Write an iPhone application

I am the Owner of [login to view URL], which is a platform to control expenses and emit taxation reports for my local country (Ecuador). I have already developed the Android App (which you can find in the PlayStore as SIZUMA), but my knowledge of iOS is pretty null. That is why the target of this project is to create the Apple App, based on the already developed Android App. All the needs of what the APP should do are the same ones that the Android App already do. We have: 1) Show graphs (no more than 2-3 graphs) with data from our main web platform. 2) Consult invoices (with filters) from our main web platform. 3) Register invoices data + take picture of the physical invoice and input that data into our main platform database. 4) Consult and edit profile information (very basic) 5) Log In and Creat Account (recover password also). No social media integration. 6) Invite people to use our service (like dropbox), already developed in our main platform. Most of the programming is already done with WEB SERVICES that the Android App uses. Not sure is same structure would work for the iOS App. We will cover the fee to develop de App due to the need that we have to register the App under OUR NAME AND ACCOUNT.