Swift 如果定义一个具备某个 协议（Protocol）的 类（class）？ - V2EX
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Swift 如果定义一个具备某个 协议（Protocol）的 类（class）？

  •   
  •   wobuhuicode Apr 20, 2021 1657 views
    This topic created in 1852 days ago, the information mentioned may be changed or developed.
    class AView : UIView,ProtocolB{ } class BView : UIView,ProtocolB{ } let arr : UIView<ProtocolB>

    我的两个子 view 都具备 ProtocolB，我想用一个 UIView 数组去装这两个子 view 的实例。 可以这样写吗？

  • protocolb
  • UIView
  • class
  • view
    2 replies    2021-04-25 01:15:30 +08:00
    finab
        1
    finab  
       Apr 20, 2021
    或者可以这样？
    protocol ProtocolB: UIView {

    }

    class AView: UIView, ProtocolB {

    }
    class BView: UIView, ProtocolB {

    }

    let arr : [ProtocolB]

    arr.first?.backgroundColor = .white
    YYYeung
        2
    YYYeung  
       Apr 25, 2021
    限制协议实现的类型

    ```swift
    protocol ProtocolB where Self: UIView {}

    class AView: UIView, ProtocolB {}

    class BView: UIView, ProtocolB {}

    let arr: [UIView] = [AView(), BView()]
    ```
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