How to make the Navigation Bar of an UINavigationController display at the bottom?

问题

Is there any way to make the default navigation bar of an UINavigationController display at the bottom instead of the top? I know that there is an UIToolbar that can be displayed at the bottom, but that one is specific to each view and does not carry the "back" button.

回答1:

If you create your view using a NIB, then it is rather simple - select navigation bar in attributes->bottom bar. If not then you should access navigation bar directly and change its coordinates. In your view controller:

CGRect oldRect = self.navigationController.navigationBar.frame;
self.navigationController.navigationBar.frame = CGRectMake(x, y, oldRect.width, oldRect.height);

where x and y are coordinates to place your navigation bar.

回答2:

Try this :

bottomNav = [[UINavigationBar alloc] initWithFrame:CGRectMake(0.0,  self.view.frame.size.height - 20, self.view.frame.size.width, 44.0)];  
bottomNav.barStyle = UIBarStyleBlackOpaque;  
[self.parentViewController.view addSubview:bottomNav];  

回答3:

I think you can but i don't think it will approved by Apple

@implementation UINavigationBar (CustomBar)
- (void)drawRect:(CGRect)rect {
    self.frame = CGRectMake(0, 436, 320, 44);

}

回答4:

Here is the swift version:

var bottomNav = UINavigationBar(x: 0, y: view.frame.size.height - 20, w: view.frame.size.width, h: 44)
bottomNav.barStyle = UIBarStyle.Black
parentViewController?.view.addSubview(bottomNav)

来源：https://stackoverflow.com/questions/5866283/how-to-make-the-navigation-bar-of-an-uinavigationcontroller-display-at-the-botto