下载后移动文件

Question

Im using parse to download some files to the device and all is good but i want to then move the file from the default cache directory which is where parse stores them (/Library/Caches/PFFileCache/) to somewhere more stable say the users documents directory.

The localised error i am getting is:

Error: “7b54d8a0f1a64b710058d4408ca4d696_The%20Name%20of%20the%20Wind%2029-92.mp3” couldn’t be moved to “Documents” because either the former doesn't exist, or the folder containing the latter doesn't exist.

But I'm sure both exist. It may be something to do with the name as when i ge the name from the PFFile it doesn't have the encoded %20 in the file name.

This is my code block:

    let cachedPFFile = object.object(forKey: "partAudio") as! PFFile
        print(cachedPFFile)
    let getCachedFilePath = cachedPFFile.getPathInBackground()
        getCachedFilePath.waitUntilFinished()
    let cachedFilePath = getCachedFilePath.result as! String
        print(cachedFilePath)

    let paths = FileManager.default.urls(for: .documentDirectory, in: .userDomainMask)
    let documentsDirectory = String(describing: paths[0])

    let saveDirectory = documentsDirectory.appending(cachedPFFile.name)

        print(documentsDirectory)
        print(saveDirectory)

    let fileManager = FileManager.default

    if fileManager.fileExists(atPath: saveDirectory) == false {

        do {
            try fileManager.moveItem(atPath: cachedFilePath, toPath: saveDirectory)
            print("Move successful")
        } catch let error {
            print("Error: \(error.localizedDescription)")
        }

    }

This is the entire log:

<PFFile: 0x608000458f00>
2017-02-20 18:42:35.430 ParseStarterProject-Swift[2260:55934] Warning: A long-running operation is being executed on the main thread. 
 Break on warnBlockingOperationOnMainThread() to debug.
/Users/Genie/Library/Developer/CoreSimulator/Devices/A2FB00CE-B018-4FDF-9635-35FD6678DF8D/data/Containers/Data/Application/BA7C112C-BECB-4734-8C67-A9CB84F0E1F3/Library/Caches/Parse/PFFileCache/7b54d8a0f1a64b710058d4408ca4d696_The%20Name%20of%20the%20Wind%2029-92.mp3
file:///Users/Genie/Library/Developer/CoreSimulator/Devices/A2FB00CE-B018-4FDF-9635-35FD6678DF8D/data/Containers/Data/Application/BA7C112C-BECB-4734-8C67-A9CB84F0E1F3/Documents/
file:///Users/Genie/Library/Developer/CoreSimulator/Devices/A2FB00CE-B018-4FDF-9635-35FD6678DF8D/data/Containers/Data/Application/BA7C112C-BECB-4734-8C67-A9CB84F0E1F3/Documents/7b54d8a0f1a64b710058d4408ca4d696_The Name of the Wind 29-92.mp3
Error: “7b54d8a0f1a64b710058d4408ca4d696_The%20Name%20of%20the%20Wind%2029-92.mp3” couldn’t be moved to “Documents” because either the former doesn't exist, or the folder containing the latter doesn't exist.

I am confused by this because both the file and the new directory exist??

though I'm not sure about the "file:///Users" as this doesn't work in finder, have to use the true path "/Users" how can i remove "file://" from the start of the string??

Also I've been searching SO without luck on how to add the %20 in the spaces of the file name none of the obvious options seem to work.

Answer 1

You have threading issues. Your entire idea of "waitUntilFinished" is wrong. You cannot block the main thread — and you are getting a warning telling you so. Listen to that warning!

Do not call getFilePathInBackground , and do not wait for the download to finish. Instead, call getFileInBackgroundWithBlock: , and inside the block proceed with the rest of your code, ie move the file.