iOS:Add view below navigation bar across viewControllers

问题

I have a project like this:

But I'm trying to figure out how to add a banner below the navigation bar across the navigation bar in a way where can I hide it if is need it. Any of you knows how can I do this?

回答1:

plz use TSMessages.

This library provides an easy to use class to show little notification views on the top of the screen

https://github.com/KrauseFx/TSMessages

回答2:

In the main view controller implement the protocol UINavigationControllerDelegate and in the selector navigationController:didShowViewController:animated: you can manipulate the view controller presented by the navigation controller. e.g:

@interface ViewController () <UINavigationControllerDelegate>
@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    self.navigationController.delegate = self;
}

-(void)navigationController:(UINavigationController *)navigationController didShowViewController:(UIViewController *)viewController animated:(BOOL)animated{

    UIView *banner = [[UIView alloc] initWithFrame:CGRectMake(0, navigationController.navigationBar.frame.size.height + 10,
                                                              viewController.view.bounds.size.width,30)];
    banner.backgroundColor = [UIColor blueColor];

    [viewController.view addSubview:banner];
}

@end

In this example ViewController should be the first view controller presented for the UINavigationController.

I uploaded an example on github

Hope it helps