我遇到了一个问题，我实现了一种从didSelectRowAt打开URL来打开查看位置时显示的网站的方法。但是，由于某种原因，它不起作用-但我的打印语句在控制台中显示，但是没有启动它的操作。谁能检查我错过了什么。感谢您的帮助。
这是我的代码：
import UIKit
import Social
import CoreLocation
class DetailsViewController: BaseViewController, UITableViewDelegate, UITableViewDataSource{
@IBOutlet weak var tableView: UITableView!
var nearMeIndexSelected = NearMeIndexTitle()
var place: Place!
var coordinate :CLLocationCoordinate2D?
var nearMeRequest : NearMeRequest!
var locationManager = CLLocationManager()
let infoCellId = "info-cell"
let interactiveCellId = "interactive-cell"
let directionsSegueId = "directions-segue"
let gallerySegueId = "gallery-segue"
@IBOutlet weak var activityIndicator: UIActivityIndicatorView!
var annotation: ARAnnotation!
override func viewDidLoad() {
super.viewDidLoad()
if self.place != nil {
self.title = place.placeName
self.tableView.delegate = self
self.tableView.dataSource = self
self.loadDetailInfo()
print("Place is not nil")
} else {
print("Place is nil")
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func numberOfSections(in tableView: UITableView) -> Int {
return 4
}
func tableView(_ tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
if section == 0 {
return 4
}
else if section == 1 {
return 0
}
else if section == 2 {
return 1
}
else {
return 1
}
}
func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell {
var cellId = infoCellId
if indexPath.section != 0 {
cellId = interactiveCellId
}
let cell: UITableViewCell = self.tableView.dequeueReusableCell(withIdentifier: cellId)! as UITableViewCell
var key = "Not Available"
var value = "Not Available"
if indexPath.section == 0 {
if indexPath.row == 0 {
key = "Name"
if self.place.placeName.characters.count > 0 {
value = self.place.placeName
}
} else if indexPath.row == 1 {
key = "Address"
if let address = self.place.address {
if address.characters.count > 0 {
value = address
}
}
} else if indexPath.row == 2 {
key = "Phone number"
if let phoneNumber = self.place.phoneNumber {
if phoneNumber.characters.count > 0 {
value = phoneNumber
}
}
} else if indexPath.row == 3 {
key = "Website"
if let website = self.place.website {
if website.characters.count > 0 {
value = website
}
}
}
}
else if indexPath.section == 2 {
key = "Get Directions"
} else {
key = "Photos of \(self.place.placeName)"
}
if indexPath.section == 0 {
cell.textLabel?.text = key
cell.detailTextLabel?.text = value
} else {
cell.textLabel?.text = key
}
return cell
}
func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
// MARK: Website Opener
if indexPath.section == 0 {
if indexPath.row == 3 {
print("it works")
if let website = place.website {
if let url = URL(string: "\(place.website)") {
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
} else { return }
}
if indexPath.row == 1 {
if let coordinate = place.location?.coordinate {
if let url = URL(string:"http://maps.apple.com/maps?daddr=\(coordinate.latitude),\(coordinate.longitude)") {
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
}
}
if indexPath.row == 2 {
guard let phoneNumber = self.place.phoneNumber,
phoneNumber.count > 0,
let url = URL(string: "tel:\(phoneNumber.addingPercentEncoding(withAllowedCharacters: .urlPathAllowed)!)")
else { return }
if UIApplication.shared.canOpenURL(url) {
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
} else { return }
}
else if indexPath.section == 2 {
self.performSegue(withIdentifier: directionsSegueId, sender: self)
} else {
if let photoReferences = self.place.photoReferences {
if photoReferences.count != 0 {
self.performSegue(withIdentifier: gallerySegueId, sender: self)
return
}
}
// View Photo button
let alertController = UIAlertController(title: "No photos", message: "Sorry, but there are no photos found for this place.", preferredStyle: .alert)
let cancelAction = UIAlertAction(title: "Ok", style: .cancel) { action in
// ...
}
alertController.addAction(cancelAction)
self.present(alertController, animated: true, completion: nil)
}
}
func tableView(_ tableView: UITableView, titleForHeaderInSection section: Int) -> String? {
if section == 0 {
return " Info"
}
else if section == 1{
return ""
}
else if section == 2 {
return " Navigation"
} else {
return " Photo"
}
}
override func prepare(for segue: UIStoryboardSegue, sender: Any?) {
if segue.identifier == directionsSegueId {
let controller = segue.destination as! DirectionsViewController
controller.place = self.place
} else if segue.identifier == gallerySegueId {
let navController = segue.destination as! UINavigationController
let galleryController = navController.viewControllers[0] as! GalleryViewController
galleryController.place = self.place
}
}
func generatePlaceUrl() -> URL {
let placeNamePlus = self.place.placeName.replacingOccurrences(of: " ", with: "+")
var urlString = "https://www.google.com/maps/place/" + placeNamePlus
if let addressPlus = self.place.address?.replacingOccurrences(of: " ", with: "+") {
urlString = urlString + "+" + addressPlus
}
let url = URL.init(string: urlString)
if let finalUrl = url {
return finalUrl
}
return URL.init(string: "https://www.maps.google.com")!
}
func loadDetailInfo() {
let loader = PlacesLoader()
self.activityIndicator.startAnimating()
self.tableView.isHidden = true
loader.loadDetailInformation(forPlace: self.place) { (dictionary, error) in
guard dictionary != nil else {
DispatchQueue.main.async {
self.activityIndicator.stopAnimating()
self.tableView.isHidden = false
self.tableView.reloadData()
}
return
}
if let resultDictionary = dictionary!["result"] as? NSDictionary {
self.place.address = (resultDictionary["formatted_address"] as? String)!
self.place.phoneNumber = resultDictionary["formatted_phone_number"] as? String
self.place.website = resultDictionary["website"] as? String
if let photosArr = resultDictionary["photos"] as? [NSDictionary] {
for photoDict in photosArr {
let photoReference = photoDict["photo_reference"] as? String
if self.place.photoReferences == nil {
self.place.photoReferences = [String]()
}
self.place.photoReferences?.append(photoReference!)
}
}
}
DispatchQueue.main.async {
self.activityIndicator.stopAnimating()
self.tableView.isHidden = false
self.tableView.reloadData()
}
}
}
}
答案 0 :(得分：-1)
尝试此操作，因为您不强制解开place.website，所以将可选内容添加到了url中，所以它无效并且导航失败，即使if let成功[内部url检查位于UIApplication.shared.open(url内部] < / p>
if let url = URL(string:"\(place.website!)") {
UIApplication.shared.open(url, options: [:], completionHandler: nil)
}
else {
print("no problem")
}