[image_picker] fix bug, sometimes double click cancel button will crash

Author: iheron

packages/image_picker/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.6.4+1
+
+* Fix a bug, sometimes double click cancel button will crash.
+
 ## 0.6.4
 
 * Add a new parameter to select preferred camera device.

packages/image_picker/ios/Classes/FLTImagePickerPlugin.m

@@ -323,8 +323,10 @@ - (void)imagePickerController:(UIImagePickerController *)picker
 
 - (void)imagePickerControllerDidCancel:(UIImagePickerController *)picker {
   [_imagePickerController dismissViewControllerAnimated:YES completion:nil];
+  if (!self.result) {
+    return;
+  }
   self.result(nil);
-
   self.result = nil;
   _arguments = nil;
 }

packages/image_picker/pubspec.yaml

@@ -2,7 +2,7 @@ name: image_picker
 description: Flutter plugin for selecting images from the Android and iOS image
   library, and taking new pictures with the camera.
 homepage: https://github.com/flutter/plugins/tree/master/packages/image_picker
-version: 0.6.4
+version: 0.6.4+1
 
 flutter:
   plugin: