Manipulating textfield values in an iPhone app

Question

How do I manipulate textfield variables within an iPhone app? I want to have three text fields, formatted to numbers only, and be able to manipulate the data when I press different buttons.

Any help would be appreciated!

Answer 1

UITextField objects have a "text" property of type NSString that can be read and written. Keep a reference to the text fields, and when a button is pressed, update the field's text property with a new NSString to change its contents. If the text fields are not directly editable by the user, you may want to use UILabel instead, which is basically just a non-editable text field (and which also has a read/write "text" property).

Answer 2

You may also want to read about the NSNumberFormatter class that allows you to format the input into whatever way is relevant to your application (currency values, floats, etc).

Answer 3

To solve the problem of editing certain text fields, you could disable the user interaction until a button is pressed.