Using UITextField for number input

Question

Hi there,
I´m fairly new to the Objective-C scene. Right now I´m trying to put an application for the iPhone together. There should be some user input in a way that the user inputs some numbers and the program uses the different numbers to calculate an output.
As far as I have seen into the iPhone SDK there seems to be only the UITextField for the input, but you only get NSString back.
Is there a different method for number input, something like UINumberField? Or how can I convert the string into something like float or integer?
I would greatly appreciate if you could make some code examples, you know since +I´m new to the Objective-C scene+.
Thank you for your help.
Dietmar, Ulm, Germany

Answer 1

Thank you that worked, somehow. I now have a rather complicated changing from string to double, doing the calculation, to number and back to string for the output:
+NSString *newWeight = textFieldWeight.text;+
+NSString *newSize = textFieldSize.text;+
+double newWeightDouble = newWeight.doubleValue;+
+double newSizeDouble = newSize.doubleValue;+
+double calc = newWeightDouble /= newSizeDouble;+
+NSNumber *calcNum = [[NSNumber alloc] initWithDouble:calc];+
+NSString *calcText = calcNum.stringValue;+
It does work, but I would prefer, let´s say: a rather smoother way.