Delete files from directory inside Document directory?

In case anyone needs this for the latest Swift / Xcode versions: here is an example to remove all files from the temp folder:

Swift 2.x:

func clearTempFolder() {
    let fileManager = NSFileManager.defaultManager()
    let tempFolderPath = NSTemporaryDirectory()
    do {
        let filePaths = try fileManager.contentsOfDirectoryAtPath(tempFolderPath)
        for filePath in filePaths {
            try fileManager.removeItemAtPath(tempFolderPath + filePath)
        }
    } catch {
        print("Could not clear temp folder: \(error)")
    }
}

Swift 3.x and Swift 4:

func clearTempFolder() {
    let fileManager = FileManager.default
    let tempFolderPath = NSTemporaryDirectory()
    do {
        let filePaths = try fileManager.contentsOfDirectory(atPath: tempFolderPath)
        for filePath in filePaths {
            try fileManager.removeItem(atPath: tempFolderPath + filePath)
        }
    } catch {
        print("Could not clear temp folder: \(error)")
    }
}