例如，您可以建立用来绘制按钮背景的笔刷不透明度动画。

For example, you could animate the opacity of a brush used to paint a button's background.

youdao

打开动画窗口。第一帧将两个文字的图层都隐藏在蒙版后面，将手机信号线的透明度减少到50%。

Open animation window. For the first frame let the both text layers be hidden behind their masks. Reduce the opacity of radial waves to 50%.

youdao

打开动画窗口。首先选出最暗色的图层保留将其他图层进行隐藏，选中圆圈层，将其透明度设置为10%。

Open animation window. For the first frame hide all the layers except the most dark one. Select the circle layer and reduce the opacity to 10%.

youdao