"func prepareForSegue" 不调用 CollectionView

Question

是否可以使用 shouldPerformSegueWithIdentifier 通过以下方法捕捉 segue 的移动：

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

这是我的视图控制器代码：

func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    let poke:Pokemon!

    if inSearchMode {
        poke=filterPokemons[indexPath.row]
    } else {
        poke=pokemonlist[indexPath.row]
    }
    shouldPerformSegueWithIdentifier("PokemonDetailVC", sender: poke);
}

override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
    if segue.identifier == "PokemonDetailVC" {
        if let detailVC = segue.destinationViewController as? PokemonDetailVC{
            if let poke = sender as? Pokemon {
                detailVC.pokemon=poke;
            }
        }
    }
}

故事板 segue 参考

Answer 1

尝试：

performSegueWithIdentifier("Identifier", sender: self)

而不是：

shouldPerformSegueWithIdentifier("Identifier", sender: self)

当我们使用shouldPerformSegueWithIdentifier时，我们可以通过以下方法捕捉segue的移动：

override func shouldPerformSegueWithIdentifier(identifier: String, sender: AnyObject?) -> Bool

检查此 link：Prevent segue in prepareForSegue method?

Answer 2

你需要调用 performSegueWithIdentifier 而不是 shouldPerformSegueWithIdentifier 因为 shouldPerformSegueWithIdentifier 方法让你有机会防止 segue 发生。从此方法返回 NO 会导致 segue 无法执行。

如果您想了解有关 shouldPerformSegueWithIdentifier 的更多详细信息，请查看此 apple documentation

其中 performSegueWithIdentifier 方法允许将数据从源视图控制器传递到目标视图控制器。

所以现在只需像这样调用 performSegueWithIdentifier 而不是 shouldPerformSegueWithIdentifier。

performSegueWithIdentifier("PokemonDetailVC", sender: poke)

在Swift3.0

self.performSegue(withIdentifier: "PokemonDetailVC", sender: poke)

"func prepareForSegue" 不调用 CollectionView

"func prepareForSegue" not calling for CollectionView

storyboard

ios

swift

swift3