Swift 3 RKObjectRequestOperation 返回错误无法转换类型为 RKObjectRequestOperation

Posted 2023-02-23

【中文标题】Swift 3 RKObjectRequestOperation 返回错误无法转换类型为 RKObjectRequestOperation

【英文标题】：Swift 3 RKObjectRequestOperation returns error unable to convert of type RKObjectRequestOperation

【发布时间】：2016-11-29 19:44:26

【问题描述】：

我正在尝试将代码从现有应用程序转换为 swift 3 (Xcode 8.1)，但我卡在下面给出错误的代码上：

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

这是我的代码：

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)
        
    

我怀疑这可能与我看到的 FBSDKLoginManager 中的类似错误有关

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

这是产生错误的 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()
            
        )

【问题讨论】：

这可能有助于github.com/ekreative/testbuild-rocks-ios/blob/master/AppsV2/…

【参考方案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)
      )
   

【讨论】：

这不起作用。有 2 个错误，如果我更改为上述错误，第 4 行仍然存在相同的错误。如果我将第 4 行更改为带有问号，则您识别的代码有错误。

【参考方案2】：

解决方案是将错误类型从 NSError 更改为 Error，并使调用和结果参数可选。