An Unity iOS Swift plugin to pick images from album

DDDImageConverter.swift

//
//  DDDImageConverter.swift
//  Unity-iPhone
//
//  Created by dddnuts on 5/1/16.
//
//

import UIKit
import Photos

class DDDImageConverter: NSObject {
    class func getImageURL(asset: PHAsset, size: CGSize) -> NSURL {
        let manager = PHImageManager.defaultManager()
        let options = PHImageRequestOptions()
        options.synchronous = true
        
        var publicURL = NSURL()
        
        manager.requestImageForAsset(asset, targetSize: size, contentMode: .AspectFit, options: options, resultHandler: { result, info in
            guard let image = result
                else { return }
            
            guard let imageData = UIImagePNGRepresentation(image)
                else { return }
            
            let dateFormatter = NSDateFormatter()
            dateFormatter.dateFormat = "yyyyMMdd_HHmmss"
            let dateString = dateFormatter.stringFromDate(NSDate())
            
            let imageName = "dddimage_\(dateString).png"
            let imagePath = (NSTemporaryDirectory() as NSString).stringByAppendingPathComponent(imageName)
            
            let success = imageData.writeToFile(imagePath, atomically: true)
            if !success {
                return
            }
            
            publicURL = NSURL(fileURLWithPath: imagePath)
        })
        
        return publicURL
    }
}

DDDImagePicker.swift

//
//  DDDImagePicker.swift
//  Unity-iPhone
//
//  Created by dddnuts on 5/6/16.
//
//

import UIKit
import QBImagePicker

public class DDDImagePicker: NSObject {
    public class func open() {
        let picker = QBImagePickerController()
        picker.delegate = DDDImagePickerDelegate.sharedInstance
        
        picker.allowsMultipleSelection = true;
        picker.minimumNumberOfSelection = 1;
        picker.maximumNumberOfSelection = 1;
        
        picker.assetCollectionSubtypes = [
            PHAssetCollectionSubtype.SmartAlbumUserLibrary.rawValue,
            PHAssetCollectionSubtype.AlbumMyPhotoStream.rawValue
        ];
        
        let unityViewController = Unifty.GetGLViewController()
        unityViewController.presentViewController(picker, animated: true, completion: nil)
    }
}

DDDImagePickerDelegate.swift

//
//  DDDImagePickerDelegate.swift
//  Unity-iPhone
//
//  Created by dddnuts on 5/6/16.
//
//

import UIKit
import QBImagePicker

class DDDImagePickerDelegate: NSObject, QBImagePickerControllerDelegate {
    let DDDImagePickerDelegateObject = "ImagePicker"
    let DDDImagePickerDelegateMethodComplete = "DidCompletePicking"
    let DDDImagePickerDelegateMethodCancel = "DidCancelPicking"
    
    static let sharedInstance = DDDImagePickerDelegate()
    
    func qb_imagePickerControllerDidCancel(imagePickerController: QBImagePickerController) {
        Unifty.SendMessage(DDDImagePickerDelegateObject,
                           method: DDDImagePickerDelegateMethodCancel,
                           msg: "")
        
        let unityViewController = Unifty.GetGLViewController()
        unityViewController.dismissViewControllerAnimated(true, completion: nil)
    }
    
    func qb_imagePickerController(imagePickerController: QBImagePickerController, didFinishPickingAssets assets: [AnyObject]) {
        let image = assets.first as! PHAsset
        let url = DDDImageConverter.getImageURL(image, size:CGSize(width: 320, height: 320))
        
        Unifty.SendMessage(DDDImagePickerDelegateObject,
                           method: DDDImagePickerDelegateMethodComplete,
                           msg: url.absoluteString)
        
        let unityViewController = Unifty.GetGLViewController()
        unityViewController.dismissViewControllerAnimated(true, completion: nil)
    }
}

DDDImagePickerPlugin.mm

//
//  DDDImagePickerPlugin.mm
//  Unity-iPhone
//
//  Created by dddnuts on 4/29/16.
//
//

#import <QBImagePicker/QBImagePicker.h>
#import <ProductName-Swift.h>

extern "C" {
    void DDDImagePicker_Open() {
        [DDDImagePicker open];
    }
}

ProductName-Swift.h

SWIFT_CLASS("_TtC9ProductName14DDDImagePicker")
@interface DDDImagePicker : NSObject
+ (void)open;
- (nonnull instancetype)init OBJC_DESIGNATED_INITIALIZER;
@end