Xamarin 导航栏隐藏汉堡菜单 [英] Xamarin Navigation Bar Hide Hamburger Menu

问题描述

我需要隐藏某些页面上的汉堡菜单，但仍会在导航栏中显示信息.我不知道有什么方法可以做到这一点.

另外，我需要导航栏固定在屏幕顶部，但是当键盘弹出时它会被切断.

我该怎么办?

解决方案

I need to hide the hamburger menu on certain pages but still display information in then navbar. I don’t know of any way to accomplish this.

Also, I need the navbar to stay fixed to the top of the screen but it’s getting cut off when the keyboard pops up.

How can I go about this?

解决方案

FlyoutPage.ShouldShowToolbarButton method is used to determine whether to show/hide hamburger icon , and it is triggered every time when selecting pages.

We can define a bool field ,change its value when directing to specific pages.

FlyoutPage

 public override bool ShouldShowToolbarButton()
        {
            return showIcon;
        }

        private bool showIcon = true;

        private void ListView_ItemSelected(object sender, SelectedItemChangedEventArgs e)
        {
            var item = e.SelectedItem as FlyoutPage1FlyoutMenuItem;
            if (item == null)
                return;

            var page = (Page)Activator.CreateInstance(item.TargetType);
            page.Title = item.Title;

            Detail = new NavigationPage(page);
            IsPresented = false;

            FlyoutPage.ListView.SelectedItem = null;


            //add this logic
            showIcon = (item.Id == 1) ? false : true;   //only the second page do not show hamburger icon
        }

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