JSON图像解析IOS Swift 3.0
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【中文标题】JSON图像解析IOS Swift 3.0【英文标题】：JSON Image Parsing IOS Swift 3.0 【发布时间】：2016-12-08 09:55:07 【问题描述】：我是 ios 快速开发的新手。我正在尝试使用动态数据/url 进行 json 图像解析，我尝试在没有结果的情况下搜索在表格视图或列表视图中显示数据和图像的示例，有人可以帮助我完成这项任务吗？
下面是图片解析的链接
http://www.androidbegin.com/tutorial/jsonparsetutorial.txt
【问题讨论】：
您是否要在 cellforrow 中加载图像并在 tableview 单元格中设置？... 你能分享你的代码吗？你想解析数据？问题不是 100% 可以理解的 是的，使用 json 提要并在表格视图中显示 @Dheeraj D bro 我基本上是 android 人学习 IOS 试图在 ios 中进行 json 图像解析，需要一个很好的例子来学习 json imge 解析 尝试关注***.com/questions/16663618/… 【参考方案1】：作为一个新手，我认为这个库可以减轻你的大部分工作，
SwiftyJSON语法对开发人员非常友好和简单，没有if let 语法和嵌套的困扰。示例用法通过简单的一行创建 json
let json = JSON(data : data) 以及更多自定义数据类型。看看这个库
let rank = json["worldpopulation"][0]["rank"].int
let country = json["worldpopulation"][0]["country"].string
let flag = json["worldpopulation"][0]["flag"].string
【讨论】：
【参考方案2】： 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
【讨论】：
【参考方案3】：斯威夫特 3.0 创建新的 Xcode 项目 采取一张表视图 创建 tableViewCell 文件 创建 NSObject 类文件 拿一张标签（国名） 取一个 imageView(flag) 把下面的代码放在正确的地方（注意：在开始代码之前提到地方）
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 单元格代码
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)
先复制这两个文件（注意下面2 File Name Not Change Strikly Follow）
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)
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<NSString, UIImage> = 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)
【讨论】：
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