我需要一些帮助，我一直在寻求帮助，在CollectionView中显示我的firebase存储图像。我正在使用UIImagepicker将图像上传到firebase，但它们没有显示在我的CollectionView中。我尝试了所有不同类型的方法但没有任何效果。
这是我的PhotoVC
class PhotoVC: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, UIImagePickerControllerDelegate, UINavigationControllerDelegate, UIPopoverPresentationControllerDelegate {
@IBOutlet weak var imageGallery: UICollectionView!
@IBOutlet weak var bigImage: UIImageView!
@IBAction func addPhotoButtonPressed(_ sender: Any) {
/* let imagePicker = UIImagePickerController()
imagePicker.sourceType = .photoLibrary
imagePicker.allowsEditing = true
imagePicker.delegate = self
// iPad Settings
imagePicker.modalPresentationStyle = .popover
imagePicker.popoverPresentationController?.delegate = self
imagePicker.popoverPresentationController?.sourceView = view
//view.alpha = 0.5
*/
present(imagePicker, animated: true, completion: nil)
}
@IBOutlet weak var addPhotoButton: UIButton!
var imageArray = [Img]()
var storage = FIRStorage.storage().reference()
var database = FIRDatabase.database().reference()
var ref = FIRDatabase.database().reference(withPath: "images")
var refHandle: UInt!
var userID: String!
let vc = PhotoCell()
var imagePicker: UIImagePickerController!
var imageSelected = false
var selectedImage: UIImage!
var img: Img!
static var imageCache: NSCache<NSString, UIImage> = NSCache()
override func viewDidLoad() {
super.viewDidLoad()
imageGallery.delegate = self
imageGallery.dataSource = self
imagePicker = UIImagePickerController()
imagePicker.delegate = self
imagePicker.allowsEditing = true
FIRDatabase.database().reference().child("posts").observe(.value, with: {(snapshot) in
if let snapshot = snapshot.children.allObjects as? [FIRDataSnapshot] {
self.imageArray.removeAll()
for data in snapshot {
print(data)
if let postDict = data.value as? Dictionary<String, AnyObject> {
let key = data.key
let post = Img(postKey: key, postData: postDict)
print(postDict)
self.imageArray.append(post)
}
}
}
self.imageGallery.reloadData()
})
loadImages()
print(imageArray.count)
}
func imagePickerControllerDidCancel(_ picker: UIImagePickerController) {
picker.dismiss(animated: true)
}
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
if let image = info[UIImagePickerControllerEditedImage] as? UIImage {
selectedImage = image
imageSelected = true
} else {
print("A valid image wasnt selected")
}
imagePicker.dismiss(animated: true, completion: nil)
guard imageSelected == true else {
print("An image must be selected")
return
}
if let imgData = UIImageJPEGRepresentation(selectedImage, 0.2) {
let imgUid = NSUUID().uuidString
let metadata = FIRStorageMetadata()
metadata.contentType = "image/jpeg"
FIRStorage.storage().reference().child("post-pics").child(imgUid).put(imgData, metadata: metadata) { (metadata, error) in
if error != nil {
print("image did not save to firebase storage")
} else {
print("uploded to firebase storage")
let downloadURL = metadata?.downloadURL()?.absoluteString
if let url = downloadURL {
// self.sendToFirebase(imgUrl: url)
}
}
}
}
}
func loadImages() {
let url = URL(string: "http://cdn.bleacherreport.net/images/team_logos/328x328/denver_broncos.png")!
bigImage.kf.setImage(with: url)
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return imageArray.count
}
func collectionView(_ collectionView: UICollectionView,
cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let post = imageArray[indexPath.row]
if let cell = imageGallery.dequeueReusableCell(withReuseIdentifier: "image", for: indexPath) as? PhotoCell {
cell.configCell(post: post)
return cell
} else {
return PhotoCell()
}
}
这是我的viewCell
PhotoCell: UICollectionViewCell {
var photoGallery: UIImageView!
override func awakeFromNib() {
photoGallery = UIImageView(frame: contentView.frame)
photoGallery.contentMode = .scaleAspectFill
photoGallery.clipsToBounds = true
contentView.addSubview(photoGallery)
}
var img: Img!
var likesRef: FIRDatabaseReference!
let currentUser = KeychainWrapper.standard.string(forKey: "uid")
func configCell(post: Img, img: UIImage? = nil) {
self.img = post
if img != nil {
self.photoGallery.image = img
} else {
let ref = FIRStorage.storage().reference(forURL: post.postImg)
ref.data(withMaxSize: 100 * 10000, completion: { (data, error) in
if error != nil {
print(error!)
} else {
if let imgData = data {
if let img = UIImage(data: imgData) {
self.photoGallery.image = img
}
}
}
})
}
这是我的模特
class Img {
private var _postImg: String!
private var _postKey: String!
private var _postRef: FIRDatabaseReference!
var postImg: String {
get {
return _postImg
} set {
_postImg = newValue
}
}
var postKey: String {
return _postKey
}
init(imgUrl: String) {
_postImg = imgUrl
}
init(postKey: String, postData: Dictionary<String, AnyObject>) {
_postKey = postKey
if let postImage = postData["imageUrl"] as? String {
_postImg = postImage
}
_postRef = FIRDatabase.database().reference().child("posts").child(_postKey)
}
func toAnyObject() -> [String: Any] {
return ["imageUrl":_postImg]
}
}