Argument of '#selector' refers to instance method 'changeScale(byReactingTo:)' that is not exposed t

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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！

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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