UIMenuController不顯示在第二個UIViewController中

Question

我有兩個UIViewController，一個是主要的，從這個槽到第二個按鈕。在SecondView.m我有以下代碼：

- (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; 
} 

的按鈕鏈接爲「潤色內」，但是當我運行UIMenuController不出來。 完全相同的代碼在主UIViewController中工作。

感謝

Answer 1

如果我不缺什麼，我想你應該，例如，作爲一個子視圖添加sharedController.view您mainController.view，例如（假設`showpopup在你的主控制器定義）：

- (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]; 
} 

，或者你可以提出模態的sharedController（更換上述addSubview線）：

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

在任何情況下，在我看來， 「呈現」位缺失。