我正在尝试使用图像选择器将图像从图像库上传到服务器。我创建了“上传”操作按钮，但似乎无法做到这一点。需要帮助。这是我的代码。
import UIKit
ViewController类：UIViewController，UICollectionViewDelegate，UICollectionViewDataSource，UICollectionViewDelegateFlowLayout，UIImagePickerControllerDelegate，UINavigationControllerDelegate {
let questionImageArray = btnUploadAction(UIImage)
let correctAns = [0,3,1,4,2,5,6,7,8]
var wrongAns = Array(0..<9)
var wrongImageArray=[UIImage]()
var undoMovesArray = [(first: IndexPath, second: IndexPath)]()
var numberOfMoves = 0
var firstIndexPath: IndexPath?
var secondIndexPath: IndexPath?
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Puzzle"
self.navigationController?.navigationBar.isTranslucent = false
wrongImageArray = questionImageArray
setupViews()
}
@objc func btnSwapAction() {
guard let start = firstIndexPath, let end = secondIndexPath else { return }
myCollectionView.performBatchUpdates({
myCollectionView.moveItem(at: start, to: end)
myCollectionView.moveItem(at: end, to: start)
}) { (finished) in
// update data source here
// print(wrongAns)
self.myCollectionView.deselectItem(at: start, animated: true)
self.myCollectionView.deselectItem(at: end, animated: true)
self.firstIndexPath = nil
self.secondIndexPath = nil
self.wrongImageArray.swapAt(start.item, end.item)
self.wrongAns.swapAt(start.item, end.item)
self.undoMovesArray.append((first: start, second: end))
self.numberOfMoves += 1
self.lblMoves.text = "Moves: \(self.numberOfMoves)"
if self.wrongAns == self.correctAns {
let alert=UIAlertController(title: "You Won!", message: "Congratulations ", preferredStyle: .alert)
let okAction = UIAlertAction(title: "OK", style: .default, handler: nil)
let restartAction = UIAlertAction(title: "Restart", style: .default, handler: { (action) in
self.restartGame()
})
alert.addAction(okAction)
alert.addAction(restartAction)
self.present(alert, animated: true, completion: nil)
}
}
}
func restartGame() {
self.undoMovesArray.removeAll()
wrongAns = Array(0..<9)
wrongImageArray = questionImageArray
firstIndexPath = nil
secondIndexPath = nil
self.numberOfMoves = 0
self.lblMoves.text = "Moves: \(numberOfMoves)"
self.myCollectionView.reloadData()
}
@IBAction func btnUploadAction(_ sender: UIBarButtonItem) {
let myPickerController = UIImagePickerController()
myPickerController.delegate = self as? UIImagePickerControllerDelegate & UINavigationControllerDelegate;
myPickerController.sourceType = UIImagePickerController.SourceType.photoLibrary
self.present(myPickerController, animated: true, completion: nil)
}
@objc func btnUndoAction() {
if undoMovesArray.count == 0 {
return
}
let start = undoMovesArray.last!.first
let end = undoMovesArray.last!.second
myCollectionView.performBatchUpdates({
myCollectionView.moveItem(at: start, to: end)
myCollectionView.moveItem(at: end, to: start)
}) { (finished) in
// update data source here
self.wrongImageArray.swapAt(start.item, end.item)
self.wrongAns.swapAt(start.item, end.item)
self.undoMovesArray.removeLast()
self.numberOfMoves += 1
self.lblMoves.text = "Moves: \(self.numberOfMoves)"
}
}
//MARK: CollectionView
func collectionView(_ collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return 9
}
func collectionView(_ collectionView: UICollectionView, cellForItemAt indexPath: IndexPath) -> UICollectionViewCell {
let cell=collectionView.dequeueReusableCell(withReuseIdentifier: "Cell", for: indexPath) as! ImageViewCVCell
cell.imgView.image=wrongImageArray[indexPath.item]
return cell
}
func collectionView(_ collectionView: UICollectionView, didSelectItemAt indexPath: IndexPath) {
collectionView.deselectItem(at: indexPath, animated: true)
if firstIndexPath == nil {
firstIndexPath = indexPath
collectionView.selectItem(at: firstIndexPath, animated: true, scrollPosition: UICollectionView.ScrollPosition(rawValue: 0))
} else if secondIndexPath == nil {
secondIndexPath = indexPath
collectionView.selectItem(at: secondIndexPath, animated: true, scrollPosition: UICollectionView.ScrollPosition(rawValue: 0))
} else {
collectionView.deselectItem(at: secondIndexPath!, animated: true)
secondIndexPath = indexPath
collectionView.selectItem(at: secondIndexPath, animated: true, scrollPosition: UICollectionView.ScrollPosition(rawValue: 0))
}
}
func collectionView(_ collectionView: UICollectionView, didDeselectItemAt indexPath: IndexPath) {
if indexPath == firstIndexPath {
firstIndexPath = nil
} else if indexPath == secondIndexPath {
secondIndexPath = nil
}
}
func collectionView(_ collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAt indexPath: IndexPath) -> CGSize {
let width = collectionView.frame.width
return CGSize(width: width/3, height: width/3)
}
func setupViews() {
myCollectionView.delegate=self
myCollectionView.dataSource=self
myCollectionView.register(ImageViewCVCell.self, forCellWithReuseIdentifier: "Cell")
myCollectionView.backgroundColor=UIColor.white
self.view.addSubview(myCollectionView)
myCollectionView.leftAnchor.constraint(equalTo: self.view.leftAnchor, constant: 20).isActive=true
myCollectionView.topAnchor.constraint(equalTo: self.view.topAnchor, constant: 20).isActive=true
myCollectionView.rightAnchor.constraint(equalTo: self.view.rightAnchor, constant: -21).isActive=true
myCollectionView.heightAnchor.constraint(equalTo: myCollectionView.widthAnchor).isActive=true
self.view.addSubview(btnUpload)
btnUpload = UIButton()
btnUpload.titleLabel!.text = "Button Label"
btnUpload.titleLabel!.textColor = UIColor.red
btnUpload.titleLabel!.textAlignment = .center
btnUpload.addTarget(self, action: #selector(btnUploadAction), for: .touchUpInside)
self.view.addSubview(btnSwap)
btnSwap.widthAnchor.constraint(equalToConstant: 200).isActive=true
btnSwap.topAnchor.constraint(equalTo: myCollectionView.bottomAnchor, constant: 20).isActive=true
btnSwap.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive=true
btnSwap.heightAnchor.constraint(equalToConstant: 50).isActive=true
btnSwap.addTarget(self, action: #selector(btnSwapAction), for: .touchUpInside)
self.view.addSubview(btnUndo)
btnUndo.widthAnchor.constraint(equalToConstant: 200).isActive=true
btnUndo.topAnchor.constraint(equalTo: btnSwap.bottomAnchor, constant: 30).isActive=true
btnUndo.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive=true
btnUndo.heightAnchor.constraint(equalToConstant: 50).isActive=true
btnUndo.addTarget(self, action: #selector(btnUndoAction), for: .touchUpInside)
self.view.addSubview(lblMoves)
lblMoves.widthAnchor.constraint(equalToConstant: 200).isActive=true
lblMoves.topAnchor.constraint(equalTo: btnUndo.bottomAnchor, constant: 20).isActive=true
lblMoves.centerXAnchor.constraint(equalTo: self.view.centerXAnchor).isActive=true
lblMoves.heightAnchor.constraint(equalToConstant: 50).isActive=true
lblMoves.text = "Moves: \(numberOfMoves)"
}
let myCollectionView: UICollectionView = {
let layout = UICollectionViewFlowLayout()
layout.minimumInteritemSpacing=0
layout.minimumLineSpacing=0
let cv = UICollectionView(frame: CGRect.zero, collectionViewLayout: layout)
cv.allowsMultipleSelection = true
cv.translatesAutoresizingMaskIntoConstraints=false
return cv
}()
var btnUpload: UIButton = {
let btn=UIButton(type: .system)
btn.setTitle("Upload", for: .normal)
btn.titleLabel?.font = UIFont.systemFont(ofSize: 20)
btn.translatesAutoresizingMaskIntoConstraints=false
return btn
}()
let btnSwap: UIButton = {
let btn=UIButton(type: .system)
btn.setTitle("Swap", for: .normal)
btn.titleLabel?.font = UIFont.systemFont(ofSize: 20)
btn.translatesAutoresizingMaskIntoConstraints=false
return btn
}()
let btnUndo: UIButton = {
let btn=UIButton(type: .system)
btn.setTitle("Undo", for: .normal)
btn.setTitleColor(UIColor.red, for: .normal)
btn.translatesAutoresizingMaskIntoConstraints=false
return btn
}()
let lblMoves: UILabel = {
let lbl=UILabel()
lbl.textAlignment = .center
lbl.translatesAutoresizingMaskIntoConstraints=false
return lbl
}()
}