大佬教程收集整理的这篇文章主要介绍了Swift 4.0 报错：Argument of '#selector' refers to instance method xxx，大佬教程大佬觉得挺不错的，现在分享给大家，也给大家做个参考。
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今天编译代码发现了这个问题，查了下，修正很简单在相关类前加：
@objcMembers
class JKWLoginVC: UIViewController
{
}
@objc func clickLoginBtn() {
}
As of Swift 4 you’ll start seeing the error “Argument of ‘#SELEctor’ refers to instance method ‘firstPage()’ that is not exposed to Objective-C”,along with the proposed fix of “Add ‘@objc’ to expose this instance method to Objective-C”. what this means is that the Swift method in question isn’t visible to Objective-C,which matters because UIBarButtonItem is Objective-C code.
While adding @objc to individual methods is a working solution,I expect most people will just shrug their shoulders and put @objcMembers before their class – that automatically exposes everything in the class to Objective-C,just like Swift 3 used to. So,modify the class deFinition to this:
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