我将如何制作一个喜欢的按钮？
How would I make a like button?
我正在使用 Swift 中的练习教程制作社交媒体应用程序克隆，但我想使用 Parse 添加一个赞按钮，但不确定如何添加。有谁知道教程，或者您知道如何去做吗？我试图做一个这样的，但我很确定它不正确......
我把它放在单元格视图控制器中
@IBAction func likeButton(sender: AnyObject) {
a++
var post = PFObject(className: "Post")
post["likes"] = a
}
}
这进入了提要视图控制器...
var messages = [String]()
var usernames = [String]()
var imageFiles = [PFFile]()
var users = [String: String]()
var likesArray = [String]()
override func viewDidLoad() {
super.viewDidLoad()
var query = PFUser.query()
query?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let users = objects {
self.messages.removeAll(keepCapacity: true)
self.users.removeAll(keepCapacity: true)
self.imageFiles.removeAll(keepCapacity: true)
self.usernames.removeAll(keepCapacity: true)
self.likesArray.removeAll(keepCapacity: true)
for object in users {
if let user = object as? PFUser {
self.users[user.objectId!] = user.username!
}
}
}
})
var getFollowedUsersQuery = PFQuery(className: "followers")
getFollowedUsersQuery.whereKey("follower", equalTo: PFUser.currentUser()!.objectId!)
getFollowedUsersQuery.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if let objects = objects {
for object in objects {
var followedUser = object["following"] as! String
var query = PFQuery(className: "Post")
query.whereKey("userId", equalTo: followedUser)
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
for object in objects {
self.messages.append(object["message"] as! String)
self.imageFiles.append(object["imageFile"] as! PFFile)
self.usernames.append(self.users[object["userId"] as! String]!)
self.likesArray.append(object["likes"] as? String)
self.tableView.reloadData()
}
}
})
}
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
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 usernames.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let myCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! cell
imageFiles[indexPath.row].getDataInBackgroundWithBlock { (data, error) -> Void in
if let downloadedImage = UIImage(data: data!) {
myCell.postedImage.image = downloadedImage
}
}
myCell.username.text = usernames[indexPath.row]
myCell.message.text = messages[indexPath.row]
myCell.likeLabel.text = likesArray[indexPath.row]
myCell.selectionStyle = .None
return myCell
}
}
当您 post 图片和消息时，这是视图控制器...
var likes = 0
var picSelected = false
@IBOutlet var feed: UIButton!
func displayAlert(title: String, message: String) {
var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { (action) -> Void in
}))
presentViewController(alert, animated: true, completion: nil)
}
var activityIndicator = UIActivityIndicatorView()
@IBOutlet var imageToPost: UIImageView!
@IBAction func chooseImage(sender: AnyObject) {
var image = UIImagePickerController()
image.delegate = self
image.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
image.allowsEditing = false
presentViewController(image, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
dismissViewControllerAnimated(true, completion: nil)
imageToPost.image = image
picSelected = true
}
@IBOutlet var message: UITextField!
@IBAction func postImage(sender: AnyObject) {
if message.text != "" && picSelected != false {
picSelected = false
activityIndicator = UIActivityIndicatorView(frame: view.frame)
activityIndicator.backgroundColor = UIColor(white: 1.0, alpha: 0.5)
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
view.addSubview(activityIndicator)
activityIndicator.startAnimating()
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
var post = PFObject(className: "Post")
post["message"] = message.text
post["userId"] = PFUser.currentUser()?.objectId!
let imageData = UIImagePNGRepresentation(imageToPost.image)
let imageFile = PFFile(name: "image.png", data: imageData)
post["imageFile"] = imageFile
post["likes"] = a
post.saveInBackgroundWithBlock { (success, error) -> Void in
self.activityIndicator.stopAnimating()
UIApplication.sharedApplication().endIgnoringInteractionEvents()
if error == nil {
self.displayAlert("Image Posted!", message: "Your image has been posted successfully.")
self.imageToPost.image = UIImage(named: "Blank-Person1.png")
self.message.text = ""
}
}
} else {
displayAlert("Could Not Post Image!", message: "Please enter a message and/or select a picture.")
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
我要制作这样的“赞”按钮：
- 在解析中创建姓名列（数组列）以保存点击赞按钮的姓名
- 在解析中创建 Likes 列（整数列）以保存 Names 列的计数
当有人点击赞按钮时，将他的名字添加到解析中的名称数组中，如果他再次点击它，则删除他的名字
并且您需要获取 NamesArray 列中的所有名称并在 swift 中对它们进行计数，然后更新 likes 列
我不确定，但我现在就是这么想的，但如果你想到它，你会找到更好的方法。
我正在使用 Swift 中的练习教程制作社交媒体应用程序克隆，但我想使用 Parse 添加一个赞按钮，但不确定如何添加。有谁知道教程，或者您知道如何去做吗？我试图做一个这样的，但我很确定它不正确......
我把它放在单元格视图控制器中
@IBAction func likeButton(sender: AnyObject) {
a++
var post = PFObject(className: "Post")
post["likes"] = a
}
}
这进入了提要视图控制器...
var messages = [String]()
var usernames = [String]()
var imageFiles = [PFFile]()
var users = [String: String]()
var likesArray = [String]()
override func viewDidLoad() {
super.viewDidLoad()
var query = PFUser.query()
query?.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let users = objects {
self.messages.removeAll(keepCapacity: true)
self.users.removeAll(keepCapacity: true)
self.imageFiles.removeAll(keepCapacity: true)
self.usernames.removeAll(keepCapacity: true)
self.likesArray.removeAll(keepCapacity: true)
for object in users {
if let user = object as? PFUser {
self.users[user.objectId!] = user.username!
}
}
}
})
var getFollowedUsersQuery = PFQuery(className: "followers")
getFollowedUsersQuery.whereKey("follower", equalTo: PFUser.currentUser()!.objectId!)
getFollowedUsersQuery.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
if let objects = objects {
for object in objects {
var followedUser = object["following"] as! String
var query = PFQuery(className: "Post")
query.whereKey("userId", equalTo: followedUser)
query.findObjectsInBackgroundWithBlock({ (objects, error) -> Void in
if let objects = objects {
for object in objects {
self.messages.append(object["message"] as! String)
self.imageFiles.append(object["imageFile"] as! PFFile)
self.usernames.append(self.users[object["userId"] as! String]!)
self.likesArray.append(object["likes"] as? String)
self.tableView.reloadData()
}
}
})
}
}
}
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
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 usernames.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let myCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! cell
imageFiles[indexPath.row].getDataInBackgroundWithBlock { (data, error) -> Void in
if let downloadedImage = UIImage(data: data!) {
myCell.postedImage.image = downloadedImage
}
}
myCell.username.text = usernames[indexPath.row]
myCell.message.text = messages[indexPath.row]
myCell.likeLabel.text = likesArray[indexPath.row]
myCell.selectionStyle = .None
return myCell
}
}
当您 post 图片和消息时，这是视图控制器...
var likes = 0
var picSelected = false
@IBOutlet var feed: UIButton!
func displayAlert(title: String, message: String) {
var alert = UIAlertController(title: title, message: message, preferredStyle: UIAlertControllerStyle.Alert)
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler: { (action) -> Void in
}))
presentViewController(alert, animated: true, completion: nil)
}
var activityIndicator = UIActivityIndicatorView()
@IBOutlet var imageToPost: UIImageView!
@IBAction func chooseImage(sender: AnyObject) {
var image = UIImagePickerController()
image.delegate = self
image.sourceType = UIImagePickerControllerSourceType.PhotoLibrary
image.allowsEditing = false
presentViewController(image, animated: true, completion: nil)
}
func imagePickerController(picker: UIImagePickerController, didFinishPickingImage image: UIImage!, editingInfo: [NSObject : AnyObject]!) {
dismissViewControllerAnimated(true, completion: nil)
imageToPost.image = image
picSelected = true
}
@IBOutlet var message: UITextField!
@IBAction func postImage(sender: AnyObject) {
if message.text != "" && picSelected != false {
picSelected = false
activityIndicator = UIActivityIndicatorView(frame: view.frame)
activityIndicator.backgroundColor = UIColor(white: 1.0, alpha: 0.5)
activityIndicator.center = self.view.center
activityIndicator.hidesWhenStopped = true
activityIndicator.activityIndicatorViewStyle = UIActivityIndicatorViewStyle.Gray
view.addSubview(activityIndicator)
activityIndicator.startAnimating()
UIApplication.sharedApplication().beginIgnoringInteractionEvents()
var post = PFObject(className: "Post")
post["message"] = message.text
post["userId"] = PFUser.currentUser()?.objectId!
let imageData = UIImagePNGRepresentation(imageToPost.image)
let imageFile = PFFile(name: "image.png", data: imageData)
post["imageFile"] = imageFile
post["likes"] = a
post.saveInBackgroundWithBlock { (success, error) -> Void in
self.activityIndicator.stopAnimating()
UIApplication.sharedApplication().endIgnoringInteractionEvents()
if error == nil {
self.displayAlert("Image Posted!", message: "Your image has been posted successfully.")
self.imageToPost.image = UIImage(named: "Blank-Person1.png")
self.message.text = ""
}
}
} else {
displayAlert("Could Not Post Image!", message: "Please enter a message and/or select a picture.")
}
}
override func viewDidLoad() {
super.viewDidLoad()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
/*
// MARK: - Navigation
// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
// Get the new view controller using segue.destinationViewController.
// Pass the selected object to the new view controller.
}
*/
}
我要制作这样的“赞”按钮：
- 在解析中创建姓名列（数组列）以保存点击赞按钮的姓名
- 在解析中创建 Likes 列（整数列）以保存 Names 列的计数
当有人点击赞按钮时，将他的名字添加到解析中的名称数组中，如果他再次点击它，则删除他的名字
并且您需要获取 NamesArray 列中的所有名称并在 swift 中对它们进行计数，然后更新 likes 列
我不确定，但我现在就是这么想的，但如果你想到它，你会找到更好的方法。