从parsing中查询图像和文本

所以我创build了一个应用程序，用户可以上传图片和文字。 这些post将显示在UICollectionView我会提供一些代码给你看下面。

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]() } 

这就是我在Parse.com中的课程：

所以我的问题是：是否有任何更快或更简单/容易的方式从Parse.com和我的UICollectionView获取数据？

Answer 1

编辑：我添加了一些我的代码，以尽可能保持干净。

你可以做的最大的结构就是将接收到的PFObjects放入一个数组中，并使用该数组填充你的集合视图。 我看到没有必要parsing到第二个对象。

 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 } 

上面的代码来自这里的项目。