我正在构建一个投票/ Instagram类型的应用程序,用户可以选择非用户制作的照片,该照片会被推送到时间轴中。
我已经建立了选择屏幕和按钮,以及时间轴。出于某种原因,我只能猜测它与保存PFObject(选择的照片)的年表有关,时间轴显示在当前所选照片之前选择的照片。
以下块是'SelectScreenVC'上的'选择'按钮:
@IBAction func selectNext(sender: UIButton) {
let imageData = UIImagePNGRepresentation(lgImgURL.image)
let imageFile = PFFile(name: "\(cName.text!)", data: imageData)
var user = PFUser.currentUser()
user["nextChosen"] = "\(cName.text!)"
user["imageFile"] = imageFile
var userNextPhoto = PFObject(className: "UserNextPhoto")
userNextPhoto["username"] = PFUser.currentUser().username
userNextPhoto["cName"] = "\(cName.text!)" as String
userNextPhoto["imageFile"] = imageFile
userNextPhoto.saveInBackgroundWithBlock { (success: Bool!, error: NSError!) -> Void in
if error == nil {
println("User \(PFUser.currentUser().username) chose: \(self.cName.text!)")
} else {
println(error)
}
}
self.navigationController?.popToViewController(timeLineVC, animated: true)
}
这是TimeLineVC。我有创建时间轴数组的函数,我跳过了一些TableView方法,除了cellForRowAtIndexPath。
class TimeLineViewController: UITableViewController {
var timelineData:NSMutableArray = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
loadData()
}
func loadData() {
timelineData.removeAllObjects()
var findTimelineData:PFQuery = PFQuery(className: "UserNextPhoto")
findTimelineData.findObjectsInBackgroundWithBlock { (objects: [AnyObject]!, error: NSError!) -> Void in
if error == nil {
for object in objects {
self.timelineData.addObject(object)
}
} else {
NSLog("Error: %@ %@", error, error.userInfo!)
}
let array: NSArray = self.timelineData.reverseObjectEnumerator().allObjects
self.timelineData = NSMutableArray(array: array)
self.tableView.reloadData()
}
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier("timelineCell", forIndexPath: indexPath) as TimelineTableViewCell
let userNextPhoto:PFObject = self.timelineData.objectAtIndex(indexPath.row) as PFObject
let nextPhoto:PFObject = self.timelineData.objectAtIndex(indexPath.row) as PFObject
cell.usernameLabel.text = PFUser.currentUser().username
cell.cName.text = (userNextPhoto["cName"] as String)
return cell
}
我感谢任何帮助或见解!
答案 0 :(得分:2)
正是这样:弹出视图控制器时,新照片尚未完成上传。您可以等待照片完成上传(这不是一个很好的用户体验),或者您可以将对新保存的对象的引用传回给弹出的视图控制器,然后可以立即显示新照片而无需等待上传完成。