Uinavigationcontroller and uiviewcontroller

When your program has a hierarchical workflow, it is more suitable to use uinavigationcontroller to manage uiviewcontroller, that is, you can enter the next layer of the interface from the previous layer, after processing on the next page, you can simply return to the previous page. uinavigationcontroller manages uiviewcontroller using stacks.

The code for entering the next interface is as follows:

[Self. navigationcontroller pushviewcontroller: nextcontroller animated: Yes];

The Code returned from the previous interface is as follows:

[Self. navigationcontroller popviewcontrolleranimated: Yes];

When the program uses the pushviewcontroller () function to add viewcontroller to uinavigation controller, uinavigationcontroller automatically adds and displays a (back) Return button, when you click this "back" button, you can return to the original interface.

This running mechanism of uinavigationcoontroller produces this effect. You can go to a deeper interface layer by layer, and then return data in sequence layer by layer, it is very convenient to organize user interfaces in this way.