从Swift 2.2升级到Swift 3.0后，继续使用`continue`

我有一个swift项目，并且在那里使用Amazon Web Services。

我有一个负责将图像上传到我的S3存储桶的函数，在Swift 2.2中它运行良好，代码如下：

let credentialsProvider = AWSCognitoCredentialsProvider(regionType:CognitoRegionType,
                                                            identityPoolId:CognitoIdentityPoolId)
    let configuration = AWSServiceConfiguration(region:CognitoRegionType, credentialsProvider:credentialsProvider)
    AWSServiceManager.defaultServiceManager().defaultServiceConfiguration = configuration



let uploadRequest = AWSS3TransferManagerUploadRequest()
uploadRequest.body = NSURL(string: "file://"+pathToFile)
uploadRequest.key = NSProcessInfo.processInfo().globallyUniqueString + "." + ext
uploadRequest.bucket = S3BucketName
uploadRequest.contentType = contentType + ext

let transferManager = AWSS3TransferManager.defaultS3TransferManager()
    transferManager.upload(uploadRequest).continueWithBlock { (task) -> AnyObject! in

        if (task.completed) {
        ...

现在，升级到Swift 3之后，我有了：

let credentialsProvider = AWSCognitoCredentialsProvider(regionType:CognitoRegionType,
                                                            identityPoolId:CognitoIdentityPoolId)
    let configuration = AWSServiceConfiguration(region:CognitoRegionType, credentialsProvider:credentialsProvider)
    AWSServiceManager.default().defaultServiceConfiguration = configuration



let uploadRequest = AWSS3TransferManagerUploadRequest()
uploadRequest?.body = URL(string: "file://"+pathToFile)
uploadRequest?.key = ProcessInfo.processInfo.globallyUniqueString + "." + ext
uploadRequest?.bucket = S3BucketName
uploadRequest?.contentType = contentType + ext

let transferManager = AWSS3TransferManager.default()
    transferManager?.upload(uploadRequest).continueWithBlock { (task) -> AnyObject! in

        if (task.isCompleted) {

现在，在最后一条语句中transferManager?.upload(uploadRequest).continueWithBlock抛出一个错误，指出

'continueWithBlock' has been renamed to 'continue(_:)'

因此，我遵循他们的建议并将其更改为：

transferManager?.upload(uploadRequest).continue { 

但这给我抛出了一个错误：

Ambigous use of continue

可用的方法在这里：

但我不确定在这种情况下可以使用哪一个。你能帮我吗？