Extending UITextField to reuse some behaviours

UITextFieldNumber.m

#import "UITextFieldNumber.h"

@implementation UITextFieldNumber

- (void)awakeFromNib
{
    [self createKeyboardToolbar];
}

- (void)createKeyboardToolbar
{
    UIToolbar *toolbarView = [[UIToolbar alloc] initWithFrame:CGRectMake(0, 0, self.frame.size.width, 35)];
    toolbarView.tintColor = [UIColor blackColor];
    toolbarView.translucent = YES;
    UIBarButtonItem *doneButton = [[UIBarButtonItem alloc] initWithTitle:@"Fechar" style:UIBarButtonItemStyleDone target:self action:@selector(closeKeyboard)];
    [toolbarView setItems:[NSArray arrayWithObject:doneButton]];
    self.inputAccessoryView = toolbarView;
}

- (void)closeKeyboard
{
    [self resignFirstResponder];
}

- (void)textFieldDidEndEditing:(UITextField *)textField
{
    NSLog(@"Digitou mesmo");
}

- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string
{
    NSLog(@"Digitando");
    
    return YES;
}

@end