通过navigationController传递带有segue的数据 [英] Passing data with segue through navigationController

问题描述

我正在尝试将数据从一个viewController推送到另一个。我已将viewController连接到另一个ViewController的navigationController，然后将标识符设置为showItemSegue。我在这两行中出错：

I'm trying to push data from one viewController to another. I've connected a viewController to another ViewController's navigationController and then set the identifier to "showItemSegue". I get an error in these two lines:

var detailController = segue.destinationViewController as ShowItemViewController
detailController.currentId = nextId!

图片说明：

代码：

override func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {


    nextId = itemArray?.objectAtIndex(indexPath.row).objectForKey("objectId") as? NSString

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

}


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

    if (segue.identifier == "showItemSegue") {
        var detailController = segue.destinationViewController as ShowItemViewController
        detailController.currentId = nextId!
    }

}

推荐答案

segue的目标视图控制器是 UINavigationController 。您需要让它的顶视图控制器到达真正的目标视图控制器：

The destination view controller of the segue is the UINavigationController. You need to ask it for its top view controller to get to the real destination view controller:

override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
    if segue.identifier == "showItemSegue" {
        let navController = segue.destination as! UINavigationController
        let detailController = navController.topViewController as! ShowItemViewController
        detailController.currentId = nextId!
    }
}

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