如何从“菜单”视图控制器在现有UIViewControllers之间导航？

Question

I have a menu view controller with buttons that should take me to a different view controller. I do not have a navigation controller in my storyboard. Currently I transition to new view controllers using segues, both through storyboard as well as programatically. My menu view controller is presented modally when it is called. How can I navigate to a already instantiated view controller instead of making new ones every time?

Answer 1

You can do this using Unwind segue.

I assume there are three ViewControllers A(Menu),B and C. Now you press button on A and you moved to B, Now you press button on B and moved to C.

Now you wants to come back to ViewController A,

Step 1: Create this function on ViewController A.

@IBAction func unwindToViewControllerA(segue:UIStoryboardSegue){
    //do your stuff here.
}

Step 2: Suppose you have button on ViewController C ,after clicking on that you wants to come back to ViewController A .

-So go to ViewController C in StoryBoard,
-Ctrl+drag from "Go to A View Controller" button to Orange Exit button as shown in image,

-And click on unWindToViewControllerA.

That's it.

Now after clicking on button "Go to A View Controller" you will go to "ViewController A."

I also recommend to read this Technical note from Apple .