An amazing iOS application with Firebase, Socket.IO, STOMP, Cordova, Ionic, PhoneGap, Flutter whatever development framework requirement, because I am very familiar and proficient with them. I would make your app a very awesome experience for customer with very swift animations, gesture recognizers you might be interested in. I am willing and able to it in Swift and/or Objective C. app could also be able to detect phone motion, support fingerprint locks and authentication, detect current locations and other very essential but undermined features that most apps require, but that would be for you decide. Just try me and see how I could perform. I understand it's a little hard to gain freelance trust online, but If you give me, trust me I won't betray it. I am also very familiar with many other iOS Core frameworks such as Core Motion, CoreLocation, CoreML, CoreText, Core Data, Core Foundation, and many others.
What the Seller needs to start the work
A detailed specification and description of the app to be developed, including UI Wireframes, or Mockups, and the iPhone versions or screen sizes you are targeting.