Fixed cropping issue when picture is zoomed

Author: Tulleb

ALCameraViewController/ViewController/ConfirmViewController.swift

@@ -318,14 +318,17 @@ public class ConfirmViewController: UIViewController, UIScrollViewDelegate {
 		                      y: cropOverlay.frame.origin.y + cropOverlay.outterGap,
 		                      width: cropOverlay.frame.size.width - 2 * cropOverlay.outterGap,
 		                      height: cropOverlay.frame.size.height - 2 * cropOverlay.outterGap)
-		cropRect.origin.x += scrollView.contentOffset.x
-		cropRect.origin.y += scrollView.contentOffset.y
-		
-		let normalizedX = cropRect.origin.x / imageView.frame.width
-		let normalizedY = cropRect.origin.y / imageView.frame.height
-		
-		let normalizedWidth = cropRect.width / imageView.frame.width
-		let normalizedHeight = cropRect.height / imageView.frame.height
+        cropRect.origin.x += scrollView.contentOffset.x - imageView.frame.origin.x
+        cropRect.origin.y += scrollView.contentOffset.y - imageView.frame.origin.y
+
+		let normalizedX = max(0, cropRect.origin.x / imageView.frame.width)
+		let normalizedY = max(0, cropRect.origin.y / imageView.frame.height)
+
+        let extraWidth = min(0, cropRect.origin.x)
+        let extraHeight = min(0, cropRect.origin.y)
+
+		let normalizedWidth = min(1, (cropRect.width + extraWidth) / imageView.frame.width)
+		let normalizedHeight = min(1, (cropRect.height + extraHeight) / imageView.frame.height)
 
 		return CGRect(x: normalizedX, y: normalizedY, width: normalizedWidth, height: normalizedHeight)
 	}