My app is for private use and is to work like this.
There are 80 buttons. Each button push corresponds to a rolling Google Speadsheet.
A time stamp along with the button name is recorded in a row. Further button presses will record onto a new row.
you can use [login to view URL] to manage the exchange of button presses to the google spreadsheet.
in the diagram background (which will be provided) you can see an example of the button layout.
see video for example - [login to view URL]
Hey! Your apps very simple. I might be able to build it in about a day or less. I have done iOS development previously as well and looking forward to do it for you now. I hope to get a positive reply.