Xcode 8 Objective-C类别警告 [英] Xcode 8 Objective-C category warning

问题描述

我正在使用Xcode 8和Swift 3.0。此错误消息的含义是什么？

I'm using Xcode 8 and Swift 3.0. What does this error message mean?

ld：警告：某些目标文件具有不兼容的Objective-C类别定义。某些类别元数据可能会丢失。所有包含Objective-C类别的文件都应使用相同的编译器构建。

ld: warning: Some object files have incompatible Objective-C category definitions. Some category metadata may be lost. All files containing Objective-C categories should be built using the same compiler.

推荐答案

我也是在 UIColor 扩展中有这个问题，我的应用程序完全由swift制作，除了一些使用Objective-c的框架，所以我在声明 var as @nonobjc ：

I also had this issue in a UIColor extension, my app is entirely made with swift except for some frameworks that use Objective-c so I have no problem in declaring the var as @nonobjc:

extension UIColor {
   @nonobjc static var lol: UIColor {
      return UIColor.red
   }
}

来自apple docs：

From the apple docs:

nonobjc属性告诉编译器使声明不可用在Objective-C代码中......

The nonobjc attribute tells the compiler to make the declaration unavailable in Objective-C code...

由于此代码对Objective-C不可用，警告消失。

Since this code is unavailable to Objective-C the warning disappears.

这篇关于Xcode 8 Objective-C类别警告的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！