[UWP小白日记-10]程序启动屏(ios解锁既视感)

讲一下

微软爸爸的开发者大会2016又暴了个表达式动画和Windows.UI.Composition的API,好叼的样子。
官方示例库GitHub
目前是懵逼状态,好复杂。脑细胞已经在地府排队了。

(有没有IOS解锁的既视感?)上图的效果是照搬了微软爸爸的代码实现的。示例项目中有一个SurfaceLoader.cs类这玩意完全可以复制到任何项目中使用

提示

当然我这里没有改Package.appxmanifest中SplashScreen图片的背景色,改到和扩展初始屏一致的颜色就没违和感了

这里有个坑爹的问题,在图上的背景色位置多次改颜色编译都不会修改为当前设置的颜色,还是前一次的颜色,得打开Package.appxmanifest在xml中修改,不知道是不是最新的更新导致的,以前没太注意。

不得不吐槽:你说你越更新越回去,简体中文版还在清单中变英文,搞的我都不确定是不是下成英文版了
搞的和以前windows mobile 10 上一样简体中文系统设置一水的英文,

准备

1.需要添加一个内裤:Win2D。
2.把示例中的SurfaceLoader.cs类复制到自己的项目中。

第一步修改过APP.xaml.cs中的OnLaunched方法

 if (rootFrame.Content == null)
{
    
   //rootFrame.Navigate(typeof(MainPage), e.Arguments);

    ExtendedSplashScreen ess = new ExtendedSplashScreen(e.SplashScreen);
    rootFrame.Content = ess;
}
    

看名字就知道这个是GIF中出现的大概是橘红色的启动屏,就是原来的启动屏的扩展(我无耻的连名字都照搬了

),
然后新建一个ExtendedSplashScreen.xaml页面,后退CS中的代码如下

        private Rect _splashImageBounds;

        public ExtendedSplashScreen(SplashScreen ss)
        {
            this.InitializeComponent();

            if (ss != null)
            {
                _splashImageBounds = ss.ImageLocation;
            }
        }

        private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            //创建MainPage
            MainPage mainPage = new MainPage(_splashImageBounds);
            //导航到MainPage
            var rootFrame = Window.Current.Content as Frame;
            if (rootFrame == null)
            {
                Window.Current.Content = rootFrame = new Frame();
            }

            rootFrame.Content = mainPage;
            }

现在到了MainPage.cs了然后复制示例代码中

MainPage构造函数

    
  SurfaceLoader.Initialize(ElementCompositionPreview.GetElementVisual(this).Compositor);
  
            //显示初始屏幕
            ShowCustomSplashScreen(imageBounds);

SurfaceLoader.Initialize(ElementCompositionPreview.GetElementVisual(this).Compositor);
这一句必须有,不然下面代码暴异常
CompositionDrawingSurface surface = await SurfaceLoader.LoadFromUri(new Uri("ms-appx:///Assets/SplashScreen.png"));

显示动画

        private async void ShowCustomSplashScreen(Rect imageBounds)
        {
            Compositor compositor = ElementCompositionPreview.GetElementVisual(this).Compositor;
            Vector2 windowSize = new Vector2((float)Window.Current.Bounds.Width, (float)Window.Current.Bounds.Height);


            //1.创建ContainerVisual实例填充背景色和图片;
            //2.设置中心缩放
            ContainerVisual cv = compositor.CreateContainerVisual();
            cv.Size = windowSize;
            cv.CenterPoint = new Vector3(windowSize.X, windowSize.Y, 0) * 0.5f;
            ElementCompositionPreview.SetElementChildVisual(this,cv);

            //创建sprite的背景色为APP的主题色
            SpriteVisual backgroundSprite = compositor.CreateSpriteVisual();
            backgroundSprite.Size = windowSize;
            backgroundSprite.Brush = compositor.CreateColorBrush((Application.Current.Resources["日间主色"] as SolidColorBrush).Color);
            cv.Children.InsertAtBottom(backgroundSprite);

            //创建包含初始屏图像的sprite的尺寸和位置
            CompositionDrawingSurface surface = await SurfaceLoader.LoadFromUri(new Uri("ms-appx:///Assets/SplashScreen.png"));
            SpriteVisual imageSprite = compositor.CreateSpriteVisual();
            imageSprite.Brush = compositor.CreateSurfaceBrush(surface);
            imageSprite.Offset = new Vector3((float)imageBounds.X, (float)imageBounds.Y, 0f);
            imageSprite.Size = new Vector2((float)imageBounds.Width, (float)imageBounds.Height);
            cv.Children.InsertAtTop(imageSprite);
        }

隐藏动画

   private void HideCustomSplashScreen()
        {
            ContainerVisual container = (ContainerVisual)ElementCompositionPreview.GetElementChildVisual(this);
            Compositor compositor = container.Compositor;

            // 设置缩放和动画
            const float ScaleFactor = 20f;
            TimeSpan duration = TimeSpan.FromMilliseconds(1200);
            LinearEasingFunction linearEase = compositor.CreateLinearEasingFunction();
            CubicBezierEasingFunction easeInOut = compositor.CreateCubicBezierEasingFunction(new Vector2(.38f, 0f), new Vector2(.45f, 1f));

            // 创建淡出动画
            ScalarKeyFrameAnimation fadeOutAnimation = compositor.CreateScalarKeyFrameAnimation();
            fadeOutAnimation.InsertKeyFrame(1, 0);
            fadeOutAnimation.Duration = duration;

            // Grid的动画
            Vector2KeyFrameAnimation scaleUpGridAnimation = compositor.CreateVector2KeyFrameAnimation();
            scaleUpGridAnimation.InsertKeyFrame(0.1f, new Vector2(1 / ScaleFactor, 1 / ScaleFactor));
            scaleUpGridAnimation.InsertKeyFrame(1, new Vector2(1, 1));
            scaleUpGridAnimation.Duration = duration;

            // 初始屏动画
            Vector2KeyFrameAnimation scaleUpSplashAnimation = compositor.CreateVector2KeyFrameAnimation();
            scaleUpSplashAnimation.InsertKeyFrame(0, new Vector2(1, 1));
            scaleUpSplashAnimation.InsertKeyFrame(1, new Vector2(ScaleFactor, ScaleFactor));
            scaleUpSplashAnimation.Duration = duration;

            // 设置Grid的中心缩放视觉
            Visual gridVisual = ElementCompositionPreview.GetElementVisual(MainFrame);
            gridVisual.Size = new Vector2((float)MainFrame.ActualWidth, (float)MainFrame.ActualHeight);
            gridVisual.CenterPoint = new Vector3(gridVisual.Size.X, gridVisual.Size.Y, 0) * .5f;


            
            // 创建一个视觉组,当改组所有视觉执行完后不再显示
            

            CompositionScopedBatch batch = compositor.CreateScopedBatch(CompositionBatchTypes.Animation);

            container.StartAnimation("Opacity", fadeOutAnimation);
            container.StartAnimation("Scale.XY", scaleUpSplashAnimation);
            gridVisual.StartAnimation("Scale.XY", scaleUpGridAnimation);

            batch.Completed += Batch_Completed;
            batch.End();

        }

动画完成

        private void Batch_Completed(object sender, CompositionBatchCompletedEventArgs args)
        {
            // 动画完成后处理自定义视觉效果
            ElementCompositionPreview.SetElementChildVisual(this, null);
        }

mainPage加载完成

private void Page_Loaded(object sender, RoutedEventArgs e)
        {
            MainFrame.Navigate(typeof(HomePage));
            HideCustomSplashScreen();
        }

最后这个叫Widonw UI Dev Labs的示例

SurfaceLoader.cs

哈哈又水了一波

posted @ 2016-09-19 15:05  Enious  阅读(1515)  评论(1编辑  收藏  举报