ios - collectionView 函数 didSelectItemAt indexPath 将数据传递到下一个 View Controller

Question

我希望 AllWorkoutsVC 中的 collectionView 将 videoCode 字符串数据传递到下一个名为 VideoViewVC 的 viewController。

我的 Collection View 正确地显示了数据，但是我遇到了 didSelectItemAt 函数的问题...此代码运行良好并且不会引发任何警告或错误，只是变量 myPassVideoCode 未传递到目标 View Controller

(为了清楚起见，我删除了一些代码。如果您觉得需要，请询问更多。)

collectionView类

class AllWorkoutsVC: UIViewController, UICollectionViewDelegate, UICollectionViewDataSource {

      var myPassVideoCode = String()



     func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
        if let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "WorkoutsCell", for: indexPath) as? WorkoutsCell {
            let workout = workouts[indexPath.row]
            cell.updateViews(workout: workout)
            print("this is my workouts: " + workout.videoCode)
            return cell
        } else {
            return WorkoutsCell()
        }
    }


    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
        let chosenWorkout = DataService.instance.getAllWorkouts()[indexPath.row] 
        myPassVideoCode = String(chosenWorkout.videoCode)
        print("this is my:  " + myPassVideoCode)//Note: this whole print does not appear in the console either
        performSegue(withIdentifier: "onPlayPressed2", sender: chosenWorkout)
    }


    override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
        if segue.identifier == "onPlayPressed2" {
            let toNextVC = segue.destination as! VideoViewVC
            toNextVC.myPassVideoCode = myPassVideoCode
        }
    }

}

目标类别...

class VideoViewVC: UIViewController, UITableViewDataSource, UITableViewDelegate {

    var myPassVideoCode = String()
    @IBOutlet var videoPlayer: YouTubePlayerView!

    override func viewDidLoad() {
        super.viewDidLoad()
        videoPlayer.loadVideoID(myPassVideoCode)
    }

Answer 1

问题是您在以下位置声明了一个同名 myPassVideoCode 的新本地常量:

 func collectionView(_ collectionView: UICollectionView, didSelectItemAt...

您只需设置myPassVideoCode。因此更改这一行:

let myPassVideoCode = String(chosenWorkout.videoCode)

至:

myPassVideoCode = String(chosenWorkout.videoCode)