ios - 从任何 VC 获取协议(protocol)定义的变量值

Question

协议(protocol)(我的协议(protocol)):-

 protocol myProtocol {
        var type:String { get set }
        var sub:String { get }
        var msg:String? { get set }
    }

类(myVC):-

class myVC: UIViewController, myProtocol {
    //Protocol Declarations
    var sub  = myTypes.type.rawValue
    var type = myTypes.type.getType()
    var msg :String?

.... }

扩展名:-

extension UIViewController
{
 func getData() {
        if self is myProtocol {
         let msg = self.msg

        } }
}

在“self.msg”处出现错误，提示 UIViewController 类型的值没有成员“sub”

我该怎么做？感谢您的帮助。

Answer 1

您需要做的就是在您的扩展类中再写一行代码。我刚刚对它进行了测试，它对我有用。这是我写的代码 -

extension UIViewController
{
    func getData() {
        if self is myProtocol {
            let x = self as! myProtocol
            let msg = x.msg
            print(x.msg)
        }
    }
}