问题

Am newbie to ios and I found this solution on making the UINavigationBar Transparent. Where in my project files can I put this code

[self.navigationBar setBackgroundImage:[UIImage new]
                     forBarMetrics:UIBarMetricsDefault];
self.navigationBar.shadowImage = [UIImage new];
self.navigationBar.translucent = YES;

So that it is applied in my entire project where navigation controller is being used.

回答1:

Put in your viewDidLoad function of your rootViewController this code:

Objective-C:

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                     forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
self.navigationController.navigationBar.translucent = YES;
self.navigationController.view.backgroundColor = [UIColor clearColor];

Swift 2.x:

if let navigationBar = navigationController?.navigationBar {
        navigationBar.setBackgroundImage(UIImage(), forBarMetrics: .Default)
        navigationBar.shadowImage = UIImage()
        navigationBar.translucent = true
        navigationController?.view.backgroundColor = .clearColor()
    }

Swift 3:

if let navigationBar = navigationController?.navigationBar {
        navigationBar.setBackgroundImage(UIImage(), for: .default)
        navigationBar.shadowImage = UIImage()
        navigationBar.isTranslucent = true
        navigationController?.view?.backgroundColor = .clear
    }

This works for sure! Transparent UINavigationBar.

回答2:

If you want change the appearance for all your application, I recommend you to use this:

[[UINavigationBar appearance] setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];

hope that will help

回答3:

In your UIViewController class. You can also use UIAppearance mechanism http://nshipster.com/uiappearance/

And place this

    [[UINavigationBar appearance] setBackgroundImage:[UIImage new]
forBarMetrics:UIBarMetricsDefault];
    [UINavigationBar appearance].shadowImage = [UIImage imageNamed:@"Your image file here"];

into

- ( BOOL ) application:( UIApplication* ) application didFinishLaunchingWithOptions:( NSDictionary* ) launchOptions

回答4:

Transparent UIToolbar:
self.toolbar.setBackgroundImage(UIImage(),
                                forToolbarPosition: UIBarPosition.Any,
                                barMetrics: UIBarMetrics.Default)
self.toolbar.setShadowImage(UIImage(),
                            forToolbarPosition: UIBarPosition.Any)
Transparent UINavigationBar:
self.navigationBar.setBackgroundImage(UIImage(), forBarMetrics: UIBarMetrics.Default)
self.navigationBar.shadowImage = UIImage()
self.navigationBar.translucent = true

回答5:

set following code

Self.navigationcontroller.navigationbar.transculant=yes;

来源：https://stackoverflow.com/questions/21850622/transparent-uinavigationbar

标签

ios

uinavigationcontroller