Check NSURL for UTI / file type

Question

I'm building an app that allows users to drop videos onto it. Given a list of dropped NSURL*s how do I make sure each one conforms to the public.movie UTI type?

If I had an NSOpenPanel, I would just use openPanel.allowedFileTypes = @[@"public.movie"]; and Cocoa would take care of it for me.

Thanks in advance!

score 21 · Accepted Answer · answered Sep 19 '12 at 22:34

21

This should work:

NSWorkspace *workspace = [NSWorkspace sharedWorkspace];

for (NSURL *url in urls) {
    NSString *type;
    NSError *error;
    if ([url getResourceValue:&type forKey:NSURLTypeIdentifierKey error:&error]) {
        if ([workspace type:type conformsToType:@"public.movie"]) {
            // the URL points to a movie; do stuff here
        }
    } else {
        // handle error
    }
}

(You can also use UTTypeConformsTo() instead of the NSWorkspace method.)

answered Sep 19 '12 at 22:34

Wevah

28,182
7
83
72

How do you do this on iOS? ```NSWorkspace``` requires ```AppKit``` which is only available on ```macOS```. Thanks. – Supertecnoboff Feb 12 '18 at 15:57
Found the answer to my own question - for iOS: https://stackoverflow.com/a/5815629/1598906 – Supertecnoboff Feb 12 '18 at 16:25

score 1 · Answer 2 · answered Aug 10 '16 at 22:11

1

Swift version:

do {
    var value: AnyObject?
    try url.getResourceValue(&value, forKey:NSURLTypeIdentifierKey)
    if let type = value as? String {
        if UTTypeConformsTo(type, kUTTypeMovie) {
        ...
        }
    }
}
catch {
}

answered Aug 10 '16 at 22:11

david72

7,151
3
37
59

score 0 · Answer 3 · answered Mar 08 '20 at 22:18

Swift 5 version:

if let resourceValues = try? localUrl.resourceValues(forKeys: [URLResourceKey.typeIdentifierKey]) {
    if let typeId = resourceValues.typeIdentifier {
        if UTTypeConformsTo(type, kUTTypeMovie) {
            ...
        }
    }
}

Check NSURL for UTI / file type

3 Answers3