从 UICollectionViewCell 执行 Segue
Perform Segue from UICollectionViewCell
所以我正在创建一个博客应用程序,在主页新闻提要 collection 视图(imageCollection,从 firebase 数据库加载)上我有一个按钮。此按钮标题取决于图像的类别。我遇到的问题是在 UICollectionViewCell class 中执行 segue。我 运行 带有 print 语句的按钮动作,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')
有什么建议吗?谢谢!
P.S。我对 swift 还是很陌生,所以如果我有点忽略运行t,我深表歉意
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
}
}
您应该使用自己的委托。已经描述过了here
performSegue(withIdentifier:sender:)
无法在单元格中工作,因为它是 UIViewController 方法。
你也可以use of closure
您需要一个自定义委托。这样做:
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)
}
}
所以我正在创建一个博客应用程序,在主页新闻提要 collection 视图(imageCollection,从 firebase 数据库加载)上我有一个按钮。此按钮标题取决于图像的类别。我遇到的问题是在 UICollectionViewCell class 中执行 segue。我 运行 带有 print 语句的按钮动作,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')
有什么建议吗?谢谢!
P.S。我对 swift 还是很陌生,所以如果我有点忽略运行t,我深表歉意
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
}
}
您应该使用自己的委托。已经描述过了here
performSegue(withIdentifier:sender:)
无法在单元格中工作,因为它是 UIViewController 方法。
你也可以use of closure
您需要一个自定义委托。这样做:
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)
}
}