Question

我试图在我的Navbar上添加一个NavigationItem，当我在我的设备上部署它时，它不会显示出来。

我认为它类似于xamarin网站上的教程。

有什么想法吗？

这是我的代码：

using System;
using UIKit;

namespace myNameSpace
{
    public class LinksPageController : UINavigationController
    {
        public LinksPageController ()
        {
            NavigationBar.BarTintColor = UIColor.FromRGB (183, 28, 28);
        }

        public override void ViewDidLoad ()
        {
            base.ViewDidLoad ();
            this.NavigationItem.SetRightBarButtonItem(
                new UIBarButtonItem(UIBarButtonSystemItem.Action, (sender,args) => {
                    UIAlertView alert = new UIAlertView("Add link!", "Enter the ID of the person you want to be linked with:", null, "Cancel", "OK");
                    alert.AlertViewStyle = UIAlertViewStyle.PlainTextInput;
                    alert.Show ();
                })
                , true);
        }

        public override void ViewWillAppear (bool animated)
        {
            base.ViewWillAppear (animated);
        }
    }
}

Answer 1

如何在将类按钮添加到navBar之前实例化它？可能是你丢失了实例指针.. ??

UIBarButtonItem * newButton;
public override void ViewDidLoad ()
    {
        base.ViewDidLoad ();

        newButton =  new UIBarButtonItem(UIBarButtonSystemItem.Action, (sender,args) => {
                UIAlertView alert = new UIAlertView("Add link!", "Enter the ID of the person you want to be linked with:", null, "Cancel", "OK");
                alert.AlertViewStyle = UIAlertViewStyle.PlainTextInput;
                alert.Show ();
            })

        this.NavigationItem.SetRightBarButtonItem(newButton, true);
    }

无法在TabController内的NavigatioNController中的Xamarin iOS中添加导航项

1 个答案: