Creating custom directory in iOS Swift 2.2

Question

I am trying to create a custom directory using following snippet, that I essentially translated from a working Obj-C code for the same app.

class func pathToConfigFolder() -> String {
    let urls: [String] = NSSearchPathForDirectoriesInDomains(.LibraryDirectory, .UserDomainMask, true)
    let libraryPath: String = urls.last!
    let configFolder: String = NSURL(fileURLWithPath: libraryPath).URLByAppendingPathComponent(".conf").absoluteString

    var directory: ObjCBool = ObjCBool(true)
    if !NSFileManager.defaultManager().fileExistsAtPath(configFolder, isDirectory: &directory) {
        do {
            try NSFileManager.defaultManager().createDirectoryAtPath(configFolder, withIntermediateDirectories: false, attributes: nil)
        } catch let error {
            print(" Error thrown... \(error)")
        }
    }
    return configFolder
}

But the code fails with following error.

Error thrown... Error Domain=NSCocoaErrorDomain Code=4 "The operation couldn’t be completed. (Cocoa error 4.)" UserInfo=0x17526f4c0 {NSFilePath=file:///var/mobile/Containers/Data/Application/44D90AEB-DD7A-4C8C-9AD0-2665147BAAEC/Library/conf, NSUnderlyingError=0x174054c40 "The operation couldn’t be completed. No such file or directory"}

I have tried both on device and simulator running iOS 9.

EDIT Objective-C Code

+ (NSString*) pathToConfigFolder
{
    NSArray *urls = NSSearchPathForDirectoriesInDomains(NSLibraryDirectory,
                                                        NSUserDomainMask, YES);
    NSString *libraryPath = [urls lastObject];

    NSString *configFolder = [libraryPath stringByAppendingPathComponent:@".conf"];

    NSError *error = nil;

    if ( ! [[NSFileManager defaultManager] fileExistsAtPath:configFolder]) {

        [[NSFileManager defaultManager] createDirectoryAtPath:configFolder
                                  withIntermediateDirectories:NO
                                                   attributes:nil
                                                        error:&error];
    }
    return configFolder;
}

Attach the Obj-C code, maybe we can spot the differences.

facumedica
– facumedica

2016-07-20 21:54:55 +00:00
Commented Jul 20, 2016 at 21:54 — facumedica
– facumedica, Commented Jul 20, 2016 at 21:54

Tom Harrington · Accepted Answer · 2016-07-20 22:30:49Z

1

Your problem is here:

let libraryPath: String = urls.last!
let configFolder: String = NSURL(fileURLWithPath: libraryPath).URLByAppendingPathComponent(".conf").absoluteString

The absoluteString method returns the entire URL as a string, so your configFolder is file:///var/mobile/Containers/Data/Application/44D90AEB-DD7A-4C8C-9AD0-2665147BAAEC/Library/conf. That is, it includes the file:// and is therefore not a valid file path suitable for use with the NSFileManager methods you use it with.

Changing those lines to look like this would fix the problem:

let libraryPath: NSString = urls.last!
let configFolder = libraryPath.stringByAppendingPathComponent(".conf")

I'm using NSString here because that's where stringByAppendingPathComponent is defined.

answered Jul 20, 2016 at 22:30

Tom Harrington

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4 Comments

Tom Harrington Over a year ago

When I used String the compiler complained that stringByAppendingPathComponent didn't exist.

Tom Harrington Over a year ago

The code I posted does not use URLs, it uses file paths. I left the misnamed urls variable alone because changing it didn't seem relevant.

Tom Harrington Over a year ago

@LeoDabus please do feel free to write your own answer to this question.

atastrophic Over a year ago

thank you so much, it did the trick. Had to cast String to NSString to use that method. :)

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