目标C：如何从我当前的ViewController后面的ViewController获取导航控制器

I have ViewController 1 with navigation controller where I'd like to push some other VC. But I have ViewController 2 presented over it not in navigation controller hierarchy. In ViewController 2 I have some methods to minimise it, but I can't reach navigation controller in ViewController 1 to push other VC there. I tried to do it from window with code:I have ViewController 1 with navigation control