fix: fix image zoom center issue (#390)

use image center as zoom center
guoyingtao · Apr 10, 2024 · c0f892c · c0f892c
1 parent e08e341
commit c0f892c
Showing 1 changed file with 13 additions and 0 deletions.
diff --git a/Sources/Mantis/CropView/CropView+UIScrollViewDelegate.swift b/Sources/Mantis/CropView/CropView+UIScrollViewDelegate.swift
@@ -24,6 +24,19 @@ extension CropView: UIScrollViewDelegate {
         viewModel.setTouchImageStatus()
     }
 
+    func scrollViewDidZoom(_ scrollView: UIScrollView) {
+        guard scrollView.subviews.count > 0 else {
+            return
+        }
+
+        let subView = scrollView.subviews[0]
+
+        let offsetX: CGFloat = max((scrollView.bounds.size.width - scrollView.contentSize.width) * 0.5, 0.0)
+        let offsetY: CGFloat = max((scrollView.bounds.size.height - scrollView.contentSize.height) * 0.5, 0.0)
+
+        subView.center = CGPointMake(scrollView.contentSize.width * 0.5 + offsetX, scrollView.contentSize.height * 0.5 + offsetY)
+    }
+
     func scrollViewDidEndDecelerating(_ scrollView: UIScrollView) {
         viewModel.setBetweenOperationStatus()
     }