[image_picker] Fix pickMultiImage throwing an error on iOS 13 and below.

packages/image_picker/image_picker_ios/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.8.4+12
+
+* Fixes `pickMultiImage` throwing an exception on iOS 13 and below.
+
 ## 0.8.4+11
 
 * Splits from `image_picker` as a federated implementation.

packages/image_picker/image_picker_ios/example/ios/RunnerTests/ImagePickerPluginTests.m

@@ -178,6 +178,7 @@ - (void)testPickMultiImageShouldUseUIImagePickerControllerOnPreiOS14 {
 
   OCMVerify(times(1),
             [mockUIImagePicker setSourceType:UIImagePickerControllerSourceTypePhotoLibrary]);
+  XCTAssertEqual([plugin getMaxImagesAllowed], 0);
 }
 
 #pragma mark - Test camera devices, no op on simulators

packages/image_picker/image_picker_ios/ios/Classes/FLTImagePickerPlugin.m

@@ -73,6 +73,10 @@ + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
   [registrar addMethodCallDelegate:instance channel:channel];
 }
 
+- (int)getMaxImagesAllowed {
+  return self.maxImagesAllowed;
+}
+
 - (UIImagePickerController *)createImagePickerController {
   if ([self.imagePickerControllerOverrides count] > 0) {
     UIImagePickerController *controller = [self.imagePickerControllerOverrides firstObject];
@@ -136,13 +140,16 @@ - (void)pickImageWithPHPicker:(int)maxImagesAllowed API_AVAILABLE(ios(14)) {
   [self checkPhotoAuthorizationForAccessLevel];
 }
 
-- (void)launchUIImagePickerWithSource:(int)imageSource {
+- (void)launchUIImagePickerWithSource:(int)imageSource multiImage:(BOOL)multiImage {
   UIImagePickerController *imagePickerController = [self createImagePickerController];
   imagePickerController.modalPresentationStyle = UIModalPresentationCurrentContext;
   imagePickerController.delegate = self;
   imagePickerController.mediaTypes = @[ (NSString *)kUTTypeImage ];
 
-  self.maxImagesAllowed = 1;
+  // Picking multiple images is unsupported on iOS 13 and below,
+  // but this still has to be set as it determines the correct
+  // return type (list or single item).
+  self.maxImagesAllowed = multiImage ? 0 : 1;
 
   switch (imageSource) {
     case SOURCE_CAMERA:
@@ -179,16 +186,16 @@ - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result
         [self pickImageWithPHPicker:1];
       } else {
         // UIImagePicker is used
-        [self launchUIImagePickerWithSource:imageSource];
+        [self launchUIImagePickerWithSource:imageSource multiImage:false];
       }
     } else {
-      [self launchUIImagePickerWithSource:imageSource];
+      [self launchUIImagePickerWithSource:imageSource multiImage:false];
     }
   } else if ([@"pickMultiImage" isEqualToString:call.method]) {
     if (@available(iOS 14, *)) {
       [self pickImageWithPHPicker:0];
     } else {
-      [self launchUIImagePickerWithSource:SOURCE_GALLERY];
+      [self launchUIImagePickerWithSource:SOURCE_GALLERY multiImage:true];
     }
   } else if ([@"pickVideo" isEqualToString:call.method]) {
     UIImagePickerController *imagePickerController = [self createImagePickerController];

packages/image_picker/image_picker_ios/ios/Classes/FLTImagePickerPlugin_Test.h

@@ -27,6 +27,9 @@
  */
 - (void)handleSavedPathList:(NSArray *)pathList;
 
+/** The property to keep track of how many images are allowed to be picked */
+- (int)getMaxImagesAllowed;
+
 /**
  * Tells the delegate that the user cancelled the pick operation.
  *

packages/image_picker/image_picker_ios/pubspec.yaml

@@ -2,7 +2,7 @@ name: image_picker_ios
 description: iOS implementation of the video_picker plugin.
 repository: https://github.com/flutter/plugins/tree/main/packages/image_picker/image_picker_ios
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+image_picker%22
-version: 0.8.4+11
+version: 0.8.4+12
 
 environment:
   sdk: ">=2.14.0 <3.0.0"