Merge pull request #453 from woxtu/allowed-aspect-ratios

Add allowedAspectRatios property

Author: TimOliver

Swift/CropViewController/CropViewController.swift

@@ -311,6 +311,15 @@ open class CropViewController: UIViewController, TOCropViewControllerDelegate {
         get { return toCropViewController.excludedActivityTypes }
     }
 
+    /**
+     An array of `TOCropViewControllerAspectRatioPreset` enum values denoting which
+     aspect ratios the crop view controller may display (Default is nil. All are shown)
+     */
+    public var allowedAspectRatios: [CropViewControllerAspectRatioPreset]? {
+        set { toCropViewController.allowedAspectRatios = newValue?.map { NSNumber(value: $0.rawValue) } }
+        get { return toCropViewController.allowedAspectRatios?.compactMap { CropViewControllerAspectRatioPreset(rawValue: $0.intValue) } }
+    }
+    
     /**
      When the user hits cancel, or completes a
      UIActivityViewController operation, this block will be called,