当我从列表重新排序的桌面视图中点击回来时，我的收藏夹视图没有重新加载。
我已经阅读了一些主题，但我不知道出了什么问题。有人能找到吗？
我可以将代码的一部分放在一个独立的swift文件中并包含这个ViewController。是的，怎么样？因为我在更多ViewControllers中使用它。
以下是我的代码。
非常感谢。
import UIKit
import AVFoundation
class CollectionViewController: UICollectionViewController {
@IBOutlet var soundBoard: UICollectionView!
var list = ["January","February","March","April","May","June", "July","August","September","October","November", "December"]
var bgColor = [""]
var buttonOn: Bool = true
override func viewDidLoad() {
super.viewDidLoad()
let blockItems = UserDefaults.standard.object(forKey:"soundboard")
if(blockItems != nil) {
list = blockItems as! [String]
}
let itemSize = UIScreen.main.bounds.width/2 - 2
let itemHeight = itemSize / 2
let layout = UICollectionViewFlowLayout()
layout.sectionInset = UIEdgeInsetsMake(3, 0, 3, 0)
layout.itemSize = CGSize(width: itemSize, height: itemHeight)
layout.minimumInteritemSpacing = 3
layout.minimumLineSpacing = 3
soundBoard.collectionViewLayout = layout
}
override func viewWillAppear(_ animated: Bool) {
super.viewWillAppear(true)
self.collectionView!.reloadData()
}
// MARK: - Collection View
override func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of items
return list.count
}
override func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> MyCollectionViewCell {
let cell = collectionView.dequeueReusableCell(withReuseIdentifier: "cell", for: indexPath) as! MyCollectionViewCell
cell.cellTitle.text = list[indexPath.row]
return cell
}
override func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
Speak(currentTitle: list[indexPath.row])
}
// MARK: - Speak function
let synth = AVSpeechSynthesizer()
var myUtterance = AVSpeechUtterance(string: "")
func Speak(currentTitle: String) {
if !synth.isSpeaking {
// Controleert volume
let volume = AVAudioSession.sharedInstance().outputVolume
if volume < 0.5 {
MuteButton()
}
// Spreekt de tekst uit
let myUtterance = AVSpeechUtterance(string: currentTitle)
myUtterance.rate = 0.4
myUtterance.volume = 1
if let theVoice = UserDefaults.standard.object(forKey:"voice") {
myUtterance.voice = AVSpeechSynthesisVoice(language: theVoice as? String)
}
synth.speak(myUtterance)
}
}
func MuteButton() {
let alertController = UIAlertController(title: "Check your volume", message:
"Please check your volume or mute button.", preferredStyle: UIAlertControllerStyle.alert)
alertController.addAction(UIAlertAction(title: "Close", style: UIAlertActionStyle.default,handler: nil))
self.present(alertController, animated: true, completion: nil)
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: -- Save UserDefaults
func save() {
UserDefaults.standard.set(self.list, forKey:"soundboard")
UserDefaults.standard.synchronize()
self.collectionView?.reloadData()
}
// MARK: -- Add new sound item
@IBAction func addNew(_ sender: Any) {
let alertController = UIAlertController(title: "Create a new sound", message: "", preferredStyle: UIAlertControllerStyle.alert)
alertController.addTextField { (textField: UITextField) in
textField.keyboardAppearance = .dark
textField.keyboardType = .default
textField.autocorrectionType = .default
textField.placeholder = "Type something here"
textField.clearButtonMode = .whileEditing
}
alertController.addAction(UIAlertAction(title: "Create", style: .default) { [weak alertController] _ in
if let alertController = alertController {
let loginTextField = alertController.textFields![0] as UITextField
self.list.append( loginTextField.text!)
self.save()
}
})
alertController.addAction(UIAlertAction(title: "Cancel", style: UIAlertActionStyle.default,handler: nil))
self.present(alertController, animated: true, completion: nil)
}
}
答案 0 :(得分：0)
我看到一些可能出错的事情。但是，在其他视图控制器中查看代码会有所帮助。
首先，您确定要正确重新排序模型阵列吗？请记住，在swift中，数组是值类型。这意味着如果将数组传递给另一个视图，则表示您正在传递该数组的副本而不是集合视图控制器中的数组。将模型数组包装在可以传递引用的对象中可能是个更好的主意。更多关于here。
将重新加载与模型中的更改（而不是视图生命周期）联系起来也更好。要使用当前代码执行此操作，您可以执行以下操作：
var list = ["January","February","March","April","May","June", "July","August","September","October","November", "December"] {
didSet {
self.collectionView?.reloadData()
// or
self.soundBoard.reloadData()
// I'm confused about which collection view you're using/trying to reload.
}
}
如果您有任何疑问，请与我们联系。我会密切关注，如果需要可以编辑我的答案。
答案 1 :(得分：0)
这是另一个ViewController的代码，您可以在其中重新排序行，并可以点击＆lt;回来。
import UIKit
class soundboardTableViewController: UITableViewController {
var list = ["January","February","March","April","May","June", "July","August","September","October","November", "December"]
override func viewDidLoad() {
super.viewDidLoad()
self.navigationItem.rightBarButtonItem = self.editButtonItem
let blockItems = UserDefaults.standard.object(forKey:"soundboard")
if(blockItems != nil) {
list = blockItems as! [String]
}
}
// MARK: - Table view data source
override func numberOfSections(in tableView: UITableView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of rows
return list.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCell(withIdentifier: "cell", for: indexPath)
cell.textLabel?.text = list[indexPath.row]
return cell
}
// Override to support conditional editing of the table view.
override func tableView(_ tableView: UITableView, canEditRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the specified item to be editable.
return true
}
/* Override to support editing the table view.*/
override func tableView(_ tableView: UITableView, commit editingStyle: UITableViewCellEditingStyle, forRowAt indexPath: IndexPath) {
if editingStyle == .delete {
list.remove(at: indexPath.row)
UserDefaults.standard.set(self.list, forKey:"soundboard")
UserDefaults.standard.synchronize()
tableView.reloadData()
}
}
// Override to support rearranging the table view.
override func tableView(_ tableView: UITableView, moveRowAt indexPath: IndexPath, to: IndexPath) {
/*let itemToMove = list[indexPath.row]
list.remove(at: indexPath.row)
list.insert(itemToMove, at: indexPath.row)
UserDefaults.standard.set(self.list, forKey:"soundboard")
UserDefaults.standard.synchronize()*/
let itemToMove = list[indexPath.row]
list.remove(at: indexPath.row)
list.insert(itemToMove, at: to.row)
UserDefaults.standard.set(self.list, forKey:"soundboard")
}
override func setEditing(_ editing: Bool, animated: Bool) {
super.setEditing(editing, animated: animated)
if(self.isEditing) {
}
}
// Override to support conditional rearranging of the table view.
override func tableView(_ tableView: UITableView, canMoveRowAt indexPath: IndexPath) -> Bool {
// Return false if you do not want the item to be re-orderable.
return true
}
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
}
答案 2 :(得分：0)
这里发生了两件事。首先，您似乎在CollectionViewController中有两个不同的集合视图; collectionView继承自您声明的超类和soundboard。在viewWillAppear中，您告诉collectionView重新加载。如果这不是IB中的那个，那么什么都不会起作用。
第二个问题是，在soundboardTableViewController中，您使用正确的数据更新用户默认值，在CollectionViewController中加载视图后，您永远不会读取它。
你应该移动它：
let blockItems = UserDefaults.standard.object(forKey:"soundboard")
if(blockItems != nil) {
list = blockItems as! [String]
}
进入viewWillAppear，然后验证您是否告诉正确的集合视图重新加载。