斯威夫特3 RKObjectRequestOperation返回错误无法类型RKObjectRequestOperation的转换

Question

我试图代码从现有的应用程序转换为SWIFT 3（Xcode中8.1），但我被困在下面的代码给错误：

cannot convert value of type (RKObjectRequestOperation!, RKMappingResult!) -> Void to expected argument type (RKObjectRequestOperation?, RKMappingResult?) -> Void!) 

这里是我的代码：

class func getShoppingItemsForPage(_ page: Int,pageSize: Int, 
             completionHandler:@escaping ([ShopItemModel]?,NSError?) ->()) { 

     RKObjectManager.sharedManager().getObjectsAtPath("search", 
        parameters: ["page" : page, "pagesize" : pageSize], success: { (request: RKObjectRequestOperation!, result: RKMappingResult!) -> Void in 

       let resultArray = result.array() as? [ShopItemModel] 
       completionHandler(resultArray,nil) 

      }) { (request: RKObjectRequestOperation!, error: NSError!) -> Void in 

       completionHandler(nil,error) 
     } 
    } 

我怀疑这可能与从FBSDKLoginManager类似的错误在那里我看到

Cannot convert value of type (FBSDKLoginManagerLoginResult!, NSError!) -> Void to expected argument type "FBSDKLoginManagerRequestTokenHandler!" 

以下是产生错误的Facebook代码。

loginManager.logIn(withReadPermissions: facebookReadPermissions, from: self, handler: {(result:FBSDKLoginManagerLoginResult!,error:NSError!) -> Void in 
      if error != nil { 
       // Process Error 
      } 
      else if result.isCancelled { 
       // Cancelled by User 
      } 
      else { 
       let delegate:AppDelegate = UIApplication.shared.delegate as! AppDelegate 
       delegate.showMainStoryboard() 
      } 
     }) 

Answer 1

class func getShoppingItemsForPage(_ page: Int,pageSize: Int, 
             completionHandler:@escaping ([ShopItemModel]?,NSError?) ->()) { 

     RKObjectManager.sharedManager().getObjectsAtPath("search", 
                 parameters: ["page" : page, "pagesize" : pageSize], 
                 success: {(operation: RKObjectRequestOperation!, mappingResult: RKMappingResult!) -> Void in 
                 let resultArray = mappingResult.array() as? [ShopItemModel] 
                 completionHandler(resultArray,nil) 
     }, failure: {(operation: RKObjectRequestOperation!, error: NSError!) -> Void in 
     completionHandler(nil,error) 
     }) 
    } 

Answer 2

解决的办法是从NSError更改错误类型错误，并拨打电话，并导致PARAMS可选。