UIAlertViewHelper.m

- (void)displayError:(NSError *)error
{
    [self displayAlertWithTitle:@"Error" message:[error description]];
}
    
- (void)displayAlertWithTitle:(NSString *)title message:(NSString *)message
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
                                                        message:message
                                                       delegate:nil
                                              cancelButtonTitle:@"OK"
                                              otherButtonTitles:nil];
    [alertView show];
}
    
- (void)displayPromptWithTitle:(NSString *)title message:(NSString *)message placeholder:(NSString *)placeholder
{
    UIAlertView *alertView = [[UIAlertView alloc] initWithTitle:title
                                                        message:message
                                                       delegate:self
                                              cancelButtonTitle:@"Cancel"
                                              otherButtonTitles:@"OK", nil];
    alertView.alertViewStyle = UIAlertViewStylePlainTextInput;
    
    [alertView textFieldAtIndex:0].text = placeholder;
    
    [alertView show];
}