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