因此，我创建了一个用户可以上传图像和文本的应用程序。这些帖子将显示在UICollectionView中。我将在下面提供一些代码供您查看。
所以我的PostsViewController看起来像这样：
import UIKit
import Parse
import Bolts
import ActiveLabel
extension UILabel {
func setSizeFont (sizeFont: CGFloat) {
self.font = UIFont(name: self.font.fontName, size: sizeFont)!
self.sizeToFit()
}
}
extension NSDate {
var timeAgo: String {
let minute = 60
let hour = 60 * minute
let day = 24 * hour
let secondsAgo = Int(NSDate().timeIntervalSinceDate(self))
if secondsAgo < 0 { return "later" }
if secondsAgo == 0 { return "now" }
if secondsAgo == 1 { return "1 second ago" }
if secondsAgo < minute { return "\(secondsAgo) seconds ago" }
if secondsAgo < (2 * minute) { return "1 minute ago" }
if secondsAgo < hour { return "\(secondsAgo/minute) minutes ago" }
if secondsAgo < 2 * hour { return "1 hour ago" }
if secondsAgo < day { return "\(secondsAgo / hour) hours ago" }
let formatter = NSDateFormatter()
formatter.dateFormat = "M/d/yy"
return formatter.stringFromDate(self)
}
}
extension UIImage {
func makeImageWithColorAndSize(color: UIColor, size: CGSize) -> UIImage {
UIGraphicsBeginImageContextWithOptions(size, false, 0)
color.setFill()
UIRectFill(CGRectMake(0, 0, size.width, size.height))
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image
}
}
struct Details {
var username:String!
var text:String!
var CreatedAt:NSDate!
var image:String!
var objID:String!
var likedBy:NSArray
var comments:NSArray
init(username:String,text:String,CreatedAt:NSDate,image:String,objID:String,likedBy:NSArray,comments:NSArray){
self.username = username
self.text = text
self.CreatedAt = CreatedAt
self.image = image
self.objID = objID
self.likedBy = likedBy
self.comments = comments
}
}
class HomeViewController: UIViewController, UICollectionViewDelegate, PlayerDelegate {
@IBOutlet var collectionView: UICollectionView!
var arrayOfDetails = [Details]()
var likedPhotos = String()
let Like = UIImage(named: "Like.png")
let LikeDone = UIImage(named: "LikeDone.png")
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
self.collectionView.delegate = self
queryCurrentUploads()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
func queryCurrentUploads() {
self.arrayOfDetails.removeAll()
let query = PFQuery(className: "currentUploads")
query.orderByDescending("createdAt")
query.findObjectsInBackgroundWithBlock { (objects:[PFObject]?, error: NSError?) -> Void in
if error == nil
{
if let newObjects = objects {
for oneobject in newObjects {
let text = oneobject["imageText"] as! String
let username = oneobject["username"] as! String
let objID = oneobject.objectId!
let time = oneobject.createdAt!
let likedBy = oneobject["likedBy"] as! NSArray
let comments = oneobject["comments"] as! NSArray
if let userImage = oneobject["imageFile"] as? PFFile {
let userImage = oneobject["imageFile"] as! PFFile
let imageURL = userImage.url
let OneBigObject = Details(username: username, text: text, CreatedAt: time, image: imageURL!, objID: objID, likedBy: likedBy, comments: comments)
self.arrayOfDetails.append(OneBigObject)
dispatch_async(dispatch_get_main_queue()) { self.collectionView.reloadData() }
}
}
}
}
}
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int
{
return self.arrayOfDetails.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell
{
let imageCell = collectionView.dequeueReusableCellWithReuseIdentifier("imageCell", forIndexPath: indexPath) as? CollectionViewCell
let post = self.arrayOfDetails[indexPath.row]
imageCell?.flagContentButton.titleLabel?.adjustsFontSizeToFitWidth = true
imageCell?.uploadedTimeLabel.adjustsFontSizeToFitWidth = true
imageCell?.commentsButton.titleLabel?.adjustsFontSizeToFitWidth = true
imageCell?.likeButton.enabled = true
if (self.arrayOfDetails.count > indexPath.row) {
imageCell?.imageText.text = post.text
imageCell?.imageText.numberOfLines = 0
imageCell?.imageText.verticalTextAlignmentCenter = true
imageCell?.imageText.minFontSize = 9
imageCell?.likeButton.setTitle(post.likedBy.count.description, forState: UIControlState.Normal)
imageCell?.commentsButton.setTitle("Comments(\(String(post.comments.count.description)))", forState: UIControlState.Normal)
imageCell?.objectID.append(post.objID)
imageCell?.uploadedTimeLabel.text = post.CreatedAt.timeAgo
if (post.likedBy.containsObject((PFUser.currentUser()?.username)!!)){
imageCell?.likeButton.setBackgroundImage(self.LikeDone, forState: UIControlState.Normal)
}
else{
imageCell?.likeButton.setBackgroundImage(self.Like, forState: UIControlState.Normal)
}
imageCell?.imageView.setImageWithUrl(NSURL(string: post.image)!, placeHolderImage: UIImage(named: "Placeholder"))
}
return imageCell!
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, sizeForItemAtIndexPath indexPath: NSIndexPath) -> CGSize {
return CGSizeMake(UIScreen.mainScreen().bounds.size.width, UIScreen.mainScreen().bounds.size.width+140)
}
}
这是我的CollectionViewCell.swift：
import UIKit
import Parse
import ActiveLabel
class CollectionViewCell: UICollectionViewCell {
@IBOutlet var imageView: UIImageView!
@IBOutlet var imageText: ActiveLabel!
@IBOutlet var uploadedTimeLabel: UILabel!
@IBOutlet var flagContentButton: UIButton!
@IBOutlet var likeButton: UIButton!
@IBOutlet var commentsButton: UIButton!
var objectID = [String]()
}
这是我在Parse.com中上课的样子：
所以我的问题是：是否有任何更快或更简单的方法从Parse.com获取数据并将其传输到我的UICollectionView？
最佳答案
编辑：我添加了一些我的代码如下，以保持它尽可能的干净。
您可以做的最大的结构化操作就是将接收到的PFObject放入一个数组中，并使用该数组填充您的集合视图。我认为没有必要解析成第二个对象。
var spotsArray = [PFObject]()
func getParseData(){
let query = PFQuery(className: "Places")
query.findObjectsInBackgroundWithBlock { (objects, error) -> Void in
self.spotsArray = objects!
self.spotsCollectionView.reloadData()
}
if refreshControl.refreshing {
refreshControl.endRefreshing()
}
}
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return spotsArray.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! SpotsCell
let currentSpot = spotsArray[indexPath.row]
cell.titleLabel.text = (currentSpot["Title"] as! String)
if let descTemp = (currentSpot["Desc"] as? String){
cell.descLabel.text = descTemp
let userImageFile = currentSpot["imageFile"] as! PFFile
userImageFile.getDataInBackgroundWithBlock {
(imageData: NSData?, error: NSError?) -> Void in
if error == nil {
if let imageData = imageData {
cell.selectedImageView.image = UIImage(data:imageData)
}
}
}
}
return cell
}
上面的代码来自项目here.