             source = sourceStr.substringWithRange(NSMakeRange(startRange, length))
         }
     }
-    var pic_urls : [[String : AnyObject]]?
+    var pic_urls : [[String : AnyObject]]?{
+        didSet{
+            picURLS = [NSURL]()
+            for dict in pic_urls!{
+                if let urlStr = dict["thumbnail_pic"]
+                {
+                    // 将字符串转换为URL保存到数组中
+                    picURLS?.append(NSURL(string: urlStr as! String)!)
+                }
+            }
+        }
+    }
+    var picURLS : [NSURL]?
     var user : User?
     
     

                //1 json to model , 然后装在集合
            print("json= \(Json)")
            let models = dict2model(Json!["statuses"] as! [[String: AnyObject]])
            finished(list: models, error: nil)
            }) { (_, error) -> Void in
                finished(list: nil, error: error)
        }
    }
    
    // description

//

import UIKit
import SDWebImage

class Statuses: NSObject {

