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                # 總結 ????這一章闡述了圖層的樹狀結構,說明了如何在iOS中由`UIView`的層級關系形成的一種平行的`CALayer`層級關系,在后面的實驗中,我們創建了自己的`CALayer`,并把它添加到圖層樹中。 ????在第二章,“圖層關聯的圖片”,我們將要研究一下`CALayer`關聯的圖片,以及Core Animation提供的操作顯示的一些特性。
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