swift - 如何获取结构类型的值？

Question

如何通过字符串获取结构类型的值？

func getField(action: myStruct, field:String) {
    labelAmount.text = action[field]
}

这是我的结构:

struct myStruct {
    var id: Int
    var name: String
    .
    .
    //many fields
}

我收到这个错误:

Value of type 'myStruct' has no subscripts

Answer 1

就像评论中已经提到的那样，您可以为此使用反射

func getField(action: myStruct, field:String) {
    let actionMirror = Mirror(reflecting: action)
    if let value = actionMirror.children.first(where: {$0.label == field}).map( {$0.value}) {
        labelAmount.text = String(describing: value)
    }
}

评论中建议的另一种解决方案是使用 KeyPath

func getField<T>(action: myStruct, path: KeyPath<myStruct, T>) {
    labelAmount.text = String(describing: action[keyPath: path])
}