如何从作为 tableViewCell 一部分的自定义 CollectionViewController 的 didSelectItemAtIndexPath 实例化 ViewController

Question

我想从自定义 tableViewCell（符合 UICollectionViewDelegate, UICollectionDatasource）class 中实例化一个 ViewController，其中嵌入了自定义 CollectionView it.The 选择 CollectionView 的特定部分时需要执行 segue。已尝试使用协议无效！

my custom TableView class :-
   import UIKit


protocol transferDelegate{

func transfer(_: Int)

}


class ParentTableViewCell: UITableViewCell, UICollectionViewDelegate, UICollectionViewDataSource{



@IBOutlet weak var parentCellHeader: UIView!

@IBOutlet weak var feedPostUsername: UILabel!

@IBOutlet weak var feedPostUserDetails: UILabel!

@IBOutlet weak var feedPostDescription: UILabel!

@IBOutlet weak var feedPicturesCollectionView: UICollectionView!

@IBOutlet weak var feedUserProfilePictures: CustomProfilepicture!



var transferingDelegate : transferDelegate?

override func awakeFromNib() {


    super.awakeFromNib()

    feedPicturesCollectionView.dataSource = self
    feedPicturesCollectionView.delegate = self
    feedPicturesCollectionView.pagingEnabled = true
    feedPicturesCollectionView.backgroundColor = UIColor.clearColor()

}




override init(style: UITableViewCellStyle, reuseIdentifier: String?) {
    super.init(style: style, reuseIdentifier: reuseIdentifier)

}




required init?(coder aDecoder: NSCoder) {
    super.init(coder: aDecoder)

}




func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {

    return 1

}

func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    return 10

}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) ->
    UICollectionViewCell {

    let cell = feedPicturesCollectionView.dequeueReusableCellWithReuseIdentifier("FeedPicturesCell", forIndexPath: indexPath) as! FeedPhotosCell



    switch(indexPath.row){

    case 0 :   cell.feedImages.image = UIImage(named: "defaultProfilePic")

    case 1 :   cell.feedImages.image = UIImage(named: "image1")

    case 2 :   cell.feedImages.image = UIImage(named: "image2")

    case 3 :   cell.feedImages.image = UIImage(named: "image3")


    default : cell.feedImages.image = UIImage(named: "defaultProfilePic")

        }

        return cell


}

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

    print(indexPath.row)

    transferingDelegate?.transfer(indexPath.row)


}


}

我的 viewController class : -

import UIKit

class ViewController: UIViewController , UITableViewDelegate, UITableViewDataSource,transferDelegate{

var xibName : String = "HomepageFeedCellHeader"


var lords : [String] = ["name1","name2","name3"]

var que : [String] = ["--","red","blue"]

var desc : [String] = ["abcE","defn","ghi"]

var  menProfilePictures : [UIImage] = [UIImage(named: "image1")!,UIImage(named: "image2")!,UIImage(named: "image3")!]

@IBOutlet weak var parentTableView: UITableView!


var a : ParentTableViewCell = ParentTableViewCell()






override func viewDidLoad() {

    super.viewDidLoad()



    parentTableView.delegate = self
    parentTableView.dataSource = self

    // Do any additional setup after loading the view, typically from a nib.
}


func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
    return lords.count
}

func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
    let cell = parentTableView.dequeueReusableCellWithIdentifier("ParentCell", forIndexPath: indexPath) as! ParentTableViewCell
    a.transferingDelegate = self
    cell.feedPostUsername.text = lords[indexPath.row]
    cell.feedPostUserDetails.text = queens[indexPath.row]
    cell.feedPostDescription.text = desc[indexPath.row]
    cell.feedUserProfilePictures.image = menProfilePictures[indexPath.row]

    return cell
}

func transfer(itemNo : Int) {

    print("call recieved in viewController from item \(itemNo)")

}



}

Answer 1

您的 didSelectItemAtIndexPath 问题已解决。这是您在评论中提到的第二个问题的答案。如果图像不在 navigation 层次结构中，则不能将图像分配给 imageView。你的问题是你 detailImage 是 nil 因为这个 ViewController 没有加载到 window 层次结构中。要解决您的问题，请这样做

imagePopOverScene?.selImage =  menProfilePictures[itemNo]

现在在你的 imagePopOverScene 中声明 selImage 像这样

var selImage: UIImage!

同时在 viewDidLoad 或 imagePopOverSceneVC

中添加以下行

self.detailImage.image = self.selImage

这将解决您的问题

如何从作为 tableViewCell 一部分的自定义 CollectionViewController 的 didSelectItemAtIndexPath 实例化 ViewController

How to instantiate a ViewController from a didSelectItemAtIndexPath of a custom CollectionViewController which is a part of a tableViewCell

ios

swift-protocols

swift2