iOS - 在 swift 3 中打印和存储字典数组

Question

在我的项目中，我有一组字典:

var list = [[String: Any]] ()

简单来说，我所做的就是从 URL 下载 JSON 文件

//        json parsing 2
        let url:String = "https://jsonplaceholder.typicode.com/users"
        let urlRequest = URL(string: url)
        URLSession.shared.dataTask(with: urlRequest!, completionHandler: {(data, response, error) in
            if(error != nil)
            {
                print(error.debugDescription)
            }else{
                do {
                    self.list = try JSONSerialization.jsonObject(with: data!, options: .allowFragments)
                        as! [[String: Any]]
                    OperationQueue.main.addOperation {
                        self.tableView.reloadData()
                    }
                }catch let error as NSError{
                    print(error)
                }
            }
        }).resume()

现在，在列表(这是一个字典数组)中，我拥有了我感兴趣的所有数据。但是如果我想挑选一个值，或者打印 list 的整个内容，我该怎么办？

EDIT: also, I can simplify the structure and do not use an array of dictionaries, but something simpler?

Answer 1

或者你可以使用归档

import Foundation

class UserDataManager {

var documentsURL: NSURL?
var fileURL:NSURL?

func setFileURL(file: String) {
    documentsURL = FileManager.default.urls(for: .documentDirectory,
                                                   in: .userDomainMask)[0] as NSURL?
    fileURL = documentsURL!.appendingPathComponent(file) as NSURL?

}

func write(file: String, mDict: NSDictionary) {
    setFileURL(file: file)
    let data : NSData = NSKeyedArchiver.archivedData(withRootObject: mDict) as NSData
    if let fileAssigend = fileURL {
        data.write(to: fileAssigend as URL, atomically: true)
    }
}

func read(file: String) -> NSDictionary {
    setFileURL(file: file)

    var data:NSData?
    if let url = fileURL {
        data =  NSData(contentsOf: url as URL)
        if let result = data {
            return NSKeyedUnarchiver.unarchiveObject(with: result as Data) as! NSDictionary
        }
    }

    let dict = NSDictionary()

    return dict
}
}

并与它一起使用

写:

        let userDataManager = UserDataManager()
        userDataManager.write(file: "userDataDict", mDict: responseObject)

阅读:

        let userDataManager = UserDataManager()
        let userDataDict = userDataManager.read(file: "userDataDict")