feat: Add rotation to Image in iOS (#540)

packages/google_mlkit_commons/ios/Classes/MLKVisionImage+FlutterPlugin.m

@@ -6,9 +6,17 @@ @implementation MLKVisionImage(FlutterPlugin)
 + (MLKVisionImage *)visionImageFromData:(NSDictionary *)imageData {
     NSString *imageType = imageData[@"type"];
     if ([@"file" isEqualToString:imageType]) {
-        return [self filePathToVisionImage:imageData[@"path"]];
+        int rotation = [imageData[@"metadata"][@"rotation"] intValue];
+        UIImageOrientation imageOrientation = [self imageOrientationFromRotation:rotation];
+        MLKVisionImage *image = [self filePathToVisionImage:imageData[@"path"]];
+        image.orientation = imageOrientation;
+        return image;
     } else if ([@"bytes" isEqualToString:imageType]) {
-        return [self bytesToVisionImage:imageData];
+        int rotation = [imageData[@"metadata"][@"rotation"] intValue];
+        UIImageOrientation imageOrientation = [self imageOrientationFromRotation:rotation];
+        MLKVisionImage *image = [self bytesToVisionImage:imageData];
+        image.orientation = imageOrientation;
+        return image;
     } else {
         NSString *errorReason = [NSString stringWithFormat:@"No image type for: %@", imageType];
         @throw [NSException exceptionWithName:NSInvalidArgumentException
@@ -17,6 +25,19 @@ + (MLKVisionImage *)visionImageFromData:(NSDictionary *)imageData {
     }
 }
 
++ (UIImageOrientation)imageOrientationFromRotation:(int)rotation {
+    switch (rotation) {
+        case 90:
+            return UIImageOrientationRight;  // Rotates the image 90 degrees to the right
+        case 180:
+            return UIImageOrientationDown;  // Rotates the image 180 degrees
+        case 270:
+            return UIImageOrientationLeft;  // Rotates the image 90 degrees to the left
+        default:
+            return UIImageOrientationUp;  // Default orientation (no rotation)
+    }
+}
+
 + (MLKVisionImage *)filePathToVisionImage:(NSString *)filePath {
     UIImage *image = [UIImage imageWithContentsOfFile:filePath];
     MLKVisionImage *visionImage = [[MLKVisionImage alloc] initWithImage:image];