iOS 8中的UITableViewController中的透明UINavigationBar

Question

I have view controllers where I set the navigation bar to be transparent like this:

viewController.navigationController.navigationBar.translucent = YES;
viewController.edgesForExtendedLayout = UIRectEdgeNone;
[viewController.navigationController.navigationBar setBackgroundImage:[UIImage new] forBarMetrics:UIBarMetricsDefault];

For my UIViewController this works fine and I am able to get this:

However, when I am using a UITableViewController it doesn't quite work and I get this:

It't the grey background in the navigation bar that I can't get rid of. I am experiencing this issue in iOS 8.3. I have tested it in iOS 7.1 and there it works fine.

EDIT:

I have tried setting the following without success:

tableViewController.navigationController.navigationBar.shadowImage = [UIImage new];
tableViewController.navigationController.navigationBar.backgroundColor = [UIColor clearColor];
tableViewController.tableView.backgroundColor = [UIColor clearColor];

Answer 1

There are two ways to do it:

1 . You can override the Navigation Controller class and in the viewDidLoad method of your view controllor just specify this code to change the color of UINavigationBar .

---

self.navigationBar.barStyle = UIBarStyle.blue //   you can give color of your choice
self.navigationBar.tintColor = UIColor.whiteColor() // or UIColor clearColor

2.If you want to do it universally or want to apply the same color of navigation bar throughout the app then use this below code in AppDelegate's :didFinishLaunchingWithOptions method:

---

UINavigationBar.appearance() .barTintColor = UIColor(red: 100.0/255.0, green: 226.0/255.0, blue: 98.0/255.0, alpha: 1.0)  // you can give color of your choice
UINavigationBar.appearance().tintColor = UIColor.whiteColor() // or UIColor clearColor
UINavigationBar.appearance().titleTextAttributes = [NSForegroundColorAttributeName : UIColor.whiteColor()] 

Answer 2

I believe you need to also set shadowImage and the background color to clear. I use the following and it works fine for iOS7 and iOS8 on all controllers.

[self.navigationController.navigationBar setBackgroundImage:[UIImage new]
                                              forBarMetrics:UIBarMetricsDefault];
self.navigationController.navigationBar.shadowImage = [UIImage new];
if ([[[UIDevice currentDevice] systemVersion] floatValue] >= 7.0f){
    self.navigationController.navigationBar.translucent = YES;
}
else{
    self.navigationController.navigationBar.translucent = NO;
}
self.navigationController.view.backgroundColor = [UIColor clearColor];