[self.navigationController pushViewController:(nonnull UIViewController *) animated:(BOOL)]

[self.navigationController popViewControllerAnimated:(BOOL)];
[self.navigationController popToViewController:(nonnull UIViewController *) animated:(BOOL)];
[self.navigationController popToRootViewControllerAnimated:(BOOL)];

#import "UINavigationController+JNAPushPopCompletionBlock.h"

---------
[self.navigationController pushViewController:viewController animated:YES completion:^{
    // Add code here.
}];

[self.navigationController popViewControllerAnimated:YES completion:^{
    // Add code here.
}];

[self.navigationController popToViewController:viewController animated:YES completion:^{
        // Add code here.
}];

[self.navigationController popToRootViewControllerAnimated:YES completion:^{
    // Add code here.
}];