将视图从另一个选项卡的模式推送到导航

Question

I'm quite new to iOS programming and I'm trying to do something that I think is simple but I can't find clear explanation. I'm trying to develop an app with Xcode 6.3 and swift 1.2

I have this :

So I'm in a tab based application. Each tab view are inside navigation controller. D is a modal launch from C . When I click on a button inside D I want to go to B . This is fine. But I would like also to display the top navigation bar with a back button pointing to A . For now when I tried to use the push segue from D to B , B is shown as modal but not part of the navigation controller.

How I have to achieve this easily ? Do I have to recreate all the stack by instantiating each view (A then B) and push everything onto the navigation stack ?

If you know the code to achieve this in objective-c it's fine for me as well.

Answer 1

When I click on a button inside D I want to go to B . This is fine. But I would like also to display the top navigation bar with a back button pointing to A .

You can only go back to A , if it is actually on the navigation stack . So, you will have to somehow push it onto the stack before you can achieve your goal.

As a general hint, if you want a view controller to show the navigation bar, you only have to make sure it's embedded into a navigation controller. When you present a view modally, it will not by default be embedded into a navigation controller. So, as you said D is shown modally from C , just embed D into another navigation controller and instead of making D the destination for the modal segue, make the navigation controller the destination.

Update

If you want to show a back button in B that points to A , even though B was shown modally from D , you will have to hack your way around because A is not on the navigation stack. So, logically, what you have to do is make sure that A is on the navigation stack just before B . I don't think you can do this simply with segues from IB, but rather use code and instantiate the UINavigationController yourself:

- (void)showBModallyWithBackButtonToA
{
    A *a = [[A alloc] init];
    UINavigationController *nav = [[UINavigationController alloc] initWithRootViewController:a];
    B *b = [[B alloc] init];
    [nav pushViewController:b animated:NO];
    [self presentViewController:nav animated:YES completion:nil];
}

This code has to be executed from D , if I understand your setup correctly.

Answer 2

Here is the solution from nburk converted in swift with the use of storyboard :

let a = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("aIdentifier") as! ATableViewController
let nav = UINavigationController(rootViewController: a)
let b = UIStoryboard(name: "Main", bundle: nil).instantiateViewControllerWithIdentifier("bIdentifier") as! BViewController
// b parameters here
// b.parameter1 = variable
nav.pushViewController(b, animated:false)
self.presentViewController(nav, animated:true, completion:nil)

Where aIdentifier and bIdentifier are the identifier you set inside storyboard editor for each view and ATableViewController and BViewController their respective ViewController classes.