Swift 使用其他后续用户的用户名填充表
我不断得到致命错误: 在展开可选值时意外发现nil 我需要做什么Swift 使用其他后续用户的用户名填充表,swift,parse-platform,Swift,Parse Platform,我不断得到致命错误: 在展开可选值时意外发现nil 我需要做什么 希望找到我搞砸的地方。有很多?在代码中: 第一:您正在尝试使用currentUser(用户名)或(objectID)进行查询吗 第二:在FindObjectsInBackgroundithBlock方法中 首先需要检查是否存在错误,然后将任何对象的数组转换为PFObject class FollowingTableTableViewController: UITableViewController { let usernames
希望找到我搞砸的地方。有很多?在代码中: 第一:您正在尝试使用currentUser(用户名)或(objectID)进行查询吗 第二:在FindObjectsInBackgroundithBlock方法中 首先需要检查是否存在错误,然后将任何对象的数组转换为PFObject
class FollowingTableTableViewController: UITableViewController {
let usernames = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
getUsernames()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
func getUsernames() {
var user1 = PFUser.currentUser()
var findUsernames:PFQuery = PFQuery(className: "FollowRequests")
findUsernames.whereKey("from", equalTo: user1!)
findUsernames.includeKey("to")
findUsernames.findObjectsInBackgroundWithBlock { (objects: [AnyObject]?, error: NSError?) -> Void in
var myObjects = objects as! [PFObject]
//Solve this part. Need to get all of the users from the "to" field in FollowRequests.
//If No error
if (error == nil) {
for myObjects in objects! {
var user2 = PFUser()
user2.objectForKey("to")
self.usernames.addObject(user2.username!)
println(user2.username)
}
self.tableView.reloadData()
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return self.usernames.count
}
override func tableView(tableView: UITableView,
cellForRowAtIndexPath indexPath: NSIndexPath)
-> UITableViewCell {
let item: AnyObject = self.usernames[indexPath.row]
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = (usernames[indexPath.row] as! String)
return cell
}
}
第三:在cellforrowatinexpath方法中
你为什么有那条额外的线
if error == nil{
if let objects = objects as! [PFObject]{
for oneSpecificObject in objects{
var data = oneSpecificObject["to"] as! String
self.usernames.addObject(data)
}
self.tableView.reloadData()
}
//仔细检查您的代码,如果您仍然有问题,请告诉我。有很多问题吗?在代码中: 第一:您正在尝试使用currentUser(用户名)或(objectID)进行查询吗 第二:在FindObjectsInBackgroundithBlock方法中 首先需要检查是否存在错误,然后将任何对象的数组转换为PFObject
class FollowingTableTableViewController: UITableViewController {
let usernames = NSMutableArray()
override func viewDidLoad() {
super.viewDidLoad()
getUsernames()
// Uncomment the following line to preserve selection between presentations
// self.clearsSelectionOnViewWillAppear = false
// Uncomment the following line to display an Edit button in the navigation bar for this view controller.
// self.navigationItem.rightBarButtonItem = self.editButtonItem()
}
func getUsernames() {
var user1 = PFUser.currentUser()
var findUsernames:PFQuery = PFQuery(className: "FollowRequests")
findUsernames.whereKey("from", equalTo: user1!)
findUsernames.includeKey("to")
findUsernames.findObjectsInBackgroundWithBlock { (objects: [AnyObject]?, error: NSError?) -> Void in
var myObjects = objects as! [PFObject]
//Solve this part. Need to get all of the users from the "to" field in FollowRequests.
//If No error
if (error == nil) {
for myObjects in objects! {
var user2 = PFUser()
user2.objectForKey("to")
self.usernames.addObject(user2.username!)
println(user2.username)
}
self.tableView.reloadData()
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
// #warning Incomplete method implementation.
// Return the number of rows in the section.
return self.usernames.count
}
override func tableView(tableView: UITableView,
cellForRowAtIndexPath indexPath: NSIndexPath)
-> UITableViewCell {
let item: AnyObject = self.usernames[indexPath.row]
let cell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! UITableViewCell
cell.textLabel!.text = (usernames[indexPath.row] as! String)
return cell
}
}
第三:在cellforrowatinexpath方法中
你为什么有那条额外的线
if error == nil{
if let objects = objects as! [PFObject]{
for oneSpecificObject in objects{
var data = oneSpecificObject["to"] as! String
self.usernames.addObject(data)
}
self.tableView.reloadData()
}
//仔细检查您的代码,如果仍然有问题,请告诉我。请尝试使用当前用户名或IDXcode查找查询,通常Xcode会突出显示导致错误的行,你也可以分享吗?查询按用户名进行确定你看到我的建议了吗?你现在正在查看它。如果你尝试使用当前用户名或IDXcode查找查询,通常会突出显示导致错误的行,你也可以分享吗?查询按用户名进行确定你看到我的建议了吗。