view，例如（假设在你的主控制器中定义了`showpopup）：

- (IBAction)showpopup:(id)sender {
    [self becomeFirstResponder];
    UIMenuController *sharedController = [UIMenuController sharedMenuController];
    ...
    [sharedController setMenuItems:menuArray];
    [sharedController setMenuVisible:YES animated:YES];
    [sharedController setMenuItems: nil];
    [self.view addSubview:sharedController.view];
}

或者您可以模态显示您的 sharedController（替换上面的 addSubview 行）：

[self presentViewController:sharedController animated:YES completion:nil];

无论如何，在我看来，“呈现”位丢失了。