How to split filename from file extension in Swift?

Solution Swift 4

This solution will work for all instances and does not depend on manually parsing the string.

let path = "/Some/Random/Path/To/This.Strange.File.txt"

let fileName = URL(fileURLWithPath: path).deletingPathExtension().lastPathComponent

Swift.print(fileName)

The resulting output will be

This.Strange.File

Swift 5.0 update:

As pointed out in the comment, you can use this.

let filename: NSString = "bottom_bar.png"
let pathExtention = filename.pathExtension
let pathPrefix = filename.deletingPathExtension

Works in Swift 5. Adding these behaviors to String class:

extension String {

    func fileName() -> String {
        return URL(fileURLWithPath: self).deletingPathExtension().lastPathComponent 
    }

    func fileExtension() -> String {
        return URL(fileURLWithPath: self).pathExtension
    }
}

Example:

let file = "image.png"
let fileNameWithoutExtension = file.fileName()
let fileExtension = file.fileExtension()

This is with Swift 2, Xcode 7: If you have the filename with the extension already on it, then you can pass the full filename in as the first parameter and a blank string as the second parameter:

let soundURL = NSBundle.mainBundle()
    .URLForResource("soundfile.ext", withExtension: "")

Alternatively nil as the extension parameter also works.

If you have a URL, and you want to get the name of the file itself for some reason, then you can do this:

soundURL.URLByDeletingPathExtension?.lastPathComponent

Swift 4

let soundURL = NSBundle.mainBundle().URLForResource("soundfile.ext", withExtension: "")
soundURL.deletingPathExtension().lastPathComponent