how to implement a button to switch in another view - ios

Question

i'm new to developing with xcode,and i'm following the apple's tutorial:"Second's ios app tutorial". I've add a button to my scene "Add Sighting View Controller",and i want to switch this view to another(BirdsViewController)that have a list of bird's names. in my storyboard i've create a segue between the button and BirdsViewController and also connect the button to touch up inside, but when i run the app the button doesn't appear.Can anybody help me?thank you.
here's my code(i don't have implemented any other methods):
AddSightingViewController.h
#class BirdSighting;
#interface AddSightingViewController : UITableViewController
#property (weak, nonatomic) IBOutlet UITextField *birdNameInput;
#property (weak, nonatomic) IBOutlet UITextField *locationInput;
#property (strong, nonatomic) BirdSighting *birdSighting;
#property (strong, nonatomic) UIButton *showBirds;
-(IBAction)displayBirds:(id)sender;
AddSightingViewController.m
#import "AddSightingViewController.h"
#import "BirdSighting.h"
#import "BirdsViewController.h"
#import <UIKit/UIKit.h>
#class BirdSighting;
#interface AddSightingViewController ()
#end
#implementation AddSightingViewController
#synthesize showBirds;
-(BOOL)textFieldShouldReturn:(UITextField *)textField {
if((textField == self.birdNameInput) || (textField == self.locationInput)) {
[textField resignFirstResponder];
}
return YES;
}
-(void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender {
if([[segue identifier] isEqualToString:#"ReurnInput"]) {
if ([self.birdNameInput.text length] || [self.locationInput.text length])
{
BirdSighting *sighting;
NSDate *today = [NSDate date];
sighting = [[BirdSighting alloc] initWithName:self.birdNameInput.text
location:self.locationInput.text date:today];
self.birdSighting = sighting;
}
}
}
BirdsViewController *viewController;
-(IBAction)showBirds:(id)sender {
viewController =
[[BirdsViewController alloc]
initWithNibName:#"BirdsViewController" bundle:nil];
[[self navigationController] pushViewController:viewController animated:YES];
}

Answer 1

I dont see any allocation and adding of button as subview to the viewcontroller's view.
I think in the app like other textfields, button is also IBOutlet. Declare button as an IBOutlet and connect the outlet to the button in the interface builder file.
#property (weak, nonatomic) IBOutlet UIButton *showBirds;
Or allocate the button and add as subview to viewcontroller's view.