prepareForSegue 什么时候被调用？

Question

So here is my situation, I have two view controllers: viewControllerA and tableViewControllerB. On my viewControllerA, I have a button. And when it gets pressed, it will call

self.performSegueWithIdentifier("toControllerB", sender: self)

moreover, I wrote a prepareforSegue function that looks like the following:

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    if (segue.identifier == "toControllerB"){

        var controllerB = segue.destinationViewController as tableViewControllerB
        controllerB.event = self.event
    }

And in my tableViewControllerB I have a function looks like the following

var event = nil
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {

    self.viewDidLoad()
    var cell = tableView.dequeueReusableCellWithIdentifier("controllerBCell") as? ControllerBCell ?? ControllerBCell()
    //some code
    print(event)
    return cell

}

And when I run my app, it seems like this tableview function gets called before the prepareforSegue function in ControllerA. And thus the "event" variable is nil. Therefore, I am wondering is it possible to call prepareforSegue function before this tableview function in controllerB?

Thanks

Answer 1

The chain is something like this.

1. First prepareForSegue is called
2. Then viewDidLoad is called
3. Then cellForRowAtIndexPath is called

I guess the problem is your line

self.viewDidLoad()

This function is called automatically. I just tried rest of the code at my end and it works fine.