UTType.swift

import Foundation
import MobileCoreServices

struct UTType: CustomStringConvertible {
    let value: CFString
    init?(mimeType: String) {
        guard let UTI = UTTypeCreatePreferredIdentifierForTag(kUTTagClassMIMEType, mimeType as CFString, nil)?.takeUnretainedValue() else { return nil }
        value = UTI
    }
    
    var description: String {
        return value as String
    }
}

extension UTType {
    var isImage: Bool {
        return UTTypeConformsTo(value, kUTTypeImage)
    }
    
    var isSVG: Bool {
        return UTTypeConformsTo(value, kUTTypeScalableVectorGraphics)
    }
}

let image = UTType(mimeType: "image/jpg")
image?.isImage // true
image?.isSVG   // false

let svg = UTType(mimeType: "image/svg+xml")
svg?.isImage // true
svg?.isSVG   // true