Revert "remove iOS support"

This reverts commit ff16c13.

CMakeLists.txt

@@ -663,14 +663,13 @@ if(OCOS_ENABLE_VISION)
     if(WIN32)
       # Use WIC on Windows. Nothing to be done
       set(_DEFAULT_CODEC_ENABLE OFF)
-    elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin") # OR CMAKE_SYSTEM_NAME STREQUAL "iOS")
-      set(_DEFAULT_CODEC_ENABLE OFF)
-      # for iOS, it reports Undefined symbols for architecture x86_64: "_kUTTypeJPEG", which requires more work to fix.
+    elseif(CMAKE_SYSTEM_NAME STREQUAL "Darwin" OR CMAKE_SYSTEM_NAME STREQUAL "iOS")
       # Use ImageIO on Apple platforms
+      set(_DEFAULT_CODEC_ENABLE OFF)
       set(_APPLE_FRAMEWORKS "-framework CoreFoundation" "-framework CoreGraphics" "-framework ImageIO" "-framework CoreServices")
-      # if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
-      #   list(APPEND _APPLE_FRAMEWORKS "-framework MobileCoreServices")
-      # endif()
+      if(CMAKE_SYSTEM_NAME STREQUAL "iOS")
+        list(APPEND _APPLE_FRAMEWORKS "-framework MobileCoreServices")
+      endif()
       target_link_libraries(ocos_operators PRIVATE ${_APPLE_FRAMEWORKS})
     endif()
   endif()

test/test_tools_add_pre_post_processing_to_model.py

@@ -449,7 +449,7 @@ def test_draw_box_crop_pad(self):
             create_boxdrawing_model.create_model(output_model, is_crop=is_crop)
             image_ref = np.frombuffer(load_image_file(output_img), dtype=np.uint8)
             output = self.draw_boxes_on_image(output_model, test_boxes[idx])
-            self.assertLess(compare_two_images_mse(image_ref, output), 0.2)
+            self.assertLess(compare_two_images_mse(image_ref, output), 0.13)
 
     def test_draw_box_share_border(self):
         import sys
@@ -1018,7 +1018,7 @@ def test_FastestDet(self):
         # output.tofile(str(output_img) + "actual.png")
 
         image_ref = np.frombuffer(load_image_file(output_img), dtype=np.uint8)
-        self.assertLess(compare_two_images_mse(image_ref, output), 0.2)
+        self.assertLess(compare_two_images_mse(image_ref, output), 0.1)
 
 
 if __name__ == "__main__":