ios - Monotouch 从另一个类更改 UIImageView 图像

Question

我正在尝试从另一个类更新图像视图（Xcode 的一个出口），但它没有用。

应用代理：

public UIImageView imageviewLoanInputTabs 
{
    get;
    private set;
}

public override bool FinishedLaunching (UIApplication app, NSDictionary options)
{
    imageviewLoanInputTabs = new UIImageView ();
    return true;
}

另一类：

var imageObjOutraClass = (AppDelegate) UIApplication.SharedApplication.Delegate;
imageObjOutraClass.imageviewLoanInputTabs.Image = (UIImage.FromBundle ("image11.png"));

Answer 1

操纵 s 没有什么特别的技巧UIImageView。试试下面的代码：

using System;
using System.Collections.Generic;
using System.Linq;
using MonoTouch.Foundation;
using MonoTouch.UIKit;
using System.Drawing;
using MonoTouch.CoreGraphics;

namespace SingleFileSolution
{
    public class ContentView : UIView
    {
        public ContentView Companion { get; set; }
        public UIImage Image { 
            get
            {
                return imageView.Image;
            }
            set 
            {
                imageView.Image = value;
            } 
        }

        private UIImageView imageView;

        public ContentView(UIColor fillColor, UIImage initialImage)
        {
            this.BackgroundColor = fillColor;

            imageView = new UIImageView(new RectangleF(10, 60, initialImage.Size.Width, initialImage.Size.Height));
            imageView.Image = initialImage;
            AddSubview(imageView);

            UIButton swapButton = UIButton.FromType(UIButtonType.RoundedRect);
            swapButton.SetTitle("Swap Image", UIControlState.Normal);
            swapButton.TouchUpInside += (sender, e) => {
                if(Companion != null)
                {
                    var tmp = Companion.Image;
                    Companion.Image = this.Image;
                    this.Image = tmp;
                }
            };

            swapButton.Frame = new RectangleF(10, 10, 100, 44);
            AddSubview(swapButton);
        }

    }


    public class SimpleViewController : UIViewController
    {
        public SimpleViewController() : base ()
        {
        }

        public override void DidReceiveMemoryWarning()
        {
            base.DidReceiveMemoryWarning();
        }

        public override void ViewDidLoad()
        {
            var view1 = new ContentView(UIColor.Blue, UIImage.FromFile("image1.jpg"));
            var view2 = new ContentView(UIColor.Red, UIImage.FromFile("image2.jpg"));

            view1.Frame = new RectangleF(0, 0, UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Height / 2);
            view2.Frame = new RectangleF(0, UIScreen.MainScreen.Bounds.Height / 2, UIScreen.MainScreen.Bounds.Width, UIScreen.MainScreen.Bounds.Height / 2);

            view1.Companion = view2;
            view2.Companion = view1;

            var view = new UIView(new RectangleF(new PointF(0, 0), UIScreen.MainScreen.Bounds.Size));
            view.AddSubview(view1);
            view.AddSubview(view2);

            this.View = view;
        }
    }

    [Register ("AppDelegate")]
    public  class AppDelegate : UIApplicationDelegate
    {
        UIWindow window;
        SimpleViewController svController;
        UINavigationController navController;

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

            svController = new SimpleViewController();
            window.RootViewController = svController;

            window.MakeKeyAndVisible();

            return true;
        }
    }

    public class Application
    {
        static void Main(string[] args)
        {
            UIApplication.Main(args, null, "AppDelegate");
        }
    }
 }