Get sharable file URL from PHAsset

DDDImageConverter.swift

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

import UIKit
import Photos

public class DDDImageConverter: NSObject {
    public 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
    }
}