Swift-自动归档

注意:运行时是OC的,其实Swift``官方并不是太提倡, 需要在class前加上@objcMembers声明该对象是OC的,不然获取不了对象属性列表

使用

import UIKit

class ViewController: UIViewController {

    let p  = UserInfo()
    override func viewDidLoad() {
        super.viewDidLoad()
        p.name = "yusong"
        p.age = 20
//        p.professional = "ios"
        p.address = "jiaotukeji"
    }

   // MARK: - 归档
    @IBAction func archiveclick(_ sender: Any) {
        UserTool.saveUser(p)
    }
   // MARK: - 解档
    @IBAction func solutionFileClick(_ sender: Any) {
        let p = UserTool.getUser()
        guard let user = p else{
            print("文件不存在")
            return
        }
        print(user.name,user.address ,user.age ,user.professional)
    }
    // MARK: - 删档
    @IBAction func removeClick(_ sender: Any) {
    UserTool.removeUser()
    }
}

实现

import UIKit

@objcMembers class UserInfo: NSObject,NSCoding {
    // MARK: - 属性
    var name :String?
    var address :String?
    var professional:String = "123" // 给定初始值
    var age :Int = 0

    // MARK: - 初始方法
    override init() {
        super.init()
    }
    // MARK: - 归档
    func encode(with aCoder: NSCoder) {
        for Strname in getAllPropertys() {
            let value = self.value(forKey: Strname)
            aCoder.encode(value, forKey: Strname)
        }
    }
    // MARK: - 解档
    internal required init?(coder aDecoder: NSCoder){
        super.init()
        for Strname in getAllPropertys() {
            let value = aDecoder.decodeObject(forKey: Strname)
            //利用kvc给属性赋值
            setValue(value, forKeyPath: Strname)
        }
    }
    // MARK: - 获取属性数组
    func getAllPropertys()->[String]{
        // 这个类型可以使用CUnsignedInt,对应Swift中的UInt32
        var count: UInt32 = 0
        let properties = class_copyPropertyList(self.classForCoder, &count)
        var propertyNames: [String] = []
        // Swift中类型是严格检查的，必须转换成同一类型
        for i in 0..<Int(count) {
            // UnsafeMutablePointer<objc_property_t>是可变指针，因此properties就是类似数组一样，可以通过下标获取
            let property = properties![i]
            let name = property_getName(property)
            // 这里还得转换成字符串
            let strName =  String(cString: name)
            propertyNames.append(strName);
        }
        // 不要忘记释放内存，否则C语言的指针很容易成野指针的
        free(properties)
        return propertyNames;
    }
    // MARK: - 获取对应属性的值 没有侧返回nil
    func getValueOfProperty(property:String)->AnyObject?{
        let allPropertys = self.getAllPropertys()
        if(allPropertys.contains(property)){
            return self.value(forKey: property) as AnyObject
        }else{
            return nil
        }
    }
}
class UserTool{
    // MARK: - 归档路径设置
   static private var Path: String{
        let path = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).last!
        return (path as NSString).appendingPathComponent("account.plist")
    }
    /// 存档
    static func saveUser(_ user: NSObject){
        NSKeyedArchiver.archiveRootObject(user, toFile: Path)
    }
    /// 获取归档模型
    static func getUser()-> UserInfo? {
        let user = NSKeyedUnarchiver.unarchiveObject(withFile: Path) as? UserInfo
        return user
    }
    /// 删除归档
    static func removeUser() {
        if FileManager.default.fileExists(atPath: Path){
            try! FileManager.default.removeItem(atPath: Path) // 删除文件
        }else{
            
        }
    }
}

Dome