iOS开发笔记-67:swift4-代理-protocol-op

错误：Method cannot be marked @objc because the type of the parameter 1 cannot be represented in Objective-C

@objc protocol JJViewDelegate: class {
    @objc optional func JJClicked(model: JJModel, isSelected: Bool)
}

swift4中代理方法可选需要在前面加@objc
然后在加玩@objc后还是有上面的报错，
这是因为JJModel没有加@objc
所以需要

@objc class JJModel: NSObject {
  }