From 2d80702f097c331baf22c18a04eaad8b84d3334e Mon Sep 17 00:00:00 2001
From: Wenqi Li <firelands128@gmail.com>
Date: Mon, 24 Jul 2023 00:40:57 +0800
Subject: [PATCH] optimize iOS code

---
 ios/Classes/SwiftPhotoGalleryPlugin.swift | 13 ++++++++-----
 1 file changed, 8 insertions(+), 5 deletions(-)

diff --git a/ios/Classes/SwiftPhotoGalleryPlugin.swift b/ios/Classes/SwiftPhotoGalleryPlugin.swift
index ff61397..2129c0b 100644
--- a/ios/Classes/SwiftPhotoGalleryPlugin.swift
+++ b/ios/Classes/SwiftPhotoGalleryPlugin.swift
@@ -617,12 +617,15 @@ public class SwiftPhotoGalleryPlugin: NSObject, FlutterPlugin {
   }
   
   private func extractSizeFromAsset(asset: PHAsset) -> Int64? {
-    let resources = PHAssetResource.assetResources(for: asset)
-    guard let resource = resources.first,
-          let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong else {
-      return nil
+    if #available(iOS 9.0, *) {
+      let resources = PHAssetResource.assetResources(for: asset)
+      if let resource = resources.first{
+        if let unsignedInt64 = resource.value(forKey: "fileSize") as? CLong {
+          return Int64(unsignedInt64)
+        }
+      }
     }
-    return Int64(bitPattern: UInt64(unsignedInt64))
+    return nil;
   }
   
   private func extractTitleFromFilename(filename: String?) -> String? {