Swift 4.0 报错：Argument of '#selector' refers to instance method xxx

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Swift4中引入了@objcMembers属性，用于解决Swift方法无法被Objective-C访问的问题。当使用UIBarButtonItem等Objective-C代码时，需在相关类或方法前添加此属性，确保其可见性。

swfit 4 的新特性

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 
{
}

或者在方法名前做修改

@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: