How can I limit the number of decimal points in a UITextField?

Question

I have a UITextField that when clicked brings up a number pad with a decimal point in the bottom left. I am trying to limit the field so that a user can only place 1 decimal

Answer 1

In whatever object you set your UITextField's delegate to, add a method that answers to "[- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string]".

Then you can either use a NSNumberFormatter object or you can brute force check for an already existing decimal place mark (returning NO if a decimal mark already exists).