Question

在我的项目中，我有一个带控制器的View，名为TaskOverviewView，只有一个NSTextField，我想像小工具一样使用它。在NSWindow，我有一个NSCustomView和NSScrollView。在展位上，我尝试使用addSubview（NSView）方法将TaskOverviewViewController视图的实例添加为Subview。虽然它适用于ScrollView，但是在CustomView上看不到窗口小部件。

代码：

TaskOverviewViewController的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using MonoMac.Foundation;
using MonoMac.AppKit;

    namespace GetTheMilk.MacGUI

{
    public partial class TaskOverviewViewController : MonoMac.AppKit.NSViewController
    {
        #region Constructors

        // Called when created from unmanaged code
        public TaskOverviewViewController (IntPtr handle) : base (handle)
        {
            Initialize ();
        }

        // Called when created directly from a XIB file
        [Export ("initWithCoder:")]
        public TaskOverviewViewController (NSCoder coder) : base (coder)
        {
            Initialize ();
        }

        // Call to load from the XIB/NIB file
        public TaskOverviewViewController () : base ("TaskOverviewView", NSBundle.MainBundle)
        {
            Initialize ();
        }

        // Shared initialization code
        void Initialize ()
        {
            _taskName = new NSTextField();
            _taskName.StringValue = "HUHUH";
        }

        #endregion

        //strongly typed view accessor
        public new TaskOverviewView View {
            get {
                return (TaskOverviewView)base.View;
            }
        }
    }
}

我的StartupWindow的控制器：

using System;
using System.Collections.Generic;
using System.Drawing;
using System.Linq;
using MonoMac.Foundation;
using MonoMac.AppKit;

namespace GetTheMilk.MacGUI
{
    public partial class StartupWindowController : MonoMac.AppKit.NSWindowController
    {
        #region Constructors

        // Called when created from unmanaged code
        public StartupWindowController (IntPtr handle) : base (handle)
        {
            Initialize ();
        }

        // Called when created directly from a XIB file
        [Export ("initWithCoder:")]
        public StartupWindowController (NSCoder coder) : base (coder)
        {
            Initialize ();
        }

        // Call to load from the XIB/NIB file
        public StartupWindowController () : base ("StartupWindow")
        {
            Initialize ();
        }

        // Shared initialization code
        void Initialize ()
        {

        }

        #endregion

        //strongly typed window accessor
        public new StartupWindow Window {
            get {
                return (StartupWindow)base.Window;
            }
        }

        partial void _ButtonClick(NSObject sender)
        {
            _Label1.StringValue = "Hello";
            TaskOverviewViewController widget = new TaskOverviewViewController();
            _cview.AddSubview(widget.View);
            _scrillView.AddSubview(widget.View);
        }
    }
}

Answer 1

问题与ScrollView和CustomView无关。相反，它与呼叫顺序相关。如果我切换它而不是ScrollView不能工作，而是CustomView。解决方案与问题相关，我在这里问：NullReferenceException when accessing GUI Components in Controllers constructor

不应将代码放入Initialize()方法，而应将其放入AwakeFromNib()方法。

.addSubview适用于NSScrollView，但不适用于NSCustomView

1 个答案: