Text Detection From Firebase MLKit:
You can find demo code for Image to Text conversion using Firebase MLKit in iOS.
https://github.com/sayaleepote/TextDetect
For live recognization, you can create a custom camera and take a picture in the background periodically and detect a text from an image.
Custom Camera View for Capture Images:
For custom camera view, you can use below sample code.
Link: https://github.com/AlexLittlejohn/ALCameraViewController
Note: You can achieve this feature using iOS native MLKit + Vision framework
Refer This link for iOS native framework.
https://stackoverflow.com/questions/50918310
Let me know if you have any query.
Thanks.