用Swift 3parsingJSON

我一直试图让这个工作两个星期。 它正在与Swift 2的iOS 9上工作，但现在这似乎并没有任何理由的工作。 我已经添加了print("[DEBUG] I was here 1/2/3/4")来debugging代码，打印出来的是[DEBUG] I was here 1 。 有任何想法吗？ 它让我疯狂。

 func downloadData() { //clear the arrays arrayPosts = [String]() arrayLinks = [String]() arrayConditions = [String]() arrayIDs = [String]() //debug print("[DEBUG] I was here: 1") //baseURL is a string with URL to JSON Endpoint let url = URL(string: baseURL) URLSession.shared.dataTask(with:url!, completionHandler: {(data, response, error) in if error != nil { print("[ERROR] [DEBUG] Error with connection: \(error)") } else { do { //debug print("[DEBUG] I was here: 2") if let json = try JSONSerialization.jsonObject(with: data!, options:[.mutableContainers, .allowFragments]) as? [[String: Any]] { for item in json { //debug print("[DEBUG] I was here: 3") if let startTime = item["current_time"] as? Int { if self.defaults.integer(forKey: "startTime") == 0 { self.defaults.set(startTime, forKey: "startTime") } } if let posts = item["posts"] as? [[String: AnyObject]] { //debug print("[DEBUG] I was here: 4") for post in posts { if let text = post["text"] as? String { if let condition = post["conditions"] as? String{ if let url = post["url"] as? String { if let id = post["id"] as? String { self.arrayPosts.append(text) self.arrayConditions.append(condition) self.arrayLinks.append(url) self.arrayIDs.append(id) } } } } } } } } } catch { print("[ERROR] [DEBUG] Something went wrong during data download from the server.") } } }).resume() } 

这里是JSON数据以防万一：

 { "status": "ok", "num_results": "4", "current_time": 1474386061, "user_time": 0, "posts": [ { "text": "If your shirt isn't tucked into your pants, then your pants are tucked into your shirt.", "conditions": "4", "url": "0", "time": "0", "id": "108" }, { "text": "Veteran Kills Himself in Parking Lot of VA Hospital on Long Island", "conditions": "6", "url": "http://www.nytimes.com/2016/08/25/nyregion/veteran-kills-himself-in-parking-lot-of-va-hospital-on-long-island.html", "time": 1472076000, "id": "1472076000" }, { "text": "Leaked Script Shows What Advisers Want Donald Trump to Say at Black Church", "conditions": "6", "url": "http://www.nytimes.com/2016/09/02/us/politics/donald-trump-black-voters-wayne-jackson.html", "time": 1472767200, "id": "1472767200" }, { "text": "Creepy Clown Sightings in South Carolina Cause a Frenzy", "conditions": "6", "url": "http://www.nytimes.com/2016/08/31/us/creepy-clown-sightings-in-south-carolina-cause-a-frenzy.html", "time": 1472594400, "id": "1472594400" } ] } 

Answer 1

尝试下面的代码：

 import UIKit class ViewController: UIViewController { var arrayPosts = [String]() var arrayLinks = [String]() var arrayConditions = [String]() var arrayIDs = [String]() override func viewDidLoad() { super.viewDidLoad() self.downloadData() } func downloadData() { let url = NSURL(string: "http://getmydetails.pe.hu/test/parsejsonswift3.php") //Provided JSON data on my server. i don't know how longer it is present there!. let request = NSMutableURLRequest(url: url! as URL) let task = URLSession.shared.dataTask(with: request as URLRequest) { data,response,error in guard error == nil && data != nil else { print("Error:",error) return } let httpStatus = response as? HTTPURLResponse if httpStatus!.statusCode == 200 { if data?.count != 0 { let responseString = try! JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary //because JSON data started with dictionary. Not an array let status = responseString["status"] as! String if status == "ok" { print("Status is :", status) let timevar = responseString["current_time"] //not specified as String or Int print(String(describing: timevar)) // print by converting anyobject to string if let posts = responseString["posts"] as? [AnyObject] // posts started with array { for post in posts { let text = post["text"] as! String //specify as String print(text) let condition = post["conditions"] as! String let url = post["url"] as! String let id = post["id"] as! String DispatchQueue.main.sync { self.arrayPosts.append(text) self.arrayConditions.append(condition) self.arrayLinks.append(url) self.arrayIDs.append(id) //optional to check self.afterJSON() } } } else { print("I could not find post array") } } else { print("Status is not Okay!") } } else { print("No data got from url!") } } else { print("error httpstatus code is :",httpStatus!.statusCode) } } task.resume() } func afterJSON() { print("Posts are:\n\t\t",arrayPosts) print("Conditions are:\n\t\t",arrayConditions) print("Links are:\n\t\t",arrayLinks) print("ID's are:\n\t\t",arrayIDs) } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } } 

输出就像下面的截图一样，

如果你迷惑，那么看看我的video是给你的。

如有疑问，请在下面评论：D

Answer 2

 func downloadData() { //clear the arrays arrayPosts = [String]() arrayLinks = [String]() arrayConditions = [String]() arrayIDs = [String]() //debug print("[DEBUG] I was here: 1") //baseURL is a string with URL to JSON Endpoint let url = URL(string: baseURL) let session = URLSession.shared let task = session.dataTask(with: url!) { (data:Data?, response:URLResponse?, error:Error?) in if error != nil { print("[ERROR] [DEBUG] Error with connection: \(error)") } else { do { //debug print("[DEBUG] I was here: 2") if let json = try JSONSerialization.jsonObject(with: data!, options:[.mutableContainers, .allowFragments]) as? [[String: Any]] { for item in json { //debug print("[DEBUG] I was here: 3") if let startTime = item["current_time"] as? Int { if self.defaults.integer(forKey: "startTime") == 0 { self.defaults.set(startTime, forKey: "startTime") } } if let posts = item["posts"] as? [[String: AnyObject]] { //debug print("[DEBUG] I was here: 4") for post in posts { if let text = post["text"] as? String { if let condition = post["conditions"] as? String{ if let url = post["url"] as? String { if let id = post["id"] as? String { self.arrayPosts.append(text) self.arrayConditions.append(condition) self.arrayLinks.append(url) self.arrayIDs.append(id) } } } } } } } } } catch { print("[ERROR] [DEBUG] Something went wrong during data download from the server.") } } } task.resume() } 

Answer 3

谢谢你，我遵循你的代码得到的数据））

  func getJSON(){ let wUrl = "http://api.fixer.io/latest" let Url = NSURL(string: wUrl) let request = NSMutableURLRequest(url: Url! as URL) let task = URLSession.shared.dataTask(with: request as URLRequest){ data, response, error in guard error == nil && data != nil else { print("Error:", error ?? "some error") return } let httpStatus = response as? HTTPURLResponse if httpStatus!.statusCode == 200 { if data?.count != 0 { let resposeString = try! JSONSerialization.jsonObject(with: data!, options: .allowFragments) as! NSDictionary let base = resposeString["base"] as? String print(base ?? "") let date = resposeString["date"] as? String print(date ?? "") let rates = resposeString["rates"] as! Dictionary<String, AnyObject> for (key, value) in rates{ print("\(key)->\(value)") } } else { print("Data is emty") } } else { print("error httpStatus code: ", httpStatus?.statusCode ?? "") } };task.resume() } 

Answer 4

我find了解决scheme。 我将代码移到了后台队列中。 解决了这个问题。