我已经从2周开始研究它，我喜欢Instagram，用户可以使用Parse后端登录和登录。现在注册后，为下一个名为userListTableViewController的屏幕制作了一个segue，用户将被允许关注已经存在的用户。现在我尝试在NSMutableArray中检索数据并按如下方式显示：
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 = // What should i use here?? *****************
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")
}
})
}
}
})
}
}
}
将代码中的问题显示为注释..或者你可以请一些比这更好的方式给我建议..我也尝试在数组中检索数据，还有我遇到的问题“ 纽扣。您可以在此处查看问题.. Not able to reload data properly when retrieving objects from Parse ..请检查此链接..
请帮帮我..谢谢..
编辑：我只想制作具有性别全名和个人资料图片的用户列表，并希望允许用户使用每个单元格上的“关注”按钮关注它们。如果应用程序重新启动，则用户如果当前用户需要，则必须将当前用户标记为“取消关注”以取消关注用户..
检查代码中的注释..错误在那里你看到“***************”它在cellForRowAtIndexPath
答案 0 :(得分：0)
不要使用PFUser，数组和字典，而是在应用程序端创建一个类User。
class User: NSObject {
var pfUser : PFObject?
var isFollowing : Bool = false
}
在loadData方法中，
func loadData() {
// **************** Your Codes ********************
if user.objectId != PFUser.currentUser()?.objectId {
var otherUser = User()
otherUser.pfUser = user
// **************** Your Codes ********************
followerQuery.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
if objects.count > 0 {
otherUser.isFollowing = true
}
}
})
self.data.addObject(otherUser)
}
}
然后使用单个mutableArray data填充tableView。