WPF 打字效果

利用 StringAnimationUsingKeyFrames：

 

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public ChatGPTWindow()        {            InitializeComponent();            txt1.Text = "";//Textblock control            TypewriteTextblock("我爱北京天安门,我爱祖国,我爱北京天安门,我爱祖国,我爱北京天安门,我爱祖国,我爱北京天安门,我爱祖国,我爱祖国我爱祖国我爱祖国", txt1);          }        private void TypewriteTextblock(string textToAnimate, TextBlock txt)        {              TimeSpan timeSpan = TimeSpan.FromSeconds(textToAnimate.Length/2);//相当于速度            Storyboard story = new Storyboard();            story.FillBehavior = FillBehavior.HoldEnd;            story.RepeatBehavior = RepeatBehavior.Forever;              DiscreteStringKeyFrame discreteStringKeyFrame;            StringAnimationUsingKeyFrames stringAnimationUsingKeyFrames = new StringAnimationUsingKeyFrames();            stringAnimationUsingKeyFrames.Duration = new Duration(timeSpan);              string tmp = string.Empty;            foreach (char c in textToAnimate)            {                discreteStringKeyFrame = new DiscreteStringKeyFrame();                discreteStringKeyFrame.KeyTime = KeyTime.Paced;                tmp += c;                discreteStringKeyFrame.Value = tmp;                stringAnimationUsingKeyFrames.KeyFrames.Add(discreteStringKeyFrame);            }            Storyboard.SetTargetName(stringAnimationUsingKeyFrames, txt.Name);            Storyboard.SetTargetProperty(stringAnimationUsingKeyFrames, new PropertyPath(TextBlock.TextProperty));            story.Children.Add(stringAnimationUsingKeyFrames);              story.Begin(txt);        }