想要实现一个协议，包含了一个属性
其它的类，要符合这个协议，表示就有对应属性变量了
用于传入一个可选择的列表中，把name（或title）属性，用来显示列表的值
但是去写：
protocol NamePrototol { var name:String } |
出错：
DropDownTextField.swift:20:9: Property in protocol must have explicit { get } or { get set } specifier
swift property protocol
Swift: setting an optional property of a protocol – Stack Overflow
Optional Computed Properties in Swift Protocols — Matthew Palmer
Protocols in Swift — Coding Explorer Blog
ios – Swift Property that conforms to a Protocol and Class – Stack Overflow
然后去实现：
protocol NameProtocol { // var name:String { get set } //get set means read and writable var name:String { get } //get means read-only } class UserRoleItem: NameProtocol { var id:String var name:String init(id:String = "", name:String = "") { self.id = id self.name = name } } |
即可。
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