development: converted PhotoLibrary requestAccess call to dispatch delegation…

development: converted PhotoLibrary requestAccess call to dispatch delegation methods and callback on the main thread async

Sources/iOS/PhotoLibrary.swift

@@ -62,7 +62,7 @@ public protocol PhotoLibraryDelegate {
     /**
      A delegation method that is executed when the PhotoLibrary status is updated.
      - Parameter photoLibrary: A reference to the PhotoLibrary.
-     - Parameter status: A reference to the AuthorizationStatus.
+     - Parameter status: A reference to the PHAuthorizationStatus.
      */
     @objc
     optional func photoLibrary(photoLibrary: PhotoLibrary, status: PHAuthorizationStatus)
@@ -214,8 +214,9 @@ extension PhotoLibrary {
      - Parameter _ completion: A completion block that passes in a PHAuthorizationStatus
      enum that describes the response for the authorization request.
      */
-    public func requestAuthorization(_ completion: ((PHAuthorizationStatus) -> Void)? = nil) {
+    public func requestAuthorization(_ completion: (@escaping (PHAuthorizationStatus) -> Void)? = nil) {
         PHPhotoLibrary.requestAuthorization { [weak self, completion = completion] (status) in
+            DispatchQueue.main.async { [weak self, completion = completion] in
                 guard let s = self else {
                     return
                 }
@@ -243,6 +244,7 @@ extension PhotoLibrary {
                 }
             }
         }
+    }
 }
 
 /// Fetch.

Sources/iOS/PhotoLibraryController.swift

@@ -28,7 +28,7 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-import Photos
+import UIKit
 
 open class PhotoLibraryController: UIViewController, PhotoLibraryDelegate {
     /// A reference to a PhotoLibrary.