iOS-在Swift 3中打印并存储字典数组 [英] iOS - Print and store array of dictionary in swift 3
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问题描述
在我的项目中,我有一系列的字典:
In my project I have an array of dictionaries:
var list = [[String: Any]] ()
很简单,我要做的是从URL下载JSON文件
Very briefly, what I do is download a JSON file from a URL
// 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(包含词典的数组)中,我拥有了所有感兴趣的数据。但是,如果我想选择一个值,或者打印 list 的全部内容,该怎么办?
Now, within the list (which is an array of dictionaries) I have all the data that interest me. But if I want to pick out a single value, or print the entire contents of list how am I supposed to do?
编辑:另外,我可以简化结构,而不使用字典
的数组,而是简单一些?
also, I can simplify the structure and do not use an array of dictionaries, but something simpler?
推荐答案
或者您可以使用存档
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
一起使用:
let userDataManager = UserDataManager()
userDataManager.write(file: "userDataDict", mDict: responseObject)
读取:
let userDataManager = UserDataManager()
let userDataDict = userDataManager.read(file: "userDataDict")
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