ImageProvider

ImageProvider.swift

//
//  ImageProvider.swift
//  Tuity-iOS
//
//  Created by Sanket Firodiya on 7/13/16.
//  Copyright © 2016 Tuity. All rights reserved.
//

import UIKit

class ImageProvider: NSObject {
  
  static var sharedInstance = ImageProvider()
  private var imageCache = [String: UIImage]()
  
  func fetchImageWithUrl(url: String!, completionBlock: (image: UIImage) -> ()) {
    if let image = self.imageCache[url] {
      completionBlock(image: image)
    } else {
      let imageURL = kBaseUrl + "/" + url
      let request = NSMutableURLRequest(URL: NSURL(string: imageURL)!)
      var httpHeaderParams: [String: String] = [:]
      httpHeaderParams = NetworkRequest.appendAppIdApiKeyHTTPHeaders(httpHeaderParams)
      request.allHTTPHeaderFields = httpHeaderParams
      let downloadTask = NSURLSession.sharedSession().dataTaskWithRequest(request) { (data, response, error) in
        if error == nil {
          if let image = UIImage(data: data!) {
            dispatch_async(dispatch_get_main_queue(), {
              if self.imageCache.indexForKey(url) == nil {
                self.imageCache[url] = image
              }
              completionBlock(image: image)
            })
          }
        }
      }
      downloadTask.resume()
    }
  }
}