Ios Swift 3更新中出错-在展开可选值时意外发现nil
我正在尝试将一个图像从“tableview控制器”分割到一个单独的视图中，在这个视图中可以“全屏”查看图像。在我升级到Swift 3之前，我使用的代码工作得非常好。我一直在阅读有关展开可选值的内容，但我不知道这里的错误是什么 谢谢 错误所在的代码行：Ios Swift 3更新中出错-在展开可选值时意外发现nil,ios,swift,uitableview,segue,swift3,Ios,Swift,Uitableview,Segue,Swift3,我正在尝试将一个图像从“tableview控制器”分割到一个单独的视图中，在这个视图中可以“全屏”查看图像。在我升级到Swift 3之前，我使用的代码工作得非常好。我一直在阅读有关展开可选值的内容，但我不知道这里的错误是什么 谢谢 错误所在的代码行： Detailimageview.sd_setImage(with: URL(string:self.sentData1)) 错误：致命错误：在展开可选值时意外发现nil 发生此错误的“全屏”视图控制器： import UIKit cla
Detailimageview.sd_setImage(with: URL(string:self.sentData1))
import UIKit
class PhotoView: UIViewController, UIPopoverPresentationControllerDelegate, UIScrollViewDelegate {
@IBOutlet weak var containerView: UIView!
@IBOutlet weak var scrollView: UIScrollView!
@IBOutlet weak var Detailimageview: UIImageView!
var sentData1:String!
func scrollViewDidZoom(_ scrollView: UIScrollView) {
let imageViewSize = Detailimageview.frame.size
let scrollViewSize = scrollView.bounds.size
let verticalPadding = imageViewSize.height < scrollViewSize.height ? (scrollViewSize.height - imageViewSize.height) / 2 : 0
let horizontalPadding = imageViewSize.width < scrollViewSize.width ? (scrollViewSize.width - imageViewSize.width) / 2 : 0
scrollView.contentInset = UIEdgeInsets(top: verticalPadding, left: horizontalPadding, bottom: verticalPadding, right: horizontalPadding)
}
func viewForZoomingInScrollView(scrollView: UIScrollView) -> UIView? {
return Detailimageview
}
func setZoomScale() {
let imageViewSize = Detailimageview.bounds.size
let scrollViewSize = scrollView.bounds.size
let widthScale = scrollViewSize.width / imageViewSize.width
let heightScale = scrollViewSize.height / imageViewSize.height
scrollView.minimumZoomScale = min(widthScale, heightScale)
scrollView.zoomScale = 1.0
}
override func viewWillLayoutSubviews() {
setZoomScale()
}
override func viewDidLoad() {
super.viewDidLoad()
Detailimageview.sd_setImage(with: URL(string:self.sentData1))
// Do any additional setup after loading the view.
setZoomScale()
}
func prepare(for segue: UIStoryboardSegue, sender: AnyObject?) {
}
func viewForZooming(in scrollView: UIScrollView) -> UIView? {
return containerView
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
@IBAction func DismissView(_ sender: AnyObject) {
self.dismiss(animated: true, completion: nil)
}
@IBAction func showPopup(_ sender: AnyObject) {
let popOverVC = UIStoryboard(name: "Main", bundle: nil).instantiateViewController(withIdentifier: "sbPopUpID") as! PopUpViewController
self.addChildViewController(popOverVC)
popOverVC.view.frame = self.view.frame
self.view.addSubview(popOverVC.view)
popOverVC.didMove(toParentViewController: self)
}
override var prefersStatusBarHidden: Bool {
get {
return true
}
}
import UIKit
class ListViewController: UITableViewController {
var imageURLs = [String]()
let cellVenue = ["Example Venue","Example Venue1","Example Venue2","Example Venue3","Example Venue4","Example Venue5"]
let cellLocation = ["Example Venue, Location","Example Venue, Location1","Example Venue, Location2","Example Venue, Location3","Example Venue, Location4","Example Venue, Location5"]
let cellDate = ["Example Date, 1970","Example Date, 1971","Example Date, 1972","Example Date, 1973","Example Date, 1974","January 1st, 1975"]
override func viewDidAppear(_ animated: Bool) {
super.viewDidAppear(animated)
}
override func viewDidLoad() {
super.viewDidLoad()
imageURLs = ["https://i.imgur.com/bSfVe7l.jpg","https://i.imgur.com/vRhhNFj.jpg","https://i.imgur.com/bSfVe7l.jpg","https://i.imgur.com/vRhhNFj.jpg","https://i.imgur.com/bSfVe7l.jpg"]
self.tableView.separatorStyle = .none
// tableView.indicatorStyle = UIScrollViewIndicatorStyle.white
self.view.backgroundColor = UIColor.black
self.navigationController?.navigationBar.titleTextAttributes = [NSForegroundColorAttributeName: UIColor.white]
navigationController!.navigationBar.barTintColor = UIColor.black
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
override func numberOfSections(in tableView: UITableView) -> Int {
return 1
}
override func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return imageURLs.count
}
override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
let cell: ListViewCell = tableView.dequeueReusableCell(withIdentifier: "Cell") as! ListViewCell
let imageView = cell.viewWithTag(1) as! UIImageView
imageView.sd_setImage(with: URL(string: imageURLs[indexPath.row]))
imageView.sd_setHighlightedImage(with: URL(string: imageURLs[indexPath.row]), options: [.continueInBackground, .progressiveDownload, .avoidAutoSetImage])
cell.cellVenue.text = cellVenue[indexPath.row]
cell.cellLocation.text = cellLocation[indexPath.row]
cell.cellDate.text = cellDate[indexPath.row]
return cell
}
func prepare(for segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "DetailView") {
// segue.destination is correct, xcode keeps switching it to segue.description
let VC = segue.destination as! PhotoView
if let indexpath = self.tableView.indexPathForSelectedRow {
let Imageview = imageURLs[indexpath.row] as String
VC.sentData1 = Imageview
}
}
}
override var prefersStatusBarHidden: Bool {
get {
return true
}
}
看起来这是一个视图生命周期问题<在调用
prepareforsgueviewdiloadviewwillbeenprepareforsgueviewdiloadviewwillbeensentData1sentData1