正如标题所说,我试图在点击单元格时显示详细信息 View 。我的问题是我正在使用的 prepareForSegue 函数。我没有得到任何错误,但是当我在模拟器上运行时,我得到了一个未捕获的异常。它出现在 prepareForSegue 函数的最后一行。它发现名称为 nil,我不确定为什么变量为 nil。任何帮助将不胜感激。
更新: Uncaught Error 不再是问题。现在点击单元格时不会显示数据。
class LocalPostsTableViewController: UITableViewController, UINavigationBarDelegate {
var currentIndexPath: NSIndexPath?
func displayAlert(title: String, message: String) {
var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "Ok", style: .Default, handler: { (action) -> Void in
}))
self.presentViewController(alert, animated: true, completion: nil)
}
var names = [String]()
var locations = [String]()
var dates = [String]()
var imageFiles = [PFFile]()
var abouts = [String]()
override func viewDidLoad() {
super.viewDidLoad()
PFGeoPoint.geoPointForCurrentLocationInBackground { (geoPoint, error) -> Void in
if let geoPoint = geoPoint {
PFUser.currentUser()?["location"] = geoPoint
PFUser.currentUser()?.saveInBackground()
var getLocalPostsQuery = PFQuery(className: "publicPosts")
if let latitude = PFUser.currentUser()!["location"].latitude {
if let longitude = PFUser.currentUser()!["location"].longitude {
getLocalPostsQuery.whereKey("searchLocation", withinGeoBoxFromSouthwest: PFGeoPoint(latitude: latitude - 0.5, longitude: longitude - 0.5), toNortheast: PFGeoPoint(latitude: latitude + 0.5, longitude: longitude + 0.5))
getLocalPostsQuery.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if let objects = objects {
self.names.removeAll(keepCapacity: true)
self.locations.removeAll(keepCapacity: true)
self.abouts.removeAll(keepCapacity: true)
self.dates.removeAll(keepCapacity: true)
self.imageFiles.removeAll(keepCapacity: true)
for object in objects {
self.names.append(object["name"] as! String)
self.locations.append(object["location"] as! String)
self.dates.append(object["date"] as! String)
self.abouts.append(object["about"] as! String)
self.imageFiles.append(object["imageFile"] as! PFFile)
self.tableView.reloadData()
}
}
}
}
}
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(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 names.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let LECell = tableView.dequeueReusableCellWithIdentifier("LocalPostsCell", forIndexPath: indexPath) as! LocalPostsTableViewCell
imageFiles[indexPath.row].getDataInBackgroundWithBlock { (data, error) -> Void in
if let downloadedImage = UIImage(data: data!) {
LECell.postImage.image = downloadedImage
}
}
LECell.postName.text = names[indexPath.row]
LECell.postLocation.text = locations[indexPath.row]
LECell.postDate.text = dates[indexPath.row]
return LECell
}
let localPostsDetailSegue = "showLocalPostsDetailView"
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == localPostsDetailSegue {
let detailScene = segue.destinationViewController as! LocalPostsDetailViewController
if let indexPath = self.tableView.indexPathForSelectedRow {
let row = Int(indexPath.row)
detailScene.postName?.text = names[row]
}
}
}
}
最佳答案
您应该将字符串传递给下一个 Controller ,并将此文本设置为下一个屏幕的 viewDidLoad
中的标签。
定义:
var postName: String!
在LocalPostsDetailViewController
并且在prepareForSegue
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if segue.identifier == localPostsDetailSegue {
let detailScene = segue.destinationViewController as! LocalPostsDetailViewController
if let indexPath = self.tableView.indexPathForSelectedRow {
let row = Int(indexPath.row)
detailScene.postName = names[row]
}
}
在LocalPostsDetailViewController
的viewDidLoad
中设置它:
self.postName?.text = postName
关于ios - 单元格点击时显示详细 View Swift Parse,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/34190651/