使用Swift(带有故事板)和Parse在社交iPhone应用程序上工作,用户可以创建帖子并评论类似于Facebook iOS应用程序和其他社交网络应用程序的帖子。
该应用有一个初始的主主页Feed (显示用户帖子)和详细回复页(应该显示已选择但对不同帖子显示相同回复的特定帖子的评论。两者都使用PFTableViewController类,并且每个都有自己的PFTableViewCell在单独的swift文件中实现作为原型单元格。
当用户点击“主页Feed”页面中的任何帖子单元格时,它会导航到“回复”页面,但会显示该帖子的所有现有评论(以及每个新评论)。当用户从“主页Feed”页面选择特定帖子时,我只想显示特定帖子的评论。
知道为什么会这样吗?非常感谢您的时间和帮助!
首页Feed页面:
class HomeTableVC: PFQueryTableViewController,CLLocationManagerDelegate {
var posts: NSMutableArray! = NSMutableArray()
override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
return posts.count
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, didSelectRowAtIndexPath indexPath: NSIndexPath) {
self.performSegueWithIdentifier("showReplyViewController", sender: self)
}
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?, object: PFObject!) -> PFTableViewCell? {
let cell = tableView!.dequeueReusableCellWithIdentifier("PostCell", forIndexPath: indexPath!) as! PostTableCell
if let userPost : PFObject = self.posts.objectAtIndex(indexPath!.row) as! PFObject {
cell.name.text = object["userName"] as? String
cell.message.text = object["postMessage"] as? String
let dateUpdated = object.createdAt! as NSDate
let dateFormat = NSDateFormatter()
dateFormat.dateFormat = "h:mm a"
cell.dateTime.text = NSString(format: "%@", dateFormat.stringFromDate(dateUpdated)) as String
cell.message.numberOfLines = 0
cell.message.text = userPost.objectForKey("postMessage") as? String
}
return cell
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if (segue.identifier == "showReplyViewController") {
let indexPath = self.tableView.indexPathForSelectedRow
let postObject = self.objects![indexPath!.row] as! PFObject
//postObject (on LHS) is the PFObject declared in ResponseViewController
if let destinationVC = segue.destinationViewController as? ReplyTableViewController {
destinationVC.postObject = postObject
}
}
}
}
回复页面:
class ReplyTableViewController: PFQueryTableViewController {
var postObject: PFObject?
var replies: NSMutableArray! = NSMutableArray()
override func viewDidAppear(animated: Bool) {
super.viewDidAppear(animated)
replies = NSMutableArray()
var replyQuery = PFQuery(className: "Reply")
replyQuery.addAscendingOrder("createdAt")
replyQuery.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
for object in objects! {
let reply: PFObject = object as! PFObject
self.replies.addObject(reply)
}
let repliesArray: NSArray = self.replies.reverseObjectEnumerator().allObjects
self.replies = NSMutableArray(array: repliesArray)
self.tableView.reloadData()
}
}
}
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView?, numberOfRowsInSection section: Int) -> Int {
return replies.count
}
override func tableView(tableView: UITableView?, cellForRowAtIndexPath indexPath: NSIndexPath?, object: PFObject!) -> PFTableViewCell? {
let cell = tableView!.dequeueReusableCellWithIdentifier("replyCell", forIndexPath: indexPath!) as! ReplyTableViewCell
let replyObject: PFObject = self.replies.objectAtIndex(indexPath!.row) as! PFObject
cell.replyMessageLabel.text = replyObject.objectForKey("replyMessage") as? String
var queryUser: PFQuery = PFUser.query()!
queryUser.whereKey("objectId", equalTo: (replyObject.objectForKey("replyUser")?.objectId)!)
queryUser.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
let user: PFUser = (objects! as NSArray).lastObject as! PFUser
cell.replyAuthorLabel.text = user.username
}
}
return cell
}
}
答案 0 :(得分:0)
在您的segue中,您需要告诉目标ViewController哪个帖子显示回复。
将其添加到您的segue底部(确切位置为您的评论):
if let destinationVC = segue.destinationViewController as? ReplyTableViewController{
destinationVC.postObject = postObject
}
在ReplyTableViewController
中,您需要一个postObject
变量,以便segue中的代码可以正常工作。位于ReplyTableViewController
放置的顶部:
var postObject = PFObject()
看起来postObject
应该在PFQuery()
的某处使用来过滤回复,但我不熟悉它。