关于objective C：检查 NSURL 的 UTI / 文件类型 | 珊瑚贝

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
    }
}

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

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