ios - Path extension and MIME type of file in swift

Question

I'm learning swift , and I made a table with cells that show an image ,and classes in groups by MIME TYPE (using path extension). I had a question about extensions. If the images (for example, it could be a video or a pdf) are taken from internet , i'm not sure if they have the extension or not how can I get the MIMEtype of a file inside my file System without using path extension ? PS :Sorry for my bad english it's not my native language

Answer 1

If anyone wants to get the MimeType from the actual URL of the file this code worked for me:

import MobileCoreServices

func mimeTypeForPath(path: String) -> String {
    let url = NSURL(fileURLWithPath: path)
    let pathExtension = url.pathExtension

    if let uti = UTTypeCreatePreferredIdentifierForTag(kUTTagClassFilenameExtension, pathExtension! as NSString, nil)?.takeRetainedValue() {
        if let mimetype = UTTypeCopyPreferredTagWithClass(uti, kUTTagClassMIMEType)?.takeRetainedValue() {
            return mimetype as String
        }
    }
    return "application/octet-stream"
}