如何知道从另一个视图控制器中的 UICollectionViewController 按下了哪个按钮

Question

我正在创建一个应用程序，其中使用了 3 个按钮网格。我为此使用了 UICollectionViewController 并将按钮添加到 UICollectionViewCell 还为每个按钮单击事件添加目标下面的代码

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
        let cell : CollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! CollectionViewCell
        if indexPath.row == 0 {
             cell.btn.addTarget(self, action: "first", forControlEvents: UIControlEvents.TouchUpInside)
             cell.btn.setTitle("1st", forState: .Normal)
        }else if indexPath.row == 1 {
            cell.btn.addTarget(self, action: "second", forControlEvents: UIControlEvents.TouchUpInside)
            cell.btn.setTitle("2nd", forState: .Normal)
        }else if indexPath.row == 2 {            
            cell.btn.addTarget(self, action: "third", forControlEvents: UIControlEvents.TouchUpInside)
            cell.btn.setTitle("3rd", forState: .Normal)
        }
}

每当单击按钮时，视图控制器都会导航到另一个视图控制器代码

var destinationViewController : UIViewController!
func third(){
   destinationViewController = storyboard?.instantiateViewControllerWithIdentifier("AddInventory") as! UIViewController
   navigationController?.pushViewController(destinationViewController, animated: true)
}

但是点击任何按钮都会导航到同一个视图控制器因为我使用段视图控制器，并且对于特定的索引，将显示不同的视图，所以我必须检查从集合视图中选择了哪个按钮我使用标签检查

cell.btn.tag = indexPath.row

但它不起作用我无法访问标签

简而言之，我的问题是如何检查在推送到另一个视图控制器时单击了哪个按钮（来自 collectionview）提前致谢

Answer 1

尝试为您的 destinationViewController 编写一个属性。例如显示索引

然后你可以修改你的func third:

func third(){
   destinationViewController = storyboard?.instantiateViewControllerWithIdentifier("AddInventory") as! UIViewController
   destinationViewController.showIndex = 3;
   navigationController?.pushViewController(destinationViewController, animated: true)
}

不知道我有没有看清楚你的问题

Answer 2

    override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
            let cell : CollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! CollectionViewCell
            if indexPath.row == 0 {
                 cell.btn.addTarget(self, action: "first:", forControlEvents: UIControlEvents.TouchUpInside)
cell.tag = indexpath.row
                 cell.btn.setTitle("1st", forState: .Normal)
            }else if indexPath.row == 1 {
                cell.btn.addTarget(self, action: "second:", forControlEvents: UIControlEvents.TouchUpInside)
cell.tag = indexpath.row
                cell.btn.setTitle("2nd", forState: .Normal)
            }else if indexPath.row == 2 {            
                cell.btn.addTarget(self, action: "third:", forControlEvents: UIControlEvents.TouchUpInside)
cell.tag = indexpath.row
                cell.btn.setTitle("3rd", forState: .Normal)
            }
    }

对于目标用户这个

func third(sender:UIButton?){
  var tag:Int = sender.tag
   destinationViewController = storyboard?.instantiateViewControllerWithIdentifier("AddInventory") as! UIViewController
   navigationController?.pushViewController(destinationViewController, animated: true)

}

Answer 3

也许这会对你有所帮助：

override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
    let cell : CollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! CollectionViewCell

    cell.btn.tag = indexPath.row
    cell.btn.addTarget(self, action: "buttonClicked", forControlEvents: UIControlEvents.TouchUpInside)
}

func buttonClicked(sender: UIButton?) {
    let tag = sender.tag

    let destinationViewController = storyboard?.instantiateViewControllerWithIdentifier("AddInventory") as! DestinationViewController
    destinationViewController.fromTag = tag
    navigationController?.pushViewController(destinationViewController, animated: true)
}

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