【发布时间】：2017-08-11 11:18:17
【问题描述】：
我正在尝试在 UITextField 中传递数据，用户将输入这些数据以进入另一个视图控制器的集合视图中的单元格。
我想在每次有人按下“上传”按钮时创建新的“帖子”以添加到我的提要中，因此“收藏视图”单元格需要以某种方式上传给定信息，然后清除该单元格。
我不知道如何将数据传递给集合视图。
这是我的视图控制器和单元格代码。
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，我的视图控制器中的 'var postCell = segue.destination as！ PostCell'线。错误显示“执行错误”
任何和所有的帮助都会很棒。
【问题讨论】：
标签： ios iphone swift xcode uicollectionviewcell