如何在iOS上创建标签栏？

Question

I need on my main view controller to have a tab bar with tabs to navigate to all my other controllers. I just need the tab bar on this controller and when i get to another controller i just need to have a back button to go to the main controller. Now i have some questions. I created the tab bar in the main view controller and all the tabs with the text and images that i need. However i see that i can only create IBOutlet for the tab bar and not IBActions for every tab(as i thought). So i created an IBOutlet and connected it to my tab bar.

How can i refer to every tab?

If i can refer to every tab how is it possible to change the view controller when a tab is selected when i cant use an action about it?(I am not asking for the code to change controllers , i am asking for the place that i should put the code so that my application knows that this specific tab was pressed and has to change controller). Thank you for reading my post :D

Answer 1

You can create a UITabBarController programmatically in applicationDidFinishLaunching and set it as the root view controller (or if you prefer, you can present it as a modal view). Here is the minimal code to do it:

UITabBarController *tabBarController = [[UITabBar alloc] init];

UIViewController *controller1 = [[YourViewController alloc] init];
UIViewController *controller2 = [[YourOtherViewController alloc] init];

tabBarController.viewControllers = [NSArray arrayWithObjects:
    controller1,
    controller2,
    nil];

// set as the root window
window.rootViewController = tabBarController;

If you want to customize the look of the tab bar items, do so by adding overloading (UITabBarItem *)tabBarItem in the child view controller(s):

- (UITabBarItem *)tabBarItem
{
    return [[UITabBarItem alloc] initWithTitle:@"Amazing" image:[UIImage imageNamed:@"Blah.png"] tag:0];
}

Answer 2

How to make a tab bar controller by me

1. Drag tab bar controller into storyboard (hopefully you have one)
2. Control-drag from tab bar controller to each view you want hooked up to it
3. Pop bottles

Just so you know, this gives you the default tab bar controller behavior (so it will always be present and you can click from any page to another). If that's not what you want, then don't use a tab bar controller. To do otherwise is an abomination.

Answer 3

Storyboards are definitely helpful, but if you don't want to use one that's fine. Doing the Control Drag from the Tab Bar Controller to your new View Controller does indeed work (Dustin's response).