Xcode 5中不需要Quartz Core Import？ [英] Quartz Core Import not required in Xcode 5?

问题描述

今天偶然发现了这一点。如果我尝试访问 CALayer 而不导入< QuartzCore / QuartzCore.h> ，我会在Xcode 4.6中收到警告。但是在Xcode 5中工作正常。

Just stumbled across this today. I am getting warnings in Xcode 4.6 if I try to access the CALayer without importing <QuartzCore/QuartzCore.h>. The same however works fine in Xcode 5.

推荐答案

是，< QuartzCore / QuartzCore.h> 是自动包含的，
但这似乎比预期更多的副作用，因为
只是间接包含：

Yes, <QuartzCore/QuartzCore.h> is automatically included, but this seems to be more a side effect than intended, because it is included only indirectly:

• < UIKit / UIKit.h> 包含< UIKit / UISlider.h> ，


• ，< UIKit / UISlider.h> 包含< ; QuartzCore / QuartzCore.h> ，
  由于 UISlider 类中的新实例变量（ CAShapeLayer 类型）。

• <UIKit/UIKit.h> includes <UIKit/UISlider.h>,
• in the iOS 7 SDK, <UIKit/UISlider.h> includes <QuartzCore/QuartzCore.h>, due to new instance variables in the UISlider class (of the CAShapeLayer type).

此外，Xcode 5有一个新的构建设置Link Frameworks Automatically，这是由
默认开启（并需要新的模块功能），因此QuartzCore框架
也被添加到链接库中。

In addition, Xcode 5 has a new build setting "Link Frameworks Automatically", which is by default on (and requires the new "modules" feature), so that the QuartzCore framework is also added to the link libraries.

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