How can i navigate to mainviewcontroller from subv

问题:

I have just started working with swift, i have created a subview which has a button on it, i would like to use that button to take me to my mainviewcontroller.

i have used same functionality for a different button however having a function in same file allows that button to work the code is below

var playAgainButton = UIButton(frame: CGRectMake(0, 150, 320, 40))
            playAgainButton.setTitle("Play Again", forState: UIControlState.Normal)
            playAgainButton.addTarget(self, action: Selector("startGame"), forControlEvents: UIControlEvents.TouchUpInside)
            playAgainButton.backgroundColor = UIColor.redColor()
            gameOver.addSubview(playAgainButton)

is it possible to use similar code to navigate to a different viewcontroller?

Thanks

回答1:

Are you using storyboards, or is this all in code? If it's in code, create a method like

func goToMainVC() {
    if let navController = self.navigationController {
        navController.popToRootViewControllerAnimated(true)
    }
}

and set the button's target to a selector that calls it.

If you're using storyboards, you have three options:

1. ctrl+drag a connection from your button back to the main view controller (easy, but bad form because it just pushes the main VC back onto the nav controller);
2. Add @IBAction before the fun goToMainVC() method above, then ctrl+drag a connection from your button to the view controller in which it's contained, and then select that outlet method (this is how most people would do it); or
3. The best option is to use an unwind segue, as described here.