import UIKit
class FeedTableViewController: UITableViewController {
var navBar:UINavigationBar=UINavigationBar()
let font = UIFont(name: "Baskerville", size: 15)
var feedData:NSMutableArray = NSMutableArray()
required init(coder aDecoder: NSCoder){
super.init(coder: aDecoder)
}
@IBAction func likeButton(sender: AnyObject) {
if var votes:Int? = quote!.objectForKey("votes") as? Int {
votes!++
}
}
@IBAction func loadData(sender: AnyObject?) {
feedData.removeAllObjects()
var findFeedData:PFQuery = PFQuery(className: "userQuotes")
findFeedData.findObjectsInBackgroundWithBlock{
(objects:[AnyObject]?, error:NSError?)->Void in
if error == nil{
if let objs = objects{
for object in objs{
let quote:PFObject = object as! PFObject
self.feedData.addObject(quote)
// let user:PFUser = (object as! NSArray).lastObject as! PFUser
}
//println(self.feedData)
let array:NSArray = self.feedData.reverseObjectEnumerator().allObjects
self.feedData = NSMutableArray(array: array)
NSOperationQueue.mainQueue().addOperationWithBlock({
self.tableView.reloadData()
})
}
}
}
}
override func viewDidAppear(animated: Bool) {
self.loadData( nil )
}
override func viewDidLoad() {
super.viewDidLoad()
self.title = "Quotezilla"
// 3
//self.navigationItem.setRightBarButtonItem(rightSearchBarButtonItem, animated: true)
// 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()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
// 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 feedData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell:QuoteTableViewCell = tableView.dequeueReusableCellWithIdentifier("cell", forIndexPath: indexPath) as! QuoteTableViewCell
let quote:PFObject = self.feedData.objectAtIndex(indexPath.row) as! PFObject
cell.contentTextView!.font = font
cell.timeStampLabel!.font = font
cell.publisherLabel!.font = font
cell.contentTextView.alpha = 0
cell.timeStampLabel.alpha = 0
cell.publisherLabel.alpha = 0
cell.contentTextView.text = quote.objectForKey("content") as! String
//cell.publisherLabel.text = quote.objectForKey("publisher") as? String
/* func loadLikes(){
if var votes:Int? = quote.objectForKey("votes") as? Int {
votes!++
}
}*/
var dateFormatter:NSDateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "EEEE, MMM d, h:mm a"
cell.timeStampLabel.text = dateFormatter.stringFromDate(quote.createdAt!)
var votes:Int? = quote["votes"] as? Int
if votes == nil {
votes = 0
}
cell.likesLabel?.text = "\(votes!)"
var myObject = quote["publisher"] as? PFObject
myObject?.fetchIfNeeded()
if let foundUser = myObject as? PFUser{
cell.publisherLabel.text = foundUser.username
UIView.animateWithDuration(0.7, animations: {
cell.contentTextView.alpha = 1
cell.timeStampLabel.alpha = 1
cell.publisherLabel.alpha = 1
})
}
return cell
}
所以我基本上尝试做的是创建一个喜欢或投票按钮。正如你在代码中看到的那样，我有一个likeButton动作，应该在parse中自动增加likes部分。我在cellForRowAtIndexPath函数中显示我已经填充到Parse本身的行中的当前喜欢。问题是我不能调用quote.objectForKey("votes")，因为我稍后会初始化它。我一直在研究这个问题，并且找不到通过likeButton动作解析投票的方法。
你必须与网络生活在一起。这意味着当应用程序启动时，您的表将无法获得某些数据。正常处理特定单元格中缺少的对象或缺少键，只需使用某种占位符值。执行解析回调时，您已经正确强制刷新。
好的，所以大编辑
这堂课需要做很多工作。我甚至不会在这里详细说明每一个变化，但它基本上是一个完整的Parse.com教程。
这段代码编译得很干净，但我不能确定你的上下文中的所有内容。特别是在每个表行上都有'likesButton'作为自定义表格单元格视图的一部分吗？我在假设。
class FeedTableViewController: UITableViewController {
var navBar = UINavigationBar()
let font = UIFont(name: "Baskerville", size: 15)
var feedData = [PFObject]()
static let cellID = "cell"
// NOTE! See how this tag is set below
@IBAction func likeButton(sender: UIButton) {
let quote = feedData[sender.tag]
if let votes = quote.objectForKey("votes") as? Int {
quote.setObject(votes + 1, forKey: "votes")
}
else {
// CHALLENGE FOR YOU: handle the case of no votes attribute
}
// UPDATE the local UI
tableView.reloadRowsAtIndexPaths([NSIndexPath(forRow: sender.tag, inSection: 0)],
withRowAnimation: .None)
// CHALLENGE FOR YOU: UPDATE Parse...start a new question if necessary
}
@IBAction func loadData(sender: AnyObject?) {
feedData.removeAll()
PFQuery(className: "userQuotes").findObjectsInBackgroundWithBlock {
[unowned self]
(objects: [AnyObject]?, error: NSError?) -> Void in
if let objs = objects {
for object in objs {
self.feedData.append(object as! PFObject)
}
self.feedData = self.feedData.reverse()
}
NSOperationQueue.mainQueue().addOperationWithBlock { self.tableView.reloadData() }
}
}
override func viewDidLoad() {
super.viewDidLoad()
self.loadData(nil)
self.title = "Quotezilla"
}
// MARK: - Table view data source
override func numberOfSectionsInTableView(tableView: UITableView) -> Int {
return 1
}
override func tableView(tableView: UITableView, numberOfRowsInSection section: Int) -> Int {
return feedData.count
}
override func tableView(tableView: UITableView, cellForRowAtIndexPath indexPath: NSIndexPath) -> UITableViewCell {
let cell = tableView.dequeueReusableCellWithIdentifier(FeedTableViewController.cellID, forIndexPath: indexPath) as! QuoteTableViewCell
cell.likesButton!.tag = indexPath.row // See how tag works with the above
cell.contentTextView!.font = font
cell.timeStampLabel!.font = font
cell.publisherLabel!.font = font
cell.contentTextView.alpha = 0.0
cell.timeStampLabel.alpha = 0.0
cell.publisherLabel.alpha = 0.0
let q = feedData[indexPath.row]
if let content = q.objectForKey("content") as? String {
cell.contentTextView.text = content
}
else {
cell.contentTextView.text = "Content not found!"
}
var dateFormatter = NSDateFormatter()
dateFormatter.dateFormat = "EEEE, MMM d, h:mm a"
cell.timeStampLabel.text = dateFormatter.stringFromDate(q.createdAt!)
let votes = (q.objectForKey("votes") as? Int) ?? 0
cell.likesLabel?.text = "\(votes)"
let myObject = q.objectForKey("publisher") as? PFObject
myObject?.fetchInBackgroundWithBlock {
[unowned self]
(object: PFObject?, error: NSError?) in
NSOperationQueue.mainQueue().addOperationWithBlock {
if let foundUser = object as? PFUser {
cell.publisherLabel.text = foundUser.username
UIView.animateWithDuration(0.7) {
cell.contentTextView.alpha = 1.0
cell.timeStampLabel.alpha = 1.0
cell.publisherLabel.alpha = 1.0
}
}
else {
cell.publisherLabel.text = "Publisher not found!"
}
}
}
return cell
}
}