JSON图像解析IOS Swift 3.0
对于iOS迅速开发，我是全新的。 我正在尝试使用动态数据/ url进行json图像解析，我尝试了没有结果来搜索在表视图或列表视图中显示数据和图像的示例，任何人都可以帮助我完成此任务吗？
以下是图像解析的以下链接
http://www.androidbegin.com/tutorial/jsonparsetutorial.txt
作为一个新手，我认为这个图书馆将减轻你的大部分工作，
- SwiftyJSON
语法是非常友好和简单的， if let语法和嵌套没有挣扎。例子用法用一条简单的线创建json let json = JSON(data : data)以及更多自定义数据类型。看看这个Lib
let rank = json["worldpopulation"][0]["rank"].int let country = json["worldpopulation"][0]["country"].string let flag = json["worldpopulation"][0]["flag"].string
func countriesResponseReceived(response : NSDictionary) { let arrCountries = (response.object(forKey: "worldpopulation")) as! NSArray for dict in arrCountries! { let dictData = dict as! NSDictionary let rank = dictData.object(forKey: "rank") as! NSInteger let country = dictData.object(forKey: "country") as! String let flag = dictData.object(forKey: "flag") as! String } }
Swift 3.0创建新的Xcode项目拿一个表视图创建tableViewCell文件创建NSObject类文件拿一个标签（国家名称）拿一个imageView（标志）放下右边的代码（注意：在启动代码前提到的地方）
ViewController代码
import UIKit class ViewController: UIViewController , UITableViewDelegate , UITableViewDataSource { @IBOutlet var imgTable: UITableView! var ArrayData:[Datad] = [] override func viewDidLoad() { super.viewDidLoad() service() // Do any additional setup after loading the view, typically from a nib. } override func didReceiveMemoryWarning() { super.didReceiveMemoryWarning() // Dispose of any resources that can be recreated. } func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int { return ArrayData.count } func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "CellDemo") as! ImageTableViewCell let objarr = ArrayData[indexPath.row] cell.lblContry.text = objarr.Country cell.imgflag.setImageFrom(imageURLString: objarr.Countryflag, completionHandler: { (complete, image, error) in }) return cell } func service() { let url = URL(string: "http://www.androidbegin.com/tutorial/jsonparsetutorial.txt") var urlRequest = URLRequest(url: url!, cachePolicy: .reloadIgnoringLocalAndRemoteCacheData, timeoutInterval: 60) urlRequest.httpMethod = "GET" let session = URLSession.shared let task = session.dataTask(with: urlRequest) { (data, response, errorresponce) in if errorresponce != nil { print(errorresponce?.localizedDescription ?? "Value Not Found") } else { do { if let dictionary = try JSONSerialization.jsonObject(with: data!, options: .mutableContainers) as? NSDictionary { DispatchQueue.main.async { for datacon in (dictionary.value(forKey: "worldpopulation") as! NSArray) { let cellonr = Datad(dictionary: datacon as! NSDictionary ) self.ArrayData.append(cellonr) self.imgTable.reloadData() } } } else { print("value not found") } } catch let error as Error! { print(error.localizedDescription) } } } task.resume() } }
TableView单元代码
import UIKit class ImageTableViewCell: UITableViewCell { @IBOutlet var lblContry: UILabel! @IBOutlet var imgflag: UIImageView! override func awakeFromNib() { super.awakeFromNib() // Initialization code } override func setSelected(_ selected: Bool, animated: Bool) { super.setSelected(selected, animated: animated) // Configure the view for the selected state } }
NSObject文件
import UIKit class Datad: NSObject { var Country:String! var Countryflag:String! init(dictionary:NSDictionary) { Country = (dictionary.value(forKey: "country") as! String) Countryflag = (dictionary.value(forKey: "flag") as! String) } }
复制这两个文件（注意下面2文件名不改变Strikly跟随）首先
ImageDownloadManager.swift
import Foundation import UIKit typealias DownloadHandler = (_ success: Bool, _ image: UIImage?, _ error: Error?) -> Void typealias DownloadProgressHandler = (_ totalBytesExpected : Int64, _ bytesDownloaded: Int64, _ error : Error?) -> Void private var kImageURLKey : String = "imageURLKey" extension UIImageView{ var imageURLId : String{ get{ return objc_getAssociatedObject(self, &kImageURLKey) as! String } set(newValue){ objc_setAssociatedObject(self, &kImageURLKey, newValue, .OBJC_ASSOCIATION_RETAIN_NONATOMIC) } } func setImageFrom(imageURLString : String, placeHolderImage: UIImage? = nil, completionHandler: DownloadHandler?) { if (imageURLString.characters.count > 0){ if ((placeHolderImage) != nil){ self.image = placeHolderImage; } self.imageURLId = imageURLString ImageDownloadManager.sharedManager.getImageFromURL(imageURLString: imageURLString) { (success : Bool, image : UIImage?, error :Error?) in if (success){ self.isUserInteractionEnabled = true self.updateImage(image: image!, imageUrl: imageURLString) } if ((completionHandler) != nil){ completionHandler!(success, image, error) } } } } func setImageFrom(imageURLString : String, placeHolderImage: UIImage? = nil, progressHandler: @escaping DownloadProgressHandler, completionHandler: DownloadHandler?) { if (imageURLString.characters.count > 0){ if ((placeHolderImage) != nil){ self.image = placeHolderImage; } self.imageURLId = imageURLString ImageDownloadManager.sharedManager.getImageFromURL(imageURLString: imageURLString, progessHandler: { (expectedBytes:Int64, downloadedBytes:Int64, error:Error?) in if error != nil { completionHandler!(false, nil, error) }else{ progressHandler(expectedBytes, downloadedBytes, nil) } }, completionHandler: { (success:Bool, image:UIImage?, error:Error?) in if (success){ self.updateImage(image: image!, imageUrl: imageURLString) } if ((completionHandler) != nil){ completionHandler!(success, image, error) } }) } } private func updateImage(image:UIImage, imageUrl:String) { if (imageUrl == imageURLId) { UIView.transition(with: self, duration: 0.4, options: .transitionCrossDissolve, animations: { self.image = image; }, completion: nil) } } }
的UIImageView + AsyncLoad.swift
import UIKit struct ImageDownloadInfo { let downloadURLString : String let downloadTask : URLSessionTask let progressHandler : DownloadProgressHandler? let completionHandler : DownloadHandler? } class ImageDownloadManager: NSObject { static let sharedManager : ImageDownloadManager = ImageDownloadManager() var imageLoaderQueue : [String:ImageDownloadInfo] = [:] var imageCache : NSCache = NSCache() lazy var downloadsSession : URLSession = URLSession(configuration: URLSessionConfiguration.default) lazy var downloadDelegateSession : URLSession = URLSession(configuration: URLSessionConfiguration.default, delegate: sharedManager, delegateQueue: OperationQueue.main) func getImageFromURL(imageURLString:String, completionHandler:@escaping DownloadHandler) { let cachedImage : UIImage? = imageCache.object(forKey: imageURLString as NSString) if cachedImage != nil { completionHandler(true, cachedImage, nil) }else { downloadImageFor(imageURLString: imageURLString, downloadHandler: completionHandler) } } func getImageFromURL(imageURLString:String, progessHandler: @escaping DownloadProgressHandler, completionHandler: @escaping DownloadHandler ){ let cachedImage : UIImage? = imageCache.object(forKey: imageURLString as NSString) if cachedImage != nil { progessHandler(1, 1, nil) completionHandler(true, cachedImage, nil) }else { downloadImageFor(imageURLString: imageURLString, progressHandler: progessHandler, completionHandler:completionHandler) } } private func downloadImageFor(imageURLString:String, downloadHandler: @escaping DownloadHandler) { var imageDownloadInfo: ImageDownloadInfo? = imageLoaderQueue[imageURLString] if imageDownloadInfo == nil { let imageLoaderTask = downloadsSession.dataTask(with: URL(string: imageURLString)!, completionHandler: { (data : Data?, response : URLResponse?, error : Error?) in OperationQueue.main.addOperation({ if (error != nil){ downloadHandler(false, nil, error) } else{ let image = UIImage(data: data!) if image != nil { ImageDownloadManager.sharedManager.imageCache.setObject(image!, forKey: imageURLString as NSString) downloadHandler(true, image, nil) } else { downloadHandler(false, nil, error) } } ImageDownloadManager.sharedManager.imageLoaderQueue[imageURLString] = nil }) }) imageDownloadInfo = ImageDownloadInfo(downloadURLString: imageURLString, downloadTask: imageLoaderTask, progressHandler: nil, completionHandler:nil) imageLoaderQueue[imageURLString] = imageDownloadInfo imageDownloadInfo?.downloadTask.resume() } } private func downloadImageFor(imageURLString:String, progressHandler: @escaping DownloadProgressHandler, completionHandler: @escaping DownloadHandler) { var imageDownloadInfo: ImageDownloadInfo? = imageLoaderQueue[imageURLString] if imageDownloadInfo == nil { let imageLoaderTask = downloadDelegateSession.downloadTask(with: URL(string: imageURLString)!) imageDownloadInfo = ImageDownloadInfo(downloadURLString: imageURLString, downloadTask: imageLoaderTask, progressHandler: progressHandler, completionHandler:completionHandler) imageLoaderQueue[imageURLString] = imageDownloadInfo imageDownloadInfo?.downloadTask.resume() } } } extension ImageDownloadManager : URLSessionDownloadDelegate { func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didFinishDownloadingTo location: URL){ let imageUrl : String = (downloadTask.originalRequest?.url?.absoluteString)! let imageDownloadInfo: ImageDownloadInfo? = imageLoaderQueue[imageUrl] if imageDownloadInfo != nil { do { let data = try Data(contentsOf: location) let image = UIImage(data: data) ImageDownloadManager.sharedManager.imageCache.setObject(image!, forKey: imageUrl as NSString) if let completionHandler = imageDownloadInfo?.completionHandler { completionHandler(true, image, nil) } } catch { print(error.localizedDescription) } } } func urlSession(_ session: URLSession, downloadTask: URLSessionDownloadTask, didWriteData bytesWritten: Int64, totalBytesWritten: Int64, totalBytesExpectedToWrite: Int64){ let imageUrl = downloadTask.originalRequest?.url?.absoluteString let imageDownloadInfo: ImageDownloadInfo? = imageLoaderQueue[imageUrl!] if imageDownloadInfo != nil { if let progressHandler = imageDownloadInfo?.progressHandler { progressHandler(totalBytesExpectedToWrite, totalBytesWritten, nil) } } } }