因此，我正在制作一个应用程序，其中主 View 将显示两组集合 View 。我正在尝试根据发布的图像中的参数过滤信息的发送方式以及如何将其分配到这两个collectionview中。我的应用因此错误而崩溃。
Thread 1: Fatal error: Unexpectedly found nil while unwrapping an Optional value
下面，我放所有代码。
import UIKit
import Parse
class HomeViewController: UIViewController{
//VAR ARRAYS - LOST
var userslost = [String: String]()
var addresslost = [String]()
var breedlost = [String]()
var phonelost = [String]()
var usernameslost = [String]()
var imageFileslost = [PFFile]()
//VAR ARRAYS - FOUND
var usersfound = [String: String]()
var addressfound = [String]()
var breedfound = [String]()
var phonefound = [String]()
var usernamesfound = [String]()
var imageFilesfound = [PFFile]()
//@IBOUTLETS
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var lostView: UIView!
@IBOutlet weak var foundView: UIView!
@IBOutlet weak var lostCollectionView: UICollectionView!
@IBOutlet weak var foundCollectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
//QUERY LOST
let querylost = PFQuery(className: "Post")
querylost.whereKey("lostfound", equalTo: "lost")
querylost.findObjectsInBackground { (objects, error) in
if let posts = objects {
for post in posts {
self.addresslost.append(post["address"] as! String)
self.breedlost.append(post["breed"] as! String)
self.usernameslost.append(self.userslost[post["userid"] as! String]!)
self.imageFileslost.append(post["imageFile"] as! PFFile)
}
}
}
// QUERY FOUND
let queryfound = PFQuery(className: "Post")
queryfound.whereKey("lostfound", equalTo: "found")
queryfound.findObjectsInBackground { (objects, error) in
if let posts = objects {
for post in posts {
self.addressfound.append(post["address"] as! String)
self.breedfound.append(post["breed"] as! String)
self.usernamesfound.append(self.userslost[post["userid"] as! String]!) **--> ERROR IS HERE**
self.imageFilesfound.append(post["imageFile"] as! PFFile)
}
}
}
//TO SHOW DATA
scrollView.delegate = self
lostCollectionView.delegate = self
lostCollectionView.dataSource = self
foundCollectionView.delegate = self
foundCollectionView.dataSource = self
// Do any additional setup after loading the view.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}
// START OF EXTENSIONS FOR COLLECTION VIEWS
extension HomeViewController: UICollectionViewDelegate, UICollectionViewDataSource {
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == self.lostCollectionView {
return addresslost.count
//DUDA #2
}
else {
return addressfound.count
//DUDA #2
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.lostCollectionView {
let cell: LostCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "Lostcell", for: indexPath) as! LostCollectionViewCell
//TIENES QUE IGUALAR LOS @IBOUTLETS DEL CELL (SPECIFICOS A LOST) Y IGUALARLOS CON EL ARRAY DE PARSE QUE PUEDES ENCONTRAR EN VARS ARRIBA
cell.adressLostLabel.text = addresslost[indexPath.row]
cell.breedLostLabel.text = breedlost[indexPath.row]
cell.phoneLostLabel.text = phonelost[indexPath.row]
imageFileslost[indexPath.row].getDataInBackground { (data, error) in
if let imageData = data {
if let imageToDisplay = UIImage(data: imageData) {
cell.postedImage.image = imageToDisplay
}
}
}
return cell
}
else {
let cell: FoundCollectionViewCell = collectionView.dequeueReusableCell(withReuseIdentifier: "Foundcell", for: indexPath) as! FoundCollectionViewCell
cell.adressFoundLabel.text = addressfound[indexPath.row]
cell.breedFoundLabel.text = breedfound[indexPath.row]
cell.phoneFoundLabel.text = phonefound[indexPath.row]
imageFilesfound[indexPath.row].getDataInBackground { (data, error) in
if let imageData = data {
if let imageToDisplay = UIImage(data: imageData) {
cell.postedImage.image = imageToDisplay
}
}
}
return cell
}
}
}
//SCROLL
extension HomeViewController: UIScrollViewDelegate{
func scrollViewDidScroll(_ scrollView: UIScrollView) {
print(scrollView)
}
}
可以在以下代码行中找到错误:
self.usernamesfound.append(self.userslost[post["userid"] as! String]!)
最佳答案
请插入它，它应该可以工作:
self.usernamesfound.append(self.userslost [post [“userid”] as？String]？)
关于ios - 尝试将数据从Parse填充到CollectionView中时出现查询错误，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50780377/