How can I capture text input dialogue in a tex input popup box on iPhone? i.e. name and email

In my app, when the user taps a button a number will decrease until it hits zero. When the number hits zero I want to display an input popup box for the user to put their name and email. I then want to be able to capture this information, as the developer, so that I can then be able to contact the user of my app. Thanks for the help!