问题
I've been working on it from 2 weeks now, I've Instagram like app, where user can signUp and Login using Parse backend. Now after signUp a segue is made for the next screen called "userListTableViewController" here users will be allowed to follow the already existing users. Now i trying to retrieve data in NSMutableArray and show them as follows:
import UIKit
class userListTableViewController: UITableViewController {
var data:NSMutableArray = NSMutableArray()
var isFollowing = [PFObject:Bool]()
func loadData() {
data.removeAllObjects()
isFollowing.removeAll(keepCapacity: true)
var userQuery = PFUser.query()
userQuery?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if error != nil {
} else {
if let objects = objects {
for object in objects {
if let user = object as? PFObject {
if user.objectId != PFUser.currentUser()?.objectId {
self.data.addObject(user)
var followerQuery: PFQuery = PFQuery(className: "Followers")
followerQuery.whereKey("follower", equalTo: PFUser.currentUser()!)
followerQuery.whereKey("user", equalTo: user)
followerQuery.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
if objects.count > 0 {
self.isFollowing[user] = true
} else {
self.isFollowing[user] = false
}
}
if self.isFollowing.count == self.data.count {
self.tableView.reloadData()
}
})
}
}
}
}
}
})
}
override func viewDidLoad() {
super.viewDidLoad()
loadData()
}
/*
var array:NSMutableArray = NSMutableArray(array: self.data.reverseObjectEnumerator().allObjects)
self.data = array as NSMutableArray
self.tableView.reloadData()
*/
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
// #warning Potentially incomplete method implementation.
// Return the number of sections.
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return data.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let myCell = tableView.dequeueReusableCellWithIdentifier("users", forIndexPath: indexPath) as! userListTableViewCell
let userData:PFObject = self.data.objectAtIndex(indexPath.row) as! PFObject
myCell.fullName.text = userData["objectId"] as! String!
myCell.genderLabel.text = userData["gender"] as! String!
// var array:NSMutableArray = NSMutableArray(array: self.data.reverseObjectEnumerator().allObjects)
// self.data = array as NSMutableArray
let followedId = userIds[indexPath.row]
if isFollowing[followedId] == true { // ERROR!! not able to use followedId here.. how should i give a value so that it will check the particular user's objectId and isFollowing Bool value.
myCell.followButtton.setTitle("unfollow", forState: UIControlState.Normal)
} else {
myCell.followButtton.setTitle("follow", forState: UIControlState.Normal)
}
userData["profilePicture"]?.getDataInBackgroundWithBlock({ (data, error) -> Void in
if let downloadeImage = UIImage(data: data!) {
myCell.dp.image = downloadeImage
}
myCell.followButtton.tag = indexPath.row
myCell.followButtton.addTarget(self, action: "followButtonTapped:", forControlEvents: UIControlEvents.TouchUpInside)
})
return myCell
}
// IBActions..
func followButtonTapped(sender: UIButton){
let userData:PFObject = self.data.objectAtIndex(sender.tag) as! PFObject
let followedId = userData["objectId"] as! PFObject
if isFollowing[followedId] == false {
isFollowing[followedId] = true
sender.setTitle("unfollow", forState: UIControlState.Normal)
let getObjectByIdQuery = PFUser.query()
getObjectByIdQuery?.whereKey("objectId", equalTo: userData.objectId!)
getObjectByIdQuery?.getFirstObjectInBackgroundWithBlock({ (foundObject:PFObject?, error:NSError?) -> Void in
if let object = foundObject {
var followers:PFObject = PFObject(className: "Followers")
followers["user"] = object
followers["follower"] = PFUser.currentUser()
followers.saveInBackgroundWithBlock({ (success, error) -> Void in
if error != nil {
println(error)
} else {
println("saved")
}
})
}
})
} else {
isFollowing[followedId] = false
sender.setTitle("follow", forState: UIControlState.Normal)
var query:PFQuery = PFQuery(className: "Followers")
query.whereKey("follower", equalTo: PFUser.currentUser()!)
query.whereKey("user", equalTo: data[sender.tag])
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
for object in objects {
object.deleteInBackgroundWithBlock({ (success, error) -> Void in
if error != nil {
println(error)
} else {
println("deleted")
}
})
}
}
})
}
}
}
shown the problem in the code as comment.. or else canyou please suggest me some other way better than this.. i ve tried to retrieve data in arrays also, there also i'm getting problem for the "follow" buttons. You can see the problem here..Not able to reload data properly when retrieving objects from Parse
Please help me out here.. Thanks..
Edit: I just want to make the user list with there gender full name and profile picture, and want to allow user to follow them with a button "follow" on each cell.. and if the app restarts, the users which have been already followed by the current user must be marked as "unfollow" to unfollow the user if current user wants it..
来源：https://stackoverflow.com/questions/31836201/user-list-to-follow-using-parse-and-swift