在Swift 4模式下使用Swift 3 @objc推断已弃用?

使用func调用@objc

func call(){

foo()

}

@objc func foo() {

}

在@wisekiddo所说的之上，您还可以在项目中修改您的构建设置。通过将SWIFT_SWIFT3_OBJC_INFERENCE = default设置为SWIFT_SWIFT3_OBJC_INFERENCE = default;对于你的构建风格(即调试和发布)，特别是如果你来自Xcode以外的其他环境

您可以尝试“Pod更新”和/或“颤振清理”

我也在xcode中设置了这个设置。

Objective-C界面设置如下:

我摆脱了这个警告通过改变“Swift 3 @objc推断”构建设置我的目标为“默认”。

从这篇文章中:

Before Swift 4, the compiler made some Swift declarations automatically available to Objective-C. For example, if one subclassed from NSObject, the compiler created Objective-C entry points for all methods in such classes. The mechanism is called @objc inference. In Swift 4, such automatic @objc inference is deprecated because it is costly to generate all those Objective-C entry points. When "Swift 3 @objc Inference" setting is set to "On", it allows the old code to work. However, it will show deprecation warnings that need to be addressed. It is recommended to "fix" these warnings and switch the setting to "Default", which is the default for new Swift projects.

更多信息请参考Swift提案。

Migrator不能识别所有需要@objc的函数 推断的Objective-C坦克标记为已弃用，以帮助您找到它们 •构建关于已弃用方法的警告 •运行过时的坦克时控制台消息

在Swift 4模式下使用Swift 3 @objc推断已弃用?

使用func调用@objc

func call(){

foo()

}

@objc func foo() {

}