我在导航控制器中嵌入了AccountViewController。
这就像一个带有关注者列表的AccountProfile屏幕
当我点击关注者时，我将同一个ViewController推到顶部，并填充该用户点击的详细信息。
当我回到导航栏时，我希望返回到之前的用户个人资料屏幕，但是在丢弃顶部之后它会显示新点击的用户屏幕。
这就是我要做的事情
let userId = self.followerUsers[pickedCellIndexPathRow].userId!
let newUserVC = self.storyboard?.instantiateViewController(withIdentifier: "AccountVC") as! AccountViewController
newUserVC.userId = userId
self.navigationController?.pushViewController(newUserVC, animated: true)
这推得很好，但如上所述回去丢弃屏幕，但旧屏幕上有新用户的详细信息
我该如何解决它 - 基本上我应该能够堆叠配置文件并返回它们
AccountViewController：
import UIKit
import SwiftEventBus
class AccountViewController: UIViewController,UICollectionViewDataSource, UICollectionViewDelegate, UICollectionViewDelegateFlowLayout, SegmentClickedDelegate {
func userClickedSegment(segmentNumber: Int){
segmentIndex = segmentNumber
}
var segmentIndex = 0
{
didSet{
collectionView.reloadData()
}
}
@IBOutlet weak var collectionView: UICollectionView!
override func viewDidLoad() {
super.viewDidLoad()
collectionView.dataSource = self
collectionView.delegate = self
let layout = collectionView.collectionViewLayout as? UICollectionViewFlowLayout
layout?.sectionHeadersPinToVisibleBounds = true
}
var model = UserProfileViewModel()
var user: UserResponse?{
didSet{
containerCell.user = self.user
mapUserPhotos()
mapFollowers()
mapFollowing()
if collectionView != nil {
collectionView.reloadData()
}
}
}
public var userId : String="" {
didSet{
model.getUserInfo(userId: userId)
SwiftEventBus.onMainThread(self, name:EventBus.GetUserEvent) { result in
let user = result.object as! UserResponse
self.user = user
}
}
}
var reviews = [UserReviews](){
didSet{
if collectionView != nil {
//collectionView.reloadData()
}
}
}
var followingUsers = [UserFollowing](){
didSet{
if collectionView != nil {
// collectionView.reloadData()
}
}
}
var followerUsers = [UserFollowers](){
didSet{
if collectionView != nil {
//collectionView.reloadData()
}
}
}
func mapUserPhotos(){
if let result = user{
self.reviews = result .reviews!
}
}
func mapFollowers(){
if let result = user{
self.followerUsers = result .followers!
}
}
func mapFollowing(){
if let result = user{
self.followingUsers = result .following!
}
}
// number of sections is 2. Section above search and below search
func numberOfSections(in collectionView: UICollectionView) -> Int {
return 2
}
//number of items for each section. Section above search will have only one and below search will be dynamic as per images we have
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
if section == 0 {
return 1
} else {
switch segmentIndex{//segmentedControl.selectedSegmentIndex {
case 0 :
return self.reviews.count
case 1:
return self.followerUsers.count
case 2:
return self.followingUsers.count
default://break
return self.reviews.count
}
}
}
private struct UserPostsBoard{
static let PhotoCellIdentifier = "UserPhotoCell"
static let FollowerCellIdentifier = "FollowerCell"
static let FollowingCellIdentifier = "FollowingCell"
}
var containerCell = AboveSearchCollectionViewCell()
// cell for item at given indexpath: if section is 0 then return cell above search, if section is 1 then return cell below search
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
if indexPath.section == 0 {
// above search cell
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "aboveSearch", for: indexPath)
containerCell = (cell as? AboveSearchCollectionViewCell)!
containerCell.user = self.user
return cell
} else {
// below search cell
print("self.segmentIndex\(self.segmentIndex)")
//switch item{//self.segmentIndex{//segmentedControl.selectedSegmentIndex {
switch self.segmentIndex{//segmentedControl.selectedSegmentIndex {
case 0 :
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UserPostsBoard.PhotoCellIdentifier, for: indexPath)
let item = self.reviews[indexPath.row]
if let itemCell = cell as? UserPhotoCollectionViewCell{
itemCell.photo = item
}
return cell
case 1:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UserPostsBoard.FollowerCellIdentifier, for: indexPath)
let item = self.followerUsers[indexPath.row]
if let itemCell = cell as? UserFollowersCollectionViewCell{
itemCell.user = item
}
return cell
case 2:
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UserPostsBoard.FollowingCellIdentifier, for: indexPath)
let item = self.followingUsers[indexPath.row]
if let itemCell = cell as? UserFollowingCollectionViewCell{
itemCell.user = item
}
return cell
default://break
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: UserPostsBoard.PhotoCellIdentifier, for: indexPath)
let photoItem = self.self.reviews[indexPath.row]
if let photoCell = cell as? UserPhotoCollectionViewCell{
photoCell.photo = photoItem
}
return cell
}
}
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
if collectionView == self.collectionView {
//pickedCell = collectionView.cellForItem(at: indexPath)
//pickedCellIndexPathRow = indexPath.row
//self.performSegue(withIdentifier: "showUserRating", sender: self)
pickedCellIndexPathRow = indexPath.row
switch segmentIndex{//segmentedControl.selectedSegmentIndex {
case 0 : self.performSegue(withIdentifier: "showUserRating", sender: self)
case 1 : //self.performSegue(withIdentifier: "showFollower", sender: self)
let userId = self.followerUsers[pickedCellIndexPathRow].userId!
let newUserVC = self.storyboard?.instantiateViewController(withIdentifier: "AccountVC") as! AccountViewController
newUserVC.userId = userId
self.navigationController?.pushViewController(newUserVC, animated: true)//push(avc, animated: true, completion: nil)
//self.navigationController?.popViewController(animated: false)
//case 2 : self.performSegue(withIdentifier: "showFollower", sender: self)
default: break
}
}
}
var pickedCellIndexPathRow = 0
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
if indexPath.section == 0 {
return CGSize(width: collectionView.frame.width, height: 200)
}else{
switch segmentIndex{//segmentedControl.selectedSegmentIndex {
case 0 :
let width = (collectionView.frame.width / 3) - 1
return CGSize(width: width, height: width)
default:
return CGSize(width: collectionView.frame.width, height: 80)
}
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAt section: Int) -> CGFloat {
return 1.0
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAt section: Int) -> CGFloat {
return 1.0
}
// implementation of function viewForSupplementaryElementOfKind, for section header of collectionView
func collectionView(_ collectionView: UICollectionView, viewForSupplementaryElementOfKind kind: String, at indexPath: IndexPath) -> UICollectionReusableView {
// returning the search bar for header
let segmentView = collectionView.dequeueReusableSupplementaryView(ofKind: UICollectionElementKindSectionHeader, withReuseIdentifier: "search", for: indexPath) as! TopBarCollectionReusableView
segmentView.delegate = self
return segmentView
}
// size for header in section: since we have 2 sections, collectionView will ask size for header for both sections so we make section header of first section with height 0 and width 0 so it remains like invisible.
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, referenceSizeForHeaderInSection section: Int) -> CGSize {
// if section is above search bar we need to make its height 0
if section == 0 {
return CGSize(width: 0, height: 0)
}
// for section header i.e. actual search bar
return CGSize(width: collectionView.frame.width, height: 50)
}
}
答案 0 :(得分：0)
好的，我正在使用SwiftEventBus，它在网络调用返回响应时填充字段。
愚蠢的是，我忘了将它包括在课堂中 - 所以所有实例都会在没有它的情况下进行更新
override func viewWillDisappear(_ animated: Bool) {
super.viewWillDisappear(animated)
SwiftEventBus.unregister(self)
}