ios – 透明UINavigationBar

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

把你的viewDidLoad函数放在你的rootViewController这个代码中：

Objective-C的：

[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
    }

这是肯定的！ Transparent UINavigationBar.