didSelectItem 未被调用
didSelectItem not being called
我的 didSelectItemAt
方法没有被调用,控制台也没有打印任何内容。我打开了用户交互,但仍然无法打印出任何内容。我不确定是我的自定义 PinterestStyle 布局导致了这个问题,还是我遗漏了什么。最终目标是进入显示所选单元格配置文件页面的详细视图控制器。我将使用 prepareForSegue
来做到这一点,但是我什至无法让它在点击时打印出单元格的名称。
class PagesCollectionViewController: UICollectionViewController, firebaseHelperDelegate {
var storageRef: StorageReference!{
return Storage.storage().reference()
}
var usersList = [String]()
var authService : FirebaseHelper!
var userArray : [Users] = []
var images: [UIImage] = []
var names: [String] = []
override func viewWillAppear(_ animated: Bool) {
if Global.Location != "" && Global.Location != nil
{
usersList = Global.usersListSent
print(usersList)
self.authService.ListOfUserByLocation(locationName: Global.Location, type: .ListByLocation)
}
}
override func viewDidLoad() {
self.collectionView?.allowsSelection = true
self.collectionView?.isUserInteractionEnabled = true
super.viewDidLoad()
self.authService = FirebaseHelper(viewController: self)
self.authService.delegate = self
setupCollectionViewInsets()
setupLayout()
}
private func setupCollectionViewInsets() {
collectionView!.backgroundColor = .white
collectionView!.contentInset = UIEdgeInsets(
top: 20,
left: 5,
bottom: 49,
right: 5
)
}
private func setupLayout() {
let layout: PinterestLayout = {
if let layout = collectionViewLayout as? PinterestLayout {
return layout
}
let layout = PinterestLayout()
collectionView?.collectionViewLayout = layout
return layout
}()
layout.delegate = self
layout.cellPadding = 5
layout.numberOfColumns = 2
}
func firebaseCallCompleted(data: AnyObject?, isSuccess: Bool, error: Error?, type: FirebaseCallType) {
if(type == .ListByLocation) {
if(isSuccess) {
self.userArray.removeAll()
self.images.removeAll()
self.images.removeAll()
if(data != nil) {
let dataDict = data as! NSDictionary
let keyArray = dataDict.allKeys
for i in 0 ..< keyArray.count {
var dict = NSDictionary()
dict = dataDict.object(forKey: keyArray[i]) as! NSDictionary
self.userArray.append(Users.init(data: dict))
}
}
self.collectionView?.reloadData()
}
else {
print(error?.localizedDescription)
SVProgressHUD.dismiss()
}
}
}
}
extension PagesCollectionViewController {
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userArray.count
}
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print(userArray[indexPath.row].name)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(
withReuseIdentifier: "PagesCollectionViewCell",
for: indexPath) as! PagesCollectionViewCell
cell.nameLabel.text = userArray[indexPath.row].name
if let imageOld = URL(string: userArray[indexPath.row].photoURL){
cell.photo.sd_setImage(
with: imageOld,
placeholderImage: nil,
options: [.continueInBackground, .progressiveDownload]
)
}
return cell
}
}
extension PagesCollectionViewController : PinterestLayoutDelegate {
func collectionView(collectionView: UICollectionView,
heightForImageAtIndexPath indexPath: IndexPath,
withWidth: CGFloat) -> CGFloat {
var image: UIImage?
let url = URL(string: userArray[indexPath.row].photoURL)
let data = try? Data(contentsOf: url!)
image = UIImage(data: data!)
return (image?.height(forWidth: withWidth))!
}
func collectionView(collectionView: UICollectionView,
heightForAnnotationAtIndexPath indexPath: IndexPath,
withWidth: CGFloat) -> CGFloat {
return 30
}
}
检查2个条件:-
- 确保您已将委托设置为 UICollectionView
- 确保 PageCollectionCell 中的内容类似于未启用用户交互的图像。如果启用图像用户交互,则不会调用 didSelectItemAt。
正如 Manish Mahajan 所说,快速解决方法是:
在 cellForItemAt 函数中将 contentView 设置为不可点击
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
cell.contentView.isUserInteractionEnabled = false
return cell
}
我的 didSelectItemAt
方法没有被调用,控制台也没有打印任何内容。我打开了用户交互,但仍然无法打印出任何内容。我不确定是我的自定义 PinterestStyle 布局导致了这个问题,还是我遗漏了什么。最终目标是进入显示所选单元格配置文件页面的详细视图控制器。我将使用 prepareForSegue
来做到这一点,但是我什至无法让它在点击时打印出单元格的名称。
class PagesCollectionViewController: UICollectionViewController, firebaseHelperDelegate {
var storageRef: StorageReference!{
return Storage.storage().reference()
}
var usersList = [String]()
var authService : FirebaseHelper!
var userArray : [Users] = []
var images: [UIImage] = []
var names: [String] = []
override func viewWillAppear(_ animated: Bool) {
if Global.Location != "" && Global.Location != nil
{
usersList = Global.usersListSent
print(usersList)
self.authService.ListOfUserByLocation(locationName: Global.Location, type: .ListByLocation)
}
}
override func viewDidLoad() {
self.collectionView?.allowsSelection = true
self.collectionView?.isUserInteractionEnabled = true
super.viewDidLoad()
self.authService = FirebaseHelper(viewController: self)
self.authService.delegate = self
setupCollectionViewInsets()
setupLayout()
}
private func setupCollectionViewInsets() {
collectionView!.backgroundColor = .white
collectionView!.contentInset = UIEdgeInsets(
top: 20,
left: 5,
bottom: 49,
right: 5
)
}
private func setupLayout() {
let layout: PinterestLayout = {
if let layout = collectionViewLayout as? PinterestLayout {
return layout
}
let layout = PinterestLayout()
collectionView?.collectionViewLayout = layout
return layout
}()
layout.delegate = self
layout.cellPadding = 5
layout.numberOfColumns = 2
}
func firebaseCallCompleted(data: AnyObject?, isSuccess: Bool, error: Error?, type: FirebaseCallType) {
if(type == .ListByLocation) {
if(isSuccess) {
self.userArray.removeAll()
self.images.removeAll()
self.images.removeAll()
if(data != nil) {
let dataDict = data as! NSDictionary
let keyArray = dataDict.allKeys
for i in 0 ..< keyArray.count {
var dict = NSDictionary()
dict = dataDict.object(forKey: keyArray[i]) as! NSDictionary
self.userArray.append(Users.init(data: dict))
}
}
self.collectionView?.reloadData()
}
else {
print(error?.localizedDescription)
SVProgressHUD.dismiss()
}
}
}
}
extension PagesCollectionViewController {
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return userArray.count
}
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
print(userArray[indexPath.row].name)
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(
withReuseIdentifier: "PagesCollectionViewCell",
for: indexPath) as! PagesCollectionViewCell
cell.nameLabel.text = userArray[indexPath.row].name
if let imageOld = URL(string: userArray[indexPath.row].photoURL){
cell.photo.sd_setImage(
with: imageOld,
placeholderImage: nil,
options: [.continueInBackground, .progressiveDownload]
)
}
return cell
}
}
extension PagesCollectionViewController : PinterestLayoutDelegate {
func collectionView(collectionView: UICollectionView,
heightForImageAtIndexPath indexPath: IndexPath,
withWidth: CGFloat) -> CGFloat {
var image: UIImage?
let url = URL(string: userArray[indexPath.row].photoURL)
let data = try? Data(contentsOf: url!)
image = UIImage(data: data!)
return (image?.height(forWidth: withWidth))!
}
func collectionView(collectionView: UICollectionView,
heightForAnnotationAtIndexPath indexPath: IndexPath,
withWidth: CGFloat) -> CGFloat {
return 30
}
}
检查2个条件:-
- 确保您已将委托设置为 UICollectionView
- 确保 PageCollectionCell 中的内容类似于未启用用户交互的图像。如果启用图像用户交互,则不会调用 didSelectItemAt。
正如 Manish Mahajan 所说,快速解决方法是:
在 cellForItemAt 函数中将 contentView 设置为不可点击
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath)
cell.contentView.isUserInteractionEnabled = false
return cell
}