Merge pull request MengTo#213 from victors1681/ImageLoader_Swift_3

Fix Image loader swift 3

Author: MengTo

README.md

@@ -1,3 +1,5 @@
+![](https://dl.dropboxusercontent.com/u/7990919/Crawler/SpringSwift3.jpg)
+
 ## Updated for Swift 3.0
 Requires Xcode 8 and Swift 3.
 

Spring/ImageLoader.swift

@@ -37,7 +37,19 @@ public class ImageLoader {
 
     public func imageForUrl(urlString: String, completionHandler: @escaping(_ image: UIImage?, _ url: String) -> ()) {
         DispatchQueue.global(qos: DispatchQoS.QoSClass.background).async { 
-            let data: NSData? = self.cache.object(forKey: urlString as NSString)! as NSData
+            var data: NSData?
+            
+            if let dataCache = self.cache.object(forKey: urlString as NSString){
+                data = (dataCache) as NSData
+                
+            }else{
+                if (URL(string: urlString) != nil)
+                {
+                    data = NSData(contentsOf: URL(string: urlString)!)
+                }else{
+                    return
+                }
+            }
 
             if let goodData = data {
                 let image = UIImage(data: goodData as Data)

Spring/Misc.swift

@@ -232,3 +232,31 @@ public func timeAgoSinceDate(date: Date, numericDates: Bool) -> String {
     }
 
 }
+
+extension UIImageView {
+    func setImage(url: URL, contentMode mode: UIViewContentMode = .scaleAspectFit, placeholderImage: UIImage?) {
+        contentMode = mode
+        URLSession.shared.dataTask(with: url) { (data, response, error) in
+            guard
+                let httpURLResponse = response as? HTTPURLResponse, httpURLResponse.statusCode == 200,
+                let mimeType = response?.mimeType, mimeType.hasPrefix("image"),
+                let data = data, error == nil,
+                let image = UIImage(data: data)
+                else {
+                    self.image = placeholderImage
+                    return
+            }
+            DispatchQueue.main.async() { () -> Void in
+                self.image = image
+                
+            }
+            }.resume()
+    }
+    func setImage(urlString: String, contentMode mode: UIViewContentMode = .scaleAspectFit, placeholderImage: UIImage?) {
+        guard let url = URL(string: urlString) else {
+            image = placeholderImage
+            return
+        }
+        setImage(url: url, contentMode: mode, placeholderImage: placeholderImage)
+    }
+}

Spring/UnwindSegue.swift

@@ -23,5 +23,5 @@
 import UIKit
 
 public extension UIViewController {
-    @IBAction public func unwindToViewController (sender: UIStoryboardSegue){}
-}
+    @IBAction public func unwindToViewController (_ segue: UIStoryboardSegue){}
+}