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frame—Use this to animate position and size changes for the view. ,框架,可以视图动态改变大小和位置 -
bounds—Use this to animate changes to the size of the view. ,可以改变视图的大小 -
center—Use this to animate the position of the view. ,可以改变视图的位置 -
transform—Use this to rotate or scale the view. ,可以改变视图的比例和旋转 -
alpha—Use this to change the transparency of the view. ,可以改变视图的透明度 -
backgroundColor—Use this to change the background color of the view. ,可以改变视图的背景颜色 -
contentStretch—Use this to change how the view’s contents stretch. ,可以拉伸视图的内容