Question

我遇到UINavigationController的问题。这是我正在使用的代码：

using System.Drawing;

using MonoTouch.Foundation;
using MonoTouch.UIKit;

namespace SalesOrderTest
{
    public partial class RootViewConroller : UIViewController
    {
        public RootViewConroller () : base ("RootViewConroller", null)
        {
            this.Title = NSBundle.MainBundle.LocalizedString ("Main", "Main");
            this.TabBarItem.Image = UIImage.FromBundle ("Images/first");

        }

        public override void DidReceiveMemoryWarning ()
        {
            // Releases the view if it doesn't have a superview.
            base.DidReceiveMemoryWarning ();

            // Release any cached data, images, etc that aren't in use.
        }

        public override void ViewDidLoad ()
        {

                base.ViewDidLoad ();


                this.chooseCustomerSearchButton.TouchUpInside += (sender, e) => {
                var single = new SecondViewController (); 

                this.NavigationController.PushViewController (single, true);

            };


            // Perform any additional setup after loading the view, typically from a nib.
        }

        public override void ViewDidUnload ()
        {
            base.ViewDidUnload ();

            // Clear any references to subviews of the main view in order to
            // allow the Garbage Collector to collect them sooner.
            //
            // e.g. myOutlet.Dispose (); myOutlet = null;

            ReleaseDesignerOutlets ();
        }

        public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
        {
            // Return true for supported orientations
            return true;
        }
    }
}

单击按钮后，收到以下错误消息：

未处理的异常：System.NullReferenceException：对象引用未设置为对象的实例 SalesOrderTest.RootViewConroller + C_ AnonStorey0＆LT;＆GT; M _0 （System.Object sender，System.EventArgs e）[0x00000] in /Users/Mac/Projects/SalesOrderPolarisnet/SalesOrderTest/RootViewConroller.cs:34 在MonoTouch.UIKit.UIControlEventProxy.Activated（）[0x00000]中 /Developer/MonoTouch/Source/monotouch/src/UIKit/UIControl.cs:30

UINavigationController的Monotouch问题

0 个答案: