Snippet to get the last taken photo in iOS

photo.swift

import UIKit
import Photos

// I like to typealias my blocks, makes for easier reading
typealias ImageCallback = (UIImage? -> Void)

func fetchLastPhoto(resizeTo size: CGSize?, imageCallback: ImageCallback) {
    let fetchOptions = PHFetchOptions()
    fetchOptions.sortDescriptors = [NSSortDescriptor(key: "creationDate", ascending: false)]

//        fetchOptions.fetchLimit = 1 // Available in iOS 9

    if let fetchResult = PHAsset.fetchAssetsWithMediaType(.Image, options: fetchOptions) {
        if let asset = fetchResult.firstObject as? PHAsset {
            let manager = PHImageManager.defaultManager()
            let targetSize = size == nil ? CGSize(width: asset.pixelWidth, height: asset.pixelHeight) : size!
            manager.requestImageForAsset(asset,
                targetSize: targetSize,
                contentMode: .AspectFit,
                options: nil,
                resultHandler: { image, info in
                imageCallback(image)
            })
        } else {
            imageCallback(nil)
        }
    }
}