因此,我正在创建一个博客应用,在家庭新闻提要集合视图(imageCollection,从firebase数据库加载)上,我有一个按钮。此按钮的标题取决于图像的类别。我遇到的问题是在UICollectionViewCell类中执行segue。我用print语句运行了按钮操作,它起作用了。但是,当我尝试添加performSegue时,它不允许我这样做。 (使用未解析的标识符“performSegue”)
有小费吗?谢谢!
附言我还是个新手,所以,如果我有点无知,我道歉
我的ViewController
import UIKit
import Firebase
import FirebaseDatabase
import SDWebImage
class ViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate {
@IBOutlet weak var popImageCollection: UICollectionView!
@IBOutlet weak var imageCollection: UICollectionView!
var customImageFlowLayout = CustomImageFlowLayout()
var popImageFlowLayout = PopImagesFlowLayout()
var images = [BlogInsta]()
var popImageArray = [UIImage]()
var homePageTextArray = [NewsTextModel]()
var dbRef: DatabaseReference!
var dbPopularRef: DatabaseReference!
override func viewDidLoad() {
super.viewDidLoad()
dbRef = Database.database().reference().child("images")
dbPopularRef = Database.database().reference().child("popular")
loadDB()
loadImages()
loadText()
customImageFlowLayout = CustomImageFlowLayout()
popImageFlowLayout = PopImagesFlowLayout()
imageCollection.backgroundColor = .white
popImageCollection.backgroundColor = .white
// Do any additional setup after loading the view, typically from a nib.
}
func loadText() {
dbRef.observe(DataEventType.value, with: { (snapshot) in
if snapshot.childrenCount > 0 {
self.homePageTextArray.removeAll()
for homeText in snapshot.children.allObjects as! [DataSnapshot] {
let homeTextObject = homeText.value as? [String: AnyObject]
let titleHome = homeTextObject?["title"]
let categoryButtonText = homeTextObject?["category"]
self.imageCollection.reloadData()
let homeLabels = NewsTextModel(title: titleHome as! String?, buttonText: categoryButtonText as! String?)
self.homePageTextArray.append(homeLabels)
}
}
})
}
func loadImages() {
popImageArray.append(UIImage(named: "2")!)
popImageArray.append(UIImage(named: "3")!)
popImageArray.append(UIImage(named: "4")!)
self.popImageCollection.reloadData()
}
func loadDB() {
dbRef.observe(DataEventType.value, with: { (snapshot) in
var newImages = [BlogInsta]()
for BlogInstaSnapshot in snapshot.children {
let blogInstaObject = BlogInsta(snapshot: BlogInstaSnapshot as! DataSnapshot)
newImages.append(blogInstaObject)
}
self.images = newImages
self.imageCollection.reloadData()
})
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 1
}
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if collectionView == self.imageCollection {
return images.count
} else {
return popImageArray.count
}
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.imageCollection {
let cell = imageCollection.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! ImageCollectionViewCell
let image = images[indexPath.row]
let text: NewsTextModel
text = homePageTextArray[indexPath.row]
cell.categoryButton.setTitle(text.buttonText, for: .normal)
cell.newTitleLabel.text = text.title
cell.imageView.sd_setImage(with: URL(string: image.url), placeholderImage: UIImage(named: "1"))
return cell
} else {
let cellB = popImageCollection.dequeueReusableCell(withReuseIdentifier: "popCell", for: indexPath) as! PopularCollectionViewCell
let popPhotos = popImageArray[indexPath.row]
cellB.popularImageView.image = popPhotos
cellB.popularImageView.frame.size.width = view.frame.size.width
return cellB
}
}
}
我的ImageCollectionViewCell.swift
import UIKit
import Foundation
class ImageCollectionViewCell: UICollectionViewCell {
@IBOutlet weak var categoryButton: UIButton!
@IBOutlet weak var newTitleLabel: UILabel!
@IBOutlet weak var imageView: UIImageView!
@IBAction func categoryButtonAction(_ sender: Any) {
if categoryButton.currentTitle == "Fashion" {
print("Fashion Button Clicked")
performSegue(withIdentifier: "homeToFashion", sender: self)
}
}
override func prepareForReuse() {
super.prepareForReuse()
self.imageView.image = nil
}
}
最佳答案
您需要一个自定义委托。做这个:
protocol MyCellDelegate {
func cellWasPressed()
}
// Your cell
class ImageCollectionViewCell: UICollectionViewCell {
var delegate: MyCellDelegate?
@IBAction func categoryButtonAction(_ sender: Any) {
if categoryButton.currentTitle == "Fashion" {
print("Fashion Button Clicked")
self.delegate?.cellWasPressed()
}
}
}
// Your viewcontroller must conform to the delegate
class ViewController: MyCellDelegate {
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if collectionView == self.imageCollection {
let cell = imageCollection.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! ImageCollectionViewCell
// set the delegate
cell.delegate = self
// ...... rest of your cellForRowAtIndexPath
}
// Still in your VC, implement the delegate method
func cellWasPressed() {
performSegue(withIdentifier: "homeToFashion", sender: self)
}
}