How can I add a Dialog View Controller as a Subvie

问题:

I have looked around the web for some time looking for any resources on this topic and have come up with nothing that solves my dilemma.

I have a dialog view controller and its root is simply displaying a list of strings similar to how the iphone music song scrollable view is laid out. What I need is a subview located at the top of the screen and the scrollable DVC below it. I need to the top view to be always in view while the user can scroll through the root element because the top view will be holding statistics.

I have tried adding a subview but it simply overlaps the dvc below it, and I have not been able to figure out a way to add a dvc as a subview to a UIView.

Any help would be much appreciated.

回答1:

What is needed to achieve this is a single root view controller that hosts two subview controllers. One subview contains the statistics at the top of the window. The bottom subview contains a navigation controller that holds the dialog view.

using System;
using System.Collections.Generic;
using System.Linq;

using MonoTouch.Foundation;
using MonoTouch.UIKit;
using MonoTouch.Dialog;
using System.Drawing;

namespace delete201205203
{
    [Register ("AppDelegate")]
    public partial class AppDelegate : UIApplicationDelegate
    {
        UIWindow window;
        MyUIViewController _mvc;

        public override bool FinishedLaunching (UIApplication app, NSDictionary options)
        {
            window = new UIWindow (UIScreen.MainScreen.Bounds);

            _mvc = new MyUIViewController ();

            window.RootViewController = _mvc;
            window.MakeKeyAndVisible ();

            return true;
        }
    }

    public class MyUIViewController : UIViewController
    {
        MyDialogViewController _dvc;
        UINavigationController _nav;
        StatisticsViewController _statistics;

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

            var root = new RootElement ("Root") {
                new Section ("Section") {
                    new EntryElement ("caption", "placeholder", ""),
                    new RootElement ("Root 2") {
                        new Section ("Section") {
                            new EntryElement ("caption", "placeholder", ""),
                            new StringElement ("Back", () => {
                                _nav.PopViewControllerAnimated (true);  
                            })
                        }
                    }
                }
            };

            _dvc = new MyDialogViewController (root);
            _nav = new UINavigationController (_dvc);
            _nav.SetNavigationBarHidden (true, false);
            _nav.View.Frame = new RectangleF (0, 70f,
                                              this.View.Bounds.Width, 
                                              this.View.Bounds.Height -70f);

            _statistics = new StatisticsViewController ();
            _statistics.View.Frame = new RectangleF (0, 0,
                                              this.View.Bounds.Width, 
                                              70f);

            this.AddChildViewController (_nav);
            this.View.AddSubview (_nav.View);

            this.AddChildViewController (_statistics);
            this.View.AddSubview (_statistics.View);
        }

        public override void ViewWillLayoutSubviews ()
        {
            base.ViewWillLayoutSubviews ();
            _nav.View.Frame = new RectangleF (0, 70f,
                                              this.View.Bounds.Width, 
                                              this.View.Bounds.Height -70f);

            _statistics.View.Frame = new RectangleF (0, 0,
                                              this.View.Bounds.Width, 
                                              70f);
        }

        public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
        {
            return true;
        }
    }

    public class StatisticsViewController : UIViewController
    {
        UILabel _label;
        public override void ViewDidLoad ()
        {
            base.ViewDidLoad ();
            this.View.BackgroundColor = UIColor.White;

            _label = new UILabel (new RectangleF (this.View.Bounds.Width * .5f - 50f,
                                                  this.View.Bounds.Height * .5f -10f,
                                                  100f, 20f));
            _label.AutoresizingMask = UIViewAutoresizing.FlexibleMargins;

            _label.Text = "statistics";
            this.View.AddSubview (_label);

        }

        public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
        {
            return true;
        }
    }

    // This overrde is needed to ensure the pop view animation  
    // works correctly in landscape mode
    public class MyDialogViewController : DialogViewController
    {
        public MyDialogViewController (RootElement root) : base (root) {}
        public override bool ShouldAutorotateToInterfaceOrientation (UIInterfaceOrientation toInterfaceOrientation)
        {
            return true;
        }   
    }
}