Question

I am trying to validate uitextfield which

• Doesn’t contain whitespaces,
• Has at least one letter and one number, and
• Its length needs to be greater than 6.

What is the best way to actually test all of these scenarios in one shot?

Answer 1

I would use the NSString method rangeOfCharacterFromSet: to handle your validation:

NSString *str = myTextField.text;

BOOL isValid = ([str length] > 6 &&
                [str rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet]].location != NSNotFound &&
                [str rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]].location != NSNotFound &&
                [str rangeOfCharacterFromSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]].location == NSNotFound);