将UINavigationBar更改为透明颜色

Question

I want my UINavigationBar to be completely transparent except for the title and the buttons I add to it.

I just can't seem to make it work. I've tried everything already. This made the most sense to me:

override func viewDidLoad() {
    self.title = "CURRENT BALANCE"

    self.navigationController!.navigationBar.setBackgroundImage(UIImage(), for: .default)
    self.navigationController!.navigationBar.shadowImage = UIImage()
    self.navigationController!.navigationBar.isTranslucent = true

    self.setupSideMenu()

    self.topUpButton.asCircle()
    self.exchangeButton.asCircle()
    self.lockButton.asCircle()
}

Answer 1

this is my OC code to make UINavigationBar to be completely transparent:

first set the VC to UINavigationControllerDelegate , then override - (void) navigationController:(UINavigationController *)navigationController willShowViewController:(UIViewController *)viewController animated:(BOOL)animated

    // change the backgroudcolor black
    self.navigationController.navigationBar.tintColor = [UIColor colorWithRed:0.000 green:0.000 blue:0.000 alpha:1.000];
    // change the alpha 0.3
    self.navigationController.navigationBar.alpha = 0.300;
    // change the translucent YES
    self.navigationController.navigationBar.translucent = YES; 

mainwhile, check your code about the self.view.backgroudcolor , if any view under your UINavigationBar have a backgroudcolor, your UINavigationBar will display the view's color.

Answer 2

Set background color property of navigation bar

self.navigationController!.navigationBar.backgroundColor = UIColor.clear

Update:

self.navigationController!.navigationBar.setBackgroundImage(UIImage(), for: UIBarMetricsDefault)

Answer 3

This is transparent NavigationController code for swift 4:

override func viewDidLoad() {
    super.viewDidLoad()
    self.navigationBar.setBackgroundImage(UIImage(), for: .default)
    self.navigationBar.shadowImage = UIImage()
    self.navigationBar.isTranslucent = true
}