Set the maximum character length of a UITextField in iOS

#define MAX_LENGTH 20

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    if (textField.text.length >= MAX_LENGTH && range.length == 0)
    {
     return NO; // return NO to not change text
    }
    else
    {return YES;}
}

Numeric Keyboard Hide Method in iOS

Numeric Keyboard in IOS

//Just call NavBarNumberPad this method from viewDidLoad.

#pragma mark - Numeric Keyboard Hide Method

-(void)NavBarNumberPad

{

    

    UIToolbar* numberToolbar = [[UIToolbar alloc]initWithFrame:CGRectMake(0, 0, 320,50)];

    numberToolbar.barStyle = UIBarStyleBlackTranslucent;

    numberToolbar.items = [NSArray arrayWithObjects:

                           [[UIBarButtonItem alloc]initWithTitle:@"Cancel"style:UIBarButtonItemStyleBordered target:self action:@selector(cancelNumberPad)],

                           [[UIBarButtonItemalloc]initWithBarButtonSystemItem:UIBarButtonSystemItemFlexibleSpace target:nilaction:nil],

                           [[UIBarButtonItem alloc]initWithTitle:@"OK"style:UIBarButtonItemStyleDone target:self action:@selector(doneWithNumberPad)],

                           nil];

    [numberToolbar sizeToFit];

    textField.inputAccessoryView = numberToolbar;

}

-(void)cancelNumberPad{

    [textField resignFirstResponder];

}

-(void)doneWithNumberPad{

    [textField resignFirstResponder];

}