- (BOOL)textField:(UITextField *)textField shouldChangeCharactersInRange:(NSRange)range replacementString:(NSString *)string {
NSString *text = [textField.text stringByReplacingCharactersInRange:range withString:string];
NSString *regexStr = @"^\\d{0,3}$";
NSPredicate *predicate = [NSPredicate predicateWithFormat:@"self matches %@", regexStr];
if([predicate evaluateWithObject:text] && [text integerValue] <= 100){
return YES;
}
return NO;
}