我开始在我的scrollview / clipview上使用图层来获得更好的滚动行为并实现了这个网站上的提示：
http://www.jwilling.com/optimized-scrolling-in-nstableview/
使用CAScrollLayer作为NSClipView子类的层。
我对scrollview的文档视图是一个集合视图，它为每个项目都有自己的图层（可能会更改，我在项目视图上调用canDrawSubviewsIntoLayer）
嗯，这一切都正常，直到您使用X关闭文档，然后单击停靠栏图标或创建新文档。除了工具栏工作正常之外，除了毛躁之外没有任何显示。
我应该说我的第一部分是NSSplitview是scrollview，但没有任何内容可以显示。有时候我会得到错误日志，但是如果我在xCode中运行它，一切都会正常工作，如果导出到.app就会出现故障。
<Error>: CGContextGetCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
<Error>: CGContextGetBaseCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
<Error>: CGContextGetDefaultUserSpaceToDeviceSpaceTransform: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
<Error>: CGContextGetCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
<Error>: CGContextGetBaseCTM: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
<Error>: CGContextGetDefaultUserSpaceToDeviceSpaceTransform: invalid context 0x0. This is a serious error. This application, or a library it uses, is using an invalid context and is thereby contributing to an overall degradation of system stability and reliability. This notice is a courtesy: please fix this problem. It will become a fatal error in an upcoming update.
只有在ClipView或Scrollview确实有图层时才会出现此错误。它不是由CAScrollLayer引起的，因为即使我只是在其中任何一个上设置了setWantsLayer：YES，它也会发生。
你们有什么提示给我吗？因为我没有得到这个，只要你创建一个新文档（这基本上是一个包含所有collectionview内容的新窗口），应用程序就可以正常运行而没有错误，但不是第一次？
先谢谢你们。我不知道如何解决这个问题。