从解析中查询图像和文本 [英] Query image and text from parse

问题描述

所以我创建了一个用户可以上传图像和文本的应用程序.帖子将显示在 UICollectionView 中，我将在下面提供一些代码供您查看.

So I am create a application that users can upload images and text. The posts will be shown in UICollectionView I will provide some code for you to see below.

所以我的 PostsViewController 看起来像这样:

So my PostsViewController looks something like this:

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:

And this is my 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 中的类的样子:

This is how my class in Parse.com looks like:

所以我的问题是:有没有更快或更简单/容易的方法来从 Parse.com 获取数据，以及我的 UICollectionView?

So my question is: Is there any faster or more simple/easy way to get the data from Parse.com, and to my UICollectionView?

推荐答案

我在下面添加了一些代码以使其尽可能干净.

I added some of my code below to keep it as clean as possible.

您可以做的最大的结构性事情就是将接收到的 PFObjects 放入一个数组中，并使用该数组来填充您的集合视图.我认为没有必要解析到那个次要对象.

The biggest structural thing you could do is just drop the received PFObjects into an array and use that array to populate your collection view. I see no need for parsing into that secondary object.

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.

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