dropbox api - How to Use SwiftyDropbox's "destination" with a Download -

in reviewing swiftydropbox tutorial in v2 dropbox api, shows how perform download:

// download file let destination : (nsurl, nshttpurlresponse) -> nsurl = { temporaryurl, response in     let filemanager = nsfilemanager.defaultmanager()     let directoryurl = filemanager.urlsfordirectory(.documentdirectory, indomains: .userdomainmask)[0]     // generate unique name file in case we've seen before     let uuid = nsuuid().uuidstring     let pathcomponent = "\(uuid)-\(response.suggestedfilename!)"     return directoryurl.urlbyappendingpathcomponent(pathcomponent) }  client.files.download(path: "/myfile.db", destination: destination).response { response, error in     if let (metadata, url) = response {         print("*** download file ***")         let data = nsdata(contentsofurl: url)         print("downloaded file name: \(metadata.name)")         print("downloaded file url: \(url)")         print("downloaded file data: \(data)")     } else {         print(error!)     } } 

i'm unclear what's going on destination part. why need generate random string filename?

when try specify own filename, download doesn't seem work:

let destination : (nsurl, nshttpurlresponse) -> nsurl = { temporaryurl, response in   let directoryurl = nsfilemanager.defaultmanager().urlsfordirectory(.documentdirectory, indomains: .userdomainmask)[0]   return directoryurl.urlbyappendingpathcomponent("myfile.db") } 

i want download file dropbox named myfile.db , want put in device's documents directory name myfile.db , overwrite if it's there.

how can that?

when doesn't seem work, expect mean error this:

error domain=nscocoaerrordomain code=516 "“cfnetworkdownload_bpyhu1.tmp” couldn’t moved “documents” because item same name exists." userinfo={nssourcefilepatherrorkey=..., nsuserstringvariant=( move ), nsdestinationfilepath=..., nsunderlyingerror=0x7fda0a67cea0 {error domain=nsposixerrordomain code=17 "file exists"}}

swiftydropbox, virtue of using alamofire, doesn't let overwrite files using download function.

specifically, swiftydropbox calls download in alamofire, , alamofire calls nsfilemanager.moveitematurl. documentation nsfilemanager.moveitematurl says:

if item same name exists @ dsturl, method aborts move attempt , returns appropriate error.

so, seems it's being cautious, , making hard app accidentally overwrite (ad potentially lose) data. if know want overwrite particular file, you'll need explicitly, after dropbox api call. we'll consider feature request though.

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update: swiftydropbox offers ability overwrite files directly of version 3.1.0, e.g., using download(path:rev:overwrite:destination:).