从Swit2.3到Swift3的转换会导致“以类型为NSException的未捕获异常终止". [英] Conversion from Swit2.3 to Swift3 cause "Terminating with uncaught exception of type NSException"

问题描述

这是我想从Swift2.3转换为Swift3的代码:

AWSCloudLogic.defaultCloudLogic().invokeFunction(functionName,
                                                         withParameters: parameters, completionBlock: {(result: AnyObject?, error: NSError?) -> Void in
                                                            if let result = result {
                                                                dispatch_async(dispatch_get_main_queue(), {
                                                                    print("CloudLogicViewController: Result: \(result)")
                                                                    //self.activityIndicator.stopAnimating()
                                                                    //self.resultTextView.text = prettyPrintJson(result)
                                                                })
                                                            }
                                                            var errorMessage: String
                                                            if let error = error {
                                                                if let cloudUserInfo = error.userInfo as? [String: AnyObject],
                                                                    cloudMessage = cloudUserInfo["errorMessage"] as? String {
                                                                    errorMessage = "Error: \(cloudMessage)"
                                                                    print(errorMessage)
                                                                } else {
                                                                    errorMessage = "Error occurred in invoking the Lambda Function. No error message found."
                                                                    print(errorMessage)
                                                                }
                                                                dispatch_async(dispatch_get_main_queue(), {
                                                                    print("Error occurred in invoking Lambda Function: \(error)")
                                                                    //self.activityIndicator.stopAnimating()
                                                                    //self.resultTextView.text = errorMessage
                                                                    let alertView = UIAlertController(title: NSLocalizedString("Error", comment: "Title bar for error alert."), message: error.localizedDescription, preferredStyle: .Alert)
                                                                    alertView.addAction(UIAlertAction(title: NSLocalizedString("Dismiss", comment: "Button on alert dialog."), style: .Default, handler: nil))
                                                                    self.presentViewController(alertView, animated: true, completion: nil)
                                                                })
                                                            }
        })

Swift2.3的定义:

Definition of Swift2.3:

/**
     Invokes the specified AWS Lambda function and passes the results and possible error back to the application asynchronously.

     @param name AWS Lambda function name, e.g., hello-world
     @param parameters The object from which to generate JSON request data. Can be `nil`.
     @param completionBlock handler for results from the function
     */
    public func invokeFunction(name: String, withParameters parameters: AnyObject?, completionBlock: (AnyObject, NSError) -> Void)

这是Swift3版本:

    AWSCloudLogic.defaultCloudLogic().invokeFunction(functionName, withParameters: parameters) { (result : Any?, error: Error?) in


        if let result = result{
            print(result)

        }
        if let error = error{
            print(error)
            print("error")

        }else{

            print("No error but issue")
        }

    }

Swift3的定义:

Definition of Swift3:

/**
 Invokes the specified AWS Lambda function and passes the results and possible error back to the application asynchronously.

 @param name AWS Lambda function name, e.g., hello-world
 @param parameters The object from which to generate JSON request data. Can be `nil`.
 @param completionBlock handler for results from the function
 */
open func invokeFunction(_ name: String, withParameters parameters: Any?, completionBlock: @escaping (Any, Error) -> Swift.Void)

更多详细信息:

当我在Swift 2.3上运行此代码时，它可以正常工作，但是当我在Swift 3中运行该代码时，它到达此行

When I run this code on Swift 2.3 it works fine but when I run it in Swift 3 when it get to this line

AWSCloudLogic.defaultCloudLogic().invokeFunction(functionName, withParameters: parameters) { (result : Any?, error: Error?) in

它得到当前错误:

libc++abi.dylib: terminating with uncaught exception of type NSException

没有其他描述！

推荐答案

Swift 3支持刚刚发布，请重新下载MobileHub示例应用程序.检查它是使用v0.10模板生成的，该模板显示在顶部任何文件的注释中. https://console.aws.amazon.com/mobilehub/home

Swift 3 support has just been released, please download the MobileHub sample app again. Checking that it was generated with v0.10 template shown in any file's comments at the top. https://console.aws.amazon.com/mobilehub/home

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