reading value in CFDictionary with swift

Question

I\'m just starting with swift and cocoa. I\'m trying to create a basic app that does image manipulation.

I\'ve allready got all information of the image with this:

Answer 1

I've found it much easier to access the properties by 'converting' the CFDictionary to a Swift dictionary.

let imageSource = CGImageSourceCreateWithURL(imageURL, nil)
let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as Dictionary
let dpiWidth = imageProperties[kCGImagePropertyDPIWidth] as NSNumber

---

Quick update for Swift 2.0 (excuse all the if lets - I just quickly crafted this code):

import UIKit
import ImageIO

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()

        if let imagePath = NSBundle.mainBundle().pathForResource("test", ofType: "jpg") {
            let imageURL = NSURL(fileURLWithPath: imagePath)
            if let imageSource = CGImageSourceCreateWithURL(imageURL, nil) {
                if let imageProperties = CGImageSourceCopyPropertiesAtIndex(imageSource, 0, nil) as Dictionary? {
                    let pixelWidth = imageProperties[kCGImagePropertyPixelWidth] as! Int
                    print("the image width is: \(pixelWidth)")
                }
            }
        }
    }
}