Password validation in UITextField in iOS

Question

I have 1 UITextfield for password in my iPhone application.

I want to validate this textfield with the following validation.

• Must be at le

Answer 1

You can verify your password validation using the below function just pass a password string and this will return you BOOL value.

-(BOOL) isPasswordValid:(NSString *)pwd {

    NSCharacterSet *upperCaseChars = [NSCharacterSet characterSetWithCharactersInString:@"ABCDEFGHIJKLKMNOPQRSTUVWXYZ"];
    NSCharacterSet *lowerCaseChars = [NSCharacterSet characterSetWithCharactersInString:@"abcdefghijklmnopqrstuvwxyz"];

    //NSCharacterSet *numbers = [NSCharacterSet characterSetWithCharactersInString:@"0123456789"];

    if ( [pwd length]<6 || [pwd length]>20 )
        return NO;  // too long or too short
    NSRange rang;
    rang = [pwd rangeOfCharacterFromSet:[NSCharacterSet letterCharacterSet]];
    if ( !rang.length )
        return NO;  // no letter
    rang = [pwd rangeOfCharacterFromSet:[NSCharacterSet decimalDigitCharacterSet]];
    if ( !rang.length )
        return NO;  // no number;
    rang = [pwd rangeOfCharacterFromSet:upperCaseChars];
     if ( !rang.length )
         return NO;  // no uppercase letter;
    rang = [pwd rangeOfCharacterFromSet:lowerCaseChars];
    if ( !rang.length )
        return NO;  // no lowerCase Chars;
    return YES;
}