<分区>
我正在尝试在 UITextField 中传递数据，用户将输入该数据以进入另一个 View Controller 的 Collection View 中的单元格。
我想创建新的“帖子”，以便在每次有人按下“上传”按钮时添加到我的提要中，因此 Collection View 单元格需要以某种方式上传给定的信息，然后清除单元格。
我不知道如何将数据传递到 Collection View 。
这是我的 View Controller 和我的 Cell 代码。
import UIKit
import Firebase
class UploadViewController: UIViewController, UIImagePickerControllerDelegate, UINavigationControllerDelegate {
@IBOutlet weak var previewImage: UIImageView!
@IBOutlet weak var postBtn: UIButton!
@IBOutlet weak var selectBtn: UIButton!
@IBOutlet weak var thisTextField: UITextField!
@IBOutlet weak var thatTextField: UITextField!
var picker = UIImagePickerController()
@IBAction func thisPhotoUpload(_ sender: Any) {
if thisTextField.text != "" || thatTextField.text != ""
{
performSegue(withIdentifier: "segue", sender: self)
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
var postCell = segue.destination as! PostCell
postCell.thisString = thisTextField.text!
postCell.thatString = thatTextField.text!
}
override func viewDidLoad() {
super.viewDidLoad()
picker.delegate = self
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let image = info[UIImagePickerControllerEditedImage] as? UIImage {
self.previewImage.image = image
selectBtn.isHidden = true
postBtn.isHidden = false
}
self.dismiss(animated: true, completion: nil)
}
@IBAction func selectPressed(_ sender: Any) {
picker.allowsEditing = true
picker.sourceType = .photoLibrary
self.present(picker, animated: true, completion: nil)
}
@IBAction func postPressed(_ sender: Any) {
AppDelegate.instance().showActivityIndicator()
let uid = FIRAuth.auth()!.currentUser!.uid
let ref = FIRDatabase.database().reference()
let storage = FIRStorage.storage().reference(forURL: "gs://instagram-f3f20.appspot.com")
let key = ref.child("posts").childByAutoId().key
let imageRef = storage.child("posts").child(uid).child("\(key).jpg")
let data = UIImageJPEGRepresentation(self.previewImage.image!, 0.6)
let uploadTask = imageRef.put(data!, metadata: nil) { (metadata, error) in
if error != nil {
print(error!.localizedDescription)
AppDelegate.instance().dismissActivityIndicatos()
return
}
imageRef.downloadURL(completion: { (url, error) in
if let url = url {
let feed = ["userID" : uid,
"pathToImage" : url.absoluteString,
"likes" : 0,
"author" : FIRAuth.auth()!.currentUser!.displayName!,
"postID" : key] as [String : Any]
let postFeed = ["\(key)" : feed]
ref.child("posts").updateChildValues(postFeed)
AppDelegate.instance().dismissActivityIndicatos()
self.dismiss(animated: true, completion: nil)
}
})
}
uploadTask.resume()
}
}
CollectionViewCell 子类
import UIKit
import Firebase
class PostCell: UICollectionViewCell {
@IBOutlet weak var postImage: UIImageView!
@IBOutlet weak var authorLabel: UILabel!
@IBOutlet weak var likeLabel: UILabel!
@IBOutlet weak var likeBtn: UIButton!
@IBOutlet weak var unlikeBtn: UIButton!
@IBOutlet weak var thisLabel: UILabel!
@IBOutlet weak var thisButton: UIButton!
@IBOutlet weak var thatLabel: UILabel!
@IBOutlet weak var thatButton: UIButton!
var postID: String!
var thisString = String()
var thatString = String()
override func awakeFromNib() {
super.awakeFromNib()
thisLabel.text = thisString
thisButton.setTitle(thisString, for: UIControlState.normal)
thatLabel.text = thisString
thatButton.setTitle(thisString, for: UIControlState.normal)
}
@IBAction func likePressed(_ sender: Any) {
self.likeBtn.isEnabled = false
let ref = FIRDatabase.database().reference()
let keyToPost = ref.child("posts").childByAutoId().key
ref.child("posts").child(self.postID).observeSingleEvent(of: .value, with: { (snapshot) in
if let post = snapshot.value as? [String : AnyObject] {
let updateLikes: [String : Any] = ["peopleWhoLike/\(keyToPost)" : FIRAuth.auth()!.currentUser!.uid]
ref.child("posts").child(self.postID).updateChildValues(updateLikes, withCompletionBlock: { (error, reff) in
if error == nil {
ref.child("posts").child(self.postID).observeSingleEvent(of: .value, with: { (snap) in
if let properties = snap.value as? [String : AnyObject] {
if let likes = properties["peopleWhoLike"] as? [String : AnyObject] {
let count = likes.count
self.likeLabel.text = "\(count) Likes"
let update = ["likes" : count]
ref.child("posts").child(self.postID).updateChildValues(update)
self.likeBtn.isHidden = true
self.unlikeBtn.isHidden = false
self.likeBtn.isEnabled = true
}
}
})
}
})
}
})
ref.removeAllObservers()
}
@IBAction func unlikePressed(_ sender: Any) {
self.unlikeBtn.isEnabled = false
let ref = FIRDatabase.database().reference()
ref.child("posts").child(self.postID).observeSingleEvent(of: .value, with: { (snapshot) in
if let properties = snapshot.value as? [String : AnyObject] {
if let peopleWhoLike = properties["peopleWhoLike"] as? [String : AnyObject] {
for (id,person) in peopleWhoLike {
if person as? String == FIRAuth.auth()!.currentUser!.uid {
ref.child("posts").child(self.postID).child("peopleWhoLike").child(id).removeValue(completionBlock: { (error, reff) in
if error == nil {
ref.child("posts").child(self.postID).observeSingleEvent(of: .value, with: { (snap) in
if let prop = snap.value as? [String : AnyObject] {
if let likes = prop["peopleWhoLike"] as? [String : AnyObject] {
let count = likes.count
self.likeLabel.text = "\(count) Likes"
ref.child("posts").child(self.postID).updateChildValues(["likes" : count])
}else {
self.likeLabel.text = "0 Likes"
ref.child("posts").child(self.postID).updateChildValues(["likes" : 0])
}
}
})
}
})
self.likeBtn.isHidden = false
self.unlikeBtn.isHidden = true
self.unlikeBtn.isEnabled = true
break
}
}
}
}
})
ref.removeAllObservers()
}
}
现在我在我的 View Controller 中收到错误消息 'var postCell = segue.destination as! PostCell' 行。错误显示“错误执行”
任何和所有的帮助都会很棒。