查詢圖片和文字解析

Question

所以我創建了一個應用程序，用戶可以上傳圖片和文字。這些帖子將顯示在UICollectionView中我將提供一些代碼供您在下面看到。

所以我PostsViewController看起來是這樣的：

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) 
    } 
} 

這是我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]() 
} 

這是我在Parse.com類的樣子：

所以我的問題是：有沒有更快或更簡單/容易的方法從Parse.com和我的UICollectionView獲取數據？

Answer 1

編輯：我添加了一些我的代碼，以保持儘可能乾淨。

您可以做的最大的結構性事情就是將接收到的PFObjects放入一個數組中，並使用該數組填充您的集合視圖。我認爲不需要解析該次要對象。

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 

} 

上面的代碼是從項目here.