Swift 3：Transfer Utility enumerateToAssignBlocks方法签名

官方AWS文档包含以下目标代码

AWSS3TransferUtility *transferUtility = [AWSS3TransferUtility defaultS3TransferUtility]; [transferUtility enumerateToAssignBlocksForUploadTask:^(AWSS3TransferUtilityUploadTask *uploadTask, __autoreleasing AWSS3TransferUtilityUploadProgressBlock *uploadProgressBlockReference, __autoreleasing AWSS3TransferUtilityUploadCompletionHandlerBlock *completionHandlerReference) { NSLog(@"%lu", (unsigned long)uploadTask.taskIdentifier); // Use `uploadTask.taskIdentifier` to determine what blocks to assign. *uploadProgressBlockReference = // Reassign your progress feedback block. *completionHandlerReference = // Reassign your completion handler. } downloadTask:^(AWSS3TransferUtilityDownloadTask *downloadTask, __autoreleasing AWSS3TransferUtilityDownloadProgressBlock *downloadProgressBlockReference, __autoreleasing AWSS3TransferUtilityDownloadCompletionHandlerBlock *completionHandlerReference) { NSLog(@"%lu", (unsigned long)downloadTask.taskIdentifier); // Use `downloadTask.taskIdentifier` to determine what blocks to assign. *downloadProgressBlockReference = // Reassign your progress feedback block. *completionHandlerReference = // Reassign your completion handler. }]; 

我试图将其转换成Swift 3（仅限上传任务）

 transferUtility.enumerateToAssignBlocks(forUploadTask: { let progressPointer = AutoreleasingUnsafeMutablePointer<AWSS3TransferUtilityUploadProgressBlock?>(&uploadProgressBlock) let completionPointer = AutoreleasingUnsafeMutablePointer<AWSS3TransferUtilityUploadCompletionHandlerBlock?>(&completionBlock) progress = progressPointer completion = completionPointer } , downloadTask: nil) 

但Xcode引发以下错误

无法将type（） – >（）的值转换为预期的参数types[…]

任何人都在Swift 3中工作？ 可能的方法签名已经改变

编辑：

我申请了@donkon回答：

  transferUtility.enumerateToAssignBlocks(forUploadTask: { (uploadTask:AWSS3TransferUtilityUploadTask, progress:AutoreleasingUnsafeMutablePointer<(@convention(block) (AWSS3TransferUtilityTask, Progress) -> Void)?>?, error: AutoreleasingUnsafeMutablePointer<(@convention(block) (AWSS3TransferUtilityUploadTask, Error?) -> Void)?>?) in let progressPointer = AutoreleasingUnsafeMutablePointer<AWSS3TransferUtilityProgressBlock?>(&self.progressBlock) let completionPointer = AutoreleasingUnsafeMutablePointer<AWSS3TransferUtilityUploadCompletionHandlerBlock?>(&self.completionHandler) // progress = progressPointer completion = completionPointer }, downloadTask: nil) 

现在Xcode告诉我们，进度和完成都是让值，不能改变的。

Answer 1

您尝试使用的方法有参数是函数。 SDK中的这些函数是用Objective-C编写的。 所以你应该使用@convention(block)来表示它们是Objective-C兼容的块引用。

 AWSS3TransferUtility.default().enumerateToAssignBlocks(forUploadTask: { (uploadTask:AWSS3TransferUtilityUploadTask, uploadProgressBlockReference:AutoreleasingUnsafeMutablePointer<(@convention(block) (AWSS3TransferUtilityTask, Progress) -> Void)?>?, completionHandlerReference: AutoreleasingUnsafeMutablePointer<(@convention(block) (AWSS3TransferUtilityUploadTask, Error?) -> Void)?>?) in print("Hello, world") uploadProgressBlockReference?.pointee = {(task:AWSS3TransferUtilityTask, progress:Progress) -> Void in print("Fraction completed: \(progress.fractionCompleted)") } }, downloadTask: nil)