Question

我有一个包含一些静态变量和属性的模型类。在运行时我可以获得属性;

let instance = entity.init()

let mirror = Mirror(reflecting:instance)

var propertyStrings = [String]()

for (propertyName, childMirror) in mirror.children {

}

但是我想把类的静态变量作为列表。那么如何获取静态变量的名称和值列表呢？这是我的模特班＆＃39;结构：

class ActionModel: NSObject {

static let kLastModified = "LastModified"
static let kEntityName = "EntityName"
static let kIdentifier = "Id"


var lastModified: Int64
var entityName: String?
var identifier : PrimaryKeyString

Answer 1

尚不支持通过反射获取类型属性。如果将类对象传递给初始化程序，则可以通过检查id的{{1}}来看到这一点：

displayStyle

Answer 2

您可以使用Objective-c运行时，尤其是函数class_copyPropertyList，它描述了类声明的属性。例如：

import Foundation

class Foo:NSObject {
    @objc static var prop1: String? = "Hello I am prop1!"
    @objc static var prop2: String? = "Hello I am prop2!"
}

var count: CUnsignedInt = 0
let methods = class_copyPropertyList(object_getClass(Foo.self), &count)!
for i in 0 ..< count {
    let selector = property_getName(methods.advanced(by: Int(i)).pointee)
    if let key = String(cString: selector, encoding: .utf8) {
        let res = Foo.value(forKey: key)
        print("name: \(key), value: \(res ?? "")")
    }
}

使用反射访问模型类的静态变量

2 个答案: