UIMenuController不显示的解决办法

- (void)pressme:(id)sender
{
    [self becomeFirstResponder]; // 用于UIMenuController显示，缺一不可

    UIMenuItem *flag = [[UIMenuItem alloc] initWithTitle:@"拷贝"action:@selector(copyContent:)];
    UIMenuItem *approve = [[UIMenuItem alloc] initWithTitle:@"@Ta"action:@selector(addFriend:)];
    UIMenuItem *deny = [[UIMenuItem alloc] initWithTitle:@"举报"action:@selector(reportContent:)];
    UIMenuController *mymenu = [UIMenuController sharedMenuController];
    [mymenu setMenuItems:[NSArray arrayWithObjects:flag, approve, deny, nil]];
    [mymenu setTargetRect:所点击的按钮Frame inView:按钮的父视图];
    YILog(@"self.btnContent.frame:%@",NSStringFromCGRect(btnContent.frame));
    YILog(@"menuItems:%@",mymenu.menuItems);
    
    [mymenu setMenuVisible:YES animated:YES];
    
//    UIWindow *window = [[UIApplication sharedApplication].delegate window];
//    if ([window isKeyWindow] == NO)
//    {
//        [window becomeKeyWindow];
//        [window makeKeyAndVisible];
//    }
}
// 用于UIMenuController显示，缺一不可
-(BOOL)canBecomeFirstResponder{
    
    return YES;
    
}
// 用于UIMenuController显示，缺一不可
-(BOOL)canPerformAction:(SEL)action withSender:(id)sender{
    
    if (action ==@selector(copyContent:) || action ==@selector(addFriend:)||
        
        action == @selector(reportContent:)){
        
        return YES;
        
    }
    
    return NO;//隐藏系统默认的菜单项
}