问题描述
在我的一个 Objective-C 类中，我有一个 UIViewController 类型的属性，我将如何在 Swift 中表示它?我需要从 UIViewController 和 UIProfileListHeaderDelegate 访问属性和方法.
In one of my Objective-C clases, I have a property of type UIViewController<UIProfileListHeaderDelegate>, how would I represent this in Swift? I need to access properties and methods from both UIViewController and UIProfileListHeaderDelegate.
谢谢！
推荐答案
处理这个问题的快速方法是定义一个协议，其中包含来自 UIViewController 的相关方法，并让您的 UIProfileListHeaderDelegate 继承自那个.
The swift way to handle this is to define a protocol that includes the relevant methods from UIViewController and have your UIProfileListHeaderDelegate inherit from that.
用你关心的方法定义一个协议:
Define a protocol with the methods you care about:
protocol ViewControllerSubset {
var view:UIView!
}
声明 UIViewController 实现了协议，不需要实际实现任何东西，因为它已经存在了
Declare that UIViewController implements the protocol, don't need to actually implement anything because it's already there
extension UIViewController : ViewControllerSubset {}
继承你的协议
protocol UIProfileListHeaderDelegate : ViewControllerSubset
你走吧.
如果你不想改变你的协议的层次结构(或者不能因为它是一个系统协议)你可以定义一个包含两个协议的协议)
If you don't want to change the hierarchy of your protocol (or can't because it's a system protocol) you can define a protocol that contains both protocols)
protocol EquatableAndComparable : Equatable, Comparable { }
这篇关于Swift - 具有类型和协议的属性的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！