It is not possible by using iOS API.
I am a professional software iOS developer for more than six years. During last two years my focus is on Swift apps which form the majority of my projects.
During that time I did work with my clients from all around the world: USA, Australia, Deutschland, Italy, France, United Arab Emirates, Greek, China and many others. They rated me with the best scores in over 75 projects and more than a thousand billed hours combined.
On Upwork, I have 800+ billed hours in 16 projects rated at 5 stars. Actually, I am also recognised as a Top rated freelancer.
On Freelancer, I have done 49 projects, also rated 5 stars and recognized as a Preferred freelancer.