Change tab Basic panel transparency

Question

I am trying to make my tab bar in my tab bar controller to have a low opacity background, so it is translucent, I am trying to do it programmatically, however the background changes to the correct color, but it always seems solid, without transparency.

Here is the code in my TabBarViewController

class TabBarViewController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        self.tabBar.unselectedItemTintColor = UIColor(red: 17.0/255.0, green: 70.0/255.0, blue: 95.0/255.0, alpha: 0.4)
        self.tabBar.barTintColor = UIColor(red: 17.0/255.0, green: 70.0/255.0, blue: 95.0/255.0, alpha: 0.5)


        // Do any additional setup after loading the view.
    }
}

Answer 1

Just replace barTintColorwith backgroundColor.

override func viewDidLoad() {
     super.viewDidLoad()
     self.tabBar.unselectedItemTintColor = UIColor(red: 17.0/255.0, green: 70.0/255.0, blue: 95.0/255.0, alpha: 0.4)
     self.tabBar.backgroundColor = UIColor(red: 17.0/255.0, green: 70.0/255.0, blue: 95.0/255.0, alpha: 0.5)
        // Do any additional setup after loading the view.
}

Answer 2

In that case, you should create a custom UIImagetab backgroundimage.

, - - , UITabBarController:

class TabBarViewController: UITabBarController {

    override func viewDidLoad() {
        super.viewDidLoad()

        let transperentBlackColor = UIColor(displayP3Red: 0, green: 0, blue: 0, alpha: 0.5)

        let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
        UIGraphicsBeginImageContextWithOptions(rect.size, false, 0.0)
        transperentBlackColor.setFill()
        UIRectFill(rect)

        if let image = UIGraphicsGetImageFromCurrentImageContext() {
            tabBar.backgroundImage = image
        }

        UIGraphicsEndImageContext()
    }
}

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