How do I convert the value of a UITextField to an NSNumber?

Question

Hi!

I have a small problem with iphone sdk. I have 4 values into my xib, 4 UITextField where I insert hostname, description, name and PORT. Port is numeric number (NSNUMBER). I must convert text (UITextField) into an NSNUMBER object but I don't know how. I try to do: NSNumber *temp = [[NSNumber alloc] initWithString:portTextField.text]; serverObj.port = temp;

but App crash. I haven't problems with NSString (description ecc.)

Thank you!

Answer 1

There is no method for NSNumber objects called initWithString: (that's why your app crashes). You need to use NSNumberFormatter's method numberFromString:

Answer 2

Just use the 'integerValue' method of NSString, to get a 'NSInteger'. Then you can create a NSNumber object from it.

serverObj.port = [ NSNumber numberWithInteger: [ portTextField.text integerValue ] ];

Answer 3

NSNumberFormatter * f = [[NSNumberFormatter alloc] init];
[f setNumberStyle:NSNumberFormatterDecimalStyle];
NSNumber * myNumber = [f numberFromString:textField.text];
[f release];

And that should get the job done.