On the iPhone (though I imagine it's an equally valid question in Cocoa) I have a UIScrollView around a UIView backed by a CATiledLayer. The way it works by default is to load any uncached/unfetched tiles when my viewport scrolls over a blank section of the CATiledLayer.On the iPhone (though I imagine it's an equally
阅读背景：
在CATiledLayer中预加载/预先显示磁贴？
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