iOS Development - Navigation, Tab, Scroll

Intro to Navigation Controller

// Create instance of navigation controller

self.navController = [[UINavigationController alloc] init];

    

// Create instance of First View Controller

FirstViewController *firstVC = [[FirstViewController alloc]init];

    

// Push firstVC onto navigation stack

// animated set to NO so that you don't see the page sliding on first load

[self.navController pushViewController:firstVC animated:NO];

    

// Push entire stack onto window (canvas)

[self.window setRootViewController:self.navController];

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Going to another page from a button in firstVC

- (IBAction)buttonPressed:(id)sender {

    

    // Push in 2nd view controller

    SecondViewController *secondVC = [[SecondViewController alloc]init];

    [self.navigationController pushViewController:secondVC animated:YES];

    

}

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Intro to Tab Bar Controller

// Initialisation

    self.tabBarController = [[UITabBarController alloc] init];

    RedViewController *redVC = [[RedViewController alloc]init];

    BlueViewController *blueVC = [[BlueViewController alloc]init];

    NSArray *vcArray = [NSArray arrayWithObjects:redVC, blueVC, nil];

    [self.tabBarController setViewControllers:vcArray];

    [self.window setRootViewController:self.tabBarController];

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Putting a Nav View Controller in a Tab Bar Controller

AppDelegate.m

    self.tabBarController = [[UITabBarController alloc] init];

    self.whiteNavController = [[UINavigationController alloc] init];

    

    RedViewController *redVC = [[RedViewController alloc]init];

    redVC.tabBarItem.title = @"Red";

    redVC.tabBarItem.image = [UIImage imageNamed:@"all.png"];

    

    BlueViewController *blueVC = [[BlueViewController alloc]init];

    blueVC.tabBarItem.title = @"Blue";

    blueVC.tabBarItem.image = [UIImage imageNamed:@"search.png"];

    

    WhiteViewController *whiteVC = [[WhiteViewController alloc]init];

    whiteVC.tabBarItem.title = @"White";

    whiteVC.tabBarItem.image = [UIImage imageNamed:@"faves.png"];

    [self.whiteNavController pushViewController:whiteVC animated:NO];

    

    NSArray *vcArray = [NSArray arrayWithObjects:redVC, blueVC, self.whiteNavController, nil];

    [self.tabBarController setViewControllers:vcArray];

    [self.window setRootViewController:self.tabBarController];

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Scroll View

    // Create UIImageView to store image

    UIImageView *myImageView = [[UIImageView alloc]initWithImage:[UIImage imageNamed:@"nature-wallpaper-hd1.jpg"]];

    

    // Set up scroll view content size to the size of the image

    self.myScrollView.contentSize = myImageView.frame.size;

    

    // Add the image view onto scrollview

    [self.myScrollView addSubview:myImageView];