Iphone/Android App possible?

Hi, I see there are apps where you can use arduino that exist but would it also be possible to develop my own app that I can upload arduino code into a trinket or pro trinket that I have embedded in one of my portable projects? Also, would I be able to do it wirelessly or would I need to connect my phone to my project through the micro usb?

Thanks

I believe there are projects out there that upload new sketches via Bluetooth..

Most (all?) phones have Bluetooth now a days..

I would search on that approach first.

I'm not sure what code you plan on writing on your phone though? The Arduino IDE isnt great.. but I'd say its better than typing things out on your phone.

My plan is to find someone to build me a new app specific to my project. So not using any app that exists today. I want to have this custom app developed but have the ability to use this app to upload arduino code into my project.

Was just wondering if this would even be possible to do??