iOS Forcing number entry in a text field

[gizzerd91]

As my first application, I wanted to make a program that converts Fahrenheit to Celsius, and back again, with one text box for entry, and a toggle of which you're converting from (F or C). The trouble is I know of no way to get a text box to only enter numbers, and my search of the interface editor came up empty on a number entry GUI element. Any help would be wonderfully appreciated.

 

[-aggie-]

You have to write code so that the string for the text box can only accept 0-9 as characters. Fairly easy.

 

[dejo]

Why not just set the keyboard type to only allow the entry of numbers?

 

[gizzerd91]

Good ideas, both of you, but this is my first app, and I have no idea how to do either of those things. Would tell me how to do it, or atleast a place I could learn about how to do it?

 

[-aggie-]

well go here
http://guides.macrumors.com/Cocoa_FAQ

or read:

Kochan's, Programming in Objective-C 2.0
http://www.amazon.com/Programming-O...=sr_1_1?ie=UTF8&s=books&qid=1247890593&sr=8-1

He's a programmer on here and this is a very good beginner's guide.

FYI, this is not something you'll learn in a week or even a month probably. Prepare to spend some time, but it'll be worth it.

Edit: If I assumed you were more of a beginner to this and you're not, please don't thrash me.