Faire bouton sur mesure sur la barre D'onglet arrondi

Solution Swift 3

avec un léger ajustement à la solution D'EricB pour avoir ce travail pour Swift 3, le menuButton.la méthode addTarget() doit avoir sa syntaxe de sélection modifiée un peu.

voici le nouveau menuButton.addTarget() fonction:

menuButton.addTarget(self, action: #selector(MyTabBarController.menuButtonAction), for: UIControlEvents.touchUpInside)

en définissant ma classe TabBarController, j'ajoute aussi un UITabBarControllerDelegate et j'ai placé tout cela dans le

override func viewDidAppear(_ animated: Bool) { ... }

Pour plus de la clarté, le code complet est:

Le Code Complet De La Solution

import UIKit

class MyTabBarController: UITabBarController, UITabBarControllerDelegate {

// View Did Load
override func viewDidLoad() {
    super.viewDidLoad()

}

// Tab Bar Specific Code
override func viewDidAppear(_ animated: Bool) {
    let controller1 = UIViewController(self.view.backgroundColor = UIColor.white)
    controller1.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.contacts, tag: 1)
    let nav1 = UINavigationController(rootViewController: controller1)

    let controller2 = UIViewController()
    controller2.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.contacts, tag: 2)
    let nav2 = UINavigationController(rootViewController: controller2)

    let controller3 = UIViewController()
    let nav3 = UINavigationController(rootViewController: controller3)
    nav3.title = ""

    let controller4 = UIViewController()
    controller4.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.contacts, tag: 4)
    let nav4 = UINavigationController(rootViewController: controller4)

    let controller5 = UIViewController()
    controller5.tabBarItem = UITabBarItem(tabBarSystemItem: UITabBarSystemItem.contacts, tag: 5)
    let nav5 = UINavigationController(rootViewController: controller5)

    self.viewControllers = [nav1, nav2, nav3, nav4, nav5]
    self.setupMiddleButton()
}

// TabBarButton – Setup Middle Button
func setupMiddleButton() {
    let menuButton = UIButton(frame: CGRect(x: 0, y: 0, width: 64, height: 64))
    var menuButtonFrame = menuButton.frame
    menuButtonFrame.origin.y = self.view.bounds.height - menuButtonFrame.height
    menuButtonFrame.origin.x = self.view.bounds.width / 2 - menuButtonFrame.size.width / 2
    menuButton.frame = menuButtonFrame

    menuButton.backgroundColor = UIColor.red
    menuButton.layer.cornerRadius = menuButtonFrame.height/2
    self.view.addSubview(menuButton)

    menuButton.setImage(UIImage(named: "example"), for: UIControlState.normal)
    menuButton.addTarget(self, action: #selector(MyTabBarController.menuButtonAction), for: UIControlEvents.touchUpInside)

    self.view.layoutIfNeeded()
}

// Menu Button Touch Action
func menuButtonAction(sender: UIButton) {
    self.selectedIndex = 2
    // console print to verify the button works
    print("Middle Button was just pressed!")
   }
 }

C'est la classe customTabbarcontroller qui est la sous-classe de UITabbarcontroller. C'est la même idée que celle donnée par @EridB. Mais dans son code @Raymond26 le problème n'a pas été résolu. Donc, en affichant une solution complète écrite en Swift 3.0

protocol CustomTabBarControllerDelegate
{
    func customTabBarControllerDelegate_CenterButtonTapped(tabBarController:CustomTabBarController, button:UIButton, buttonState:Bool);
}

class CustomTabBarController: UITabBarController, UITabBarControllerDelegate
{
    var customTabBarControllerDelegate:CustomTabBarControllerDelegate?;
    var centerButton:UIButton!;
    private var centerButtonTappedOnce:Bool = false;

    override func viewDidLayoutSubviews()
    {
        super.viewDidLayoutSubviews();

        self.bringcenterButtonToFront();
    }

    override func viewDidLoad()
    {
        super.viewDidLoad()

        self.delegate = self;

        self.tabBar.barTintColor = UIColor.red;

        let dashboardVC = DashboardViewController()        
        dashboardVC.tabBarItem = UITabBarItem(tabBarSystemItem: .topRated, tag: 1)
        let nav1 = UINavigationController(rootViewController: dashboardVC)

        let myFriendsVC = MyFriendsViewController()
        myFriendsVC.tabBarItem = UITabBarItem(tabBarSystemItem: .featured, tag: 2)
        let nav2 = UINavigationController(rootViewController: myFriendsVC)

        let controller3 = UIViewController()
        let nav3 = UINavigationController(rootViewController: controller3)
        nav3.title = ""

        let locatorsVC = LocatorsViewController()
        locatorsVC.tabBarItem = UITabBarItem(tabBarSystemItem: .downloads, tag: 4)
        let nav4 = UINavigationController(rootViewController: locatorsVC)

        let getDirectionsVC = GetDirectionsViewController()
        getDirectionsVC.tabBarItem = UITabBarItem(tabBarSystemItem: .history, tag: 5)
        let nav5 = UINavigationController(rootViewController: getDirectionsVC)

        viewControllers = [nav1, nav2, nav3, nav4, nav5]

        self.setupMiddleButton()
    }

    // MARK: - TabbarDelegate Methods

    func tabBarController(_ tabBarController: UITabBarController, didSelect viewController: UIViewController)
    {
        switch viewController
        {
        case is DashboardViewController:
            self.showCenterButton()
        case is MyFriendsViewController:
            self.showCenterButton()
        case is GetDirectionsViewController:
            self.showCenterButton()
        case is LocatorsViewController:
            self.showCenterButton()
        default:
            self.showCenterButton()
        }
    }

    // MARK: - Internal Methods

    @objc private func centerButtonAction(sender: UIButton)
    {
        //        selectedIndex = 2
        if(!centerButtonTappedOnce)
        {
            centerButtonTappedOnce=true;
            centerButton.setImage(UIImage(named: "ic_bullseye_white"), for: .normal)
        }
        else
        {
            centerButtonTappedOnce=false;
            centerButton.setImage(UIImage(named: "ic_bullseye_red"), for: .normal)
        }

        customTabBarControllerDelegate?.customTabBarControllerDelegate_CenterButtonTapped(tabBarController: self,
                                                                                          button: centerButton,
                                                                                          buttonState: centerButtonTappedOnce);
    }

    func hideCenterButton()
    {
        centerButton.isHidden = true;
    }

    func showCenterButton()
    {
        centerButton.isHidden = false;
        self.bringcenterButtonToFront();
    }

    // MARK: - Private methods

    private func setupMiddleButton()
    {
        centerButton = UIButton(frame: CGRect(x: 0, y: 0, width: 64, height: 64))

        var centerButtonFrame = centerButton.frame
        centerButtonFrame.origin.y = view.bounds.height - centerButtonFrame.height
        centerButtonFrame.origin.x = view.bounds.width/2 - centerButtonFrame.size.width/2
        centerButton.frame = centerButtonFrame

        centerButton.backgroundColor = UIColor.red
        centerButton.layer.cornerRadius = centerButtonFrame.height/2
        view.addSubview(centerButton)

        centerButton.setImage(UIImage(named: "ic_bullseye_red"), for: .normal)
        centerButton.setImage(UIImage(named: "ic_bullseye_white"), for: .highlighted)
        centerButton.addTarget(self, action: #selector(centerButtonAction(sender:)), for: .touchUpInside)

        view.layoutIfNeeded()
    }

    private func bringcenterButtonToFront()
    {
        print("bringcenterButtonToFront called...")
        self.view.bringSubview(toFront: self.centerButton);
    }

}

C'est le DashboardViewController pour une référence complète:

class DashboardViewController: BaseViewController, CustomTabBarControllerDelegate
{
    override func viewDidLoad()
    {
        super.viewDidLoad()
        (self.tabBarController as! CustomTabBarController).customTabBarControllerDelegate = self;
    }

    override func viewWillAppear(_ animated: Bool)
    {
        super.viewWillAppear(animated);
        (self.tabBarController as! CustomTabBarController).showCenterButton();
    }

    override func viewWillDisappear(_ animated: Bool)
    {
        super.viewWillDisappear(animated);

        self.hidesBottomBarWhenPushed = false;
        (self.tabBarController as! CustomTabBarController).hideCenterButton();
    }

    override func viewWillLayoutSubviews()
    {
        super.viewWillLayoutSubviews();

        if(!isUISetUpDone)
        {
            self.view.backgroundColor = UIColor.lightGray
            self.title = "DASHBOARD"
            self.prepareAndAddViews();
            self.isUISetUpDone = true;
        }
    }

    override func didReceiveMemoryWarning()
    {
        super.didReceiveMemoryWarning()
    }

    //MARK: CustomTabBarControllerDelegate Methods

    func customTabBarControllerDelegate_CenterButtonTapped(tabBarController: CustomTabBarController, button: UIButton, buttonState: Bool)
    {
        print("isDrive ON : \(buttonState)");
    }

    //MARK: Internal Methods

    func menuButtonTapped()
    {
        let myFriendsVC = MyFriendsViewController()
        myFriendsVC.hidesBottomBarWhenPushed = true;
        self.navigationController!.pushViewController(myFriendsVC, animated: true);
    }

    //MARK: Private Methods

    private func prepareAndAddViews()
    {
        let menuButton = UIButton(frame: CGRect(x: 100, y: 100, width: 100, height: 50))
        menuButton.titleLabel?.text = "Push"
        menuButton.titleLabel?.textColor = UIColor.white
        menuButton.backgroundColor = UIColor.red;
        menuButton.addTarget(self, action: #selector(DashboardViewController.menuButtonTapped), for: .touchUpInside)
        self.view.addSubview(menuButton);
    }
}

avec StoryBoard: Cliquez sur le bouton tab bar dans le contrôleur de vue de l'élément tab bar particulier que vous voulez faire proéminent,

supprimer le texte, il suffit de régler l'image insérée en haut à -25 du bouton de la barre d'onglets. Vérifier comme ci-dessous l'image