如何在选择didselectitem到另一个集合视图后从集合视图进行导航

Question

我一直在试图制作一个项目，该项目应该包含collectionView，在从中选择一个项目后，它会跳转到另一个collectionView。

import UIKit 

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate { 
@IBOutlet weak var myCollectionView: UICollectionView! 
var imgURLArray = [String]() 

var nameArray = [String]() 
final let urlString = "https://unembittered-vector.000webhostapp.com/JSON/alljson.txt" 
override func viewDidLoad() { 
    super.viewDidLoad() 
    self.downloadJsonWithURL() 
} 

override func didReceiveMemoryWarning() { 
    super.didReceiveMemoryWarning() 

} 
func downloadJsonWithURL() { 
    let url = NSURL(string: urlString) 
    URLSession.shared.dataTask(with: (url as? URL)!, completionHandler: {(data, response, error) -> Void in 

     if let jsonObj = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) as? NSDictionary { 
      print(jsonObj!.value(forKey: "Materials")!) 

      if let actorArray = jsonObj!.value(forKey: "Materials") as? NSArray { 
       for actor in actorArray{ 
        if let actorDict = actor as? NSDictionary { 
         if let name = actorDict.value(forKey: "name") { 
          self.nameArray.append(name as! String) 
         }/* 
         if let name = actorDict.value(forKey: "dob") { 
          self.dobArray.append(name as! String) 
         } */ 
         if let name = actorDict.value(forKey: "image") { 
          self.imgURLArray.append(name as! String) 
         } 

        } 
       } 
      } 


      OperationQueue.main.addOperation({ 
       self.myCollectionView.reloadData() 
      }) 
     } 
    }).resume() 
} 


func downloadJsonWithTask() { 

    let url = NSURL(string: urlString) 

    var downloadTask = URLRequest(url: (url as? URL)!, cachePolicy: URLRequest.CachePolicy.reloadIgnoringCacheData, timeoutInterval: 20) 

    downloadTask.httpMethod = "GET" 

    URLSession.shared.dataTask(with: downloadTask, completionHandler: {(data, response, error) -> Void in 

     let jsonData = try? JSONSerialization.jsonObject(with: data!, options: .allowFragments) 

     print(jsonData!) 

    }).resume() 
} 


//Number of views 
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int { 

    return imgURLArray.count 

} 

    //Populate view 
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
{ 

    let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! myCell 
    print("test") 
    cell.nameLabel.text = nameArray[indexPath.row] 
    let imgURL = NSURL(string: imgURLArray[indexPath.row]) 

    if imgURL != nil { 
     print("check") 
     let data = NSData(contentsOf: (imgURL as? URL)!) 
     //cell.myImageView.image = UIImage(data: data as! Data) 
     cell.myImageView.image = UIImage(data: data as! Data) 

    } 
    else{ 
     print("error")} 
    //cell.myImageView.image = UIImage(named: array[indexPath.row] + ".JPG") 
    return cell 
} 

/*func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) { 
    let vc = self.storyboard?.instantiateViewController(withIdentifier: "ViewController") as! ViewController 
    //vc.imageString = imgURLArray[indexPath.row] 
    //vc.nameString = nameArray[indexPath.row] 
    //vc.dobString = dobArray[indexPath.row] 

    //cell.myImageView.image = UIImage(named: array[indexPath.row] + ".JPG") 
    //return cell1 

    //self.navigationController?.pushViewController(vc, animated: true)  
}*/ 
} 

Answer 1

这里是你如何能实现你所寻找的一个例子：

1.故事板

2.视图控制器

import UIKit 

class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate 
{ 
    override func viewDidLoad() 
    { 
     super.viewDidLoad() 
    } 

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    { 
     return 10 
    } 

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
    { 
     return collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) 
    } 

    func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) 
    { 
     let controller = self.storyboard?.instantiateViewController(withIdentifier: "SecondViewController") as! SecondViewController 
     self.navigationController?.pushViewController(controller, animated: true) 
    } 
} 

class SecondViewController: UIViewController, UICollectionViewDataSource 
{ 
    override func viewDidLoad() 
    { 
     super.viewDidLoad() 
    } 

    func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int 
    { 
     return 5 
    } 

    func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell 
    { 
     return collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) 
    } 
} 

如果您遇到任何问题，请回复。