在Collectionview中顯示多個Parse.com行圖像？

Question

我只有一個班級，叫做“館藏”。 在該類中，我有多個列用於“名稱”，“位置”，“ image1”，“ image2”，“ image3”和“ image4”。

如果我只處理單個圖像和一個表格視圖，那么我就不會有麻煩。 但是我正在冒險探索我現在所了解的東西，而且似乎無法在任何地方找到任何與Swift相關的示例。 我看到它提到要么使用少量的列文件/圖像就可以了（就像我正在做的3-4步一樣），如果要使用更多的列來做關系（不管是什么）。
不幸的是，我還沒有找到任何有關如何實際下拉圖像（如果存在）的示例。

代碼在下面，但是它所做的就是提取image1圖像，因為我也不知道如何在集合視圖中獲取image2，image3和image4。

...在這里刪除了一堆無效的代碼...

在此處添加新代碼：

這是變量：

class ParseCollectionViewController: UIViewController, UICollectionViewDataSource, UICollectionViewDelegate, UISearchBarDelegate {

var currentObject : PFObject?
var collectionImages: [PFFile]?
var tappedObjectID: String!
var imageObject0: PFFile!
var imageObject1: PFFile!
var imageObject2: PFFile!
var imageObject3: PFFile!
var imageObject4: PFFile!
var imageObject5: PFFile!
var imageArray: [UIImage] = []
var collectionImage0: UIImage!
var collectionImage1: UIImage!
var collectionImage2: UIImage!
var collectionImage3: UIImage!
var collectionImage4: UIImage!
var collectionImage5: UIImage!
var imageView: PFImageView!

這是非常丑陋的代碼...我確定這對數組來說是完美的工作，但是我不確定如何做到這一點：

    func loadCollectionViewData() {

    // Build a parse query object
    var query = PFQuery(className:"Collections")
    query.whereKey("objectId", equalTo:tappedObjectID)
    query.findObjectsInBackgroundWithBlock({
        (objects: [AnyObject]?, error: NSError?) -> Void in
        if error == nil {
            println("Successfully retrieved \(objects!.count) records.")

            self.imageArray.removeAll(keepCapacity: true)

            for object in objects! {

                self.imageObject0 = object["image0"] as! PFFile
                self.imageObject0.getDataInBackgroundWithBlock({
                    (imageData: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        self.collectionImage0 = UIImage(data:imageData!)!
                        println("Image0 successfully retrieved")
                        println(self.collectionImage0)


                    }

                    self.imageArray.append(self.collectionImage0)
                    self.collectionView.reloadData()
                    println("image0 imageArray: \(self.imageArray)")

                })

                self.imageObject1 = object["image1"] as! PFFile
                self.imageObject1.getDataInBackgroundWithBlock({
                    (imageData: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        self.collectionImage1 = UIImage(data:imageData!)!
                        println("Image1 successfully retrieved")
                        println(self.collectionImage1)


                    }

                    self.imageArray.append(self.collectionImage1)
                    self.collectionView.reloadData()
                    println("image1 imageArray: \(self.imageArray)")

                })

                self.imageObject2 = object["image2"] as! PFFile
                self.imageObject2.getDataInBackgroundWithBlock({
                    (imageData: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        self.collectionImage2 = UIImage(data:imageData!)!
                        println("Image2 successfully retrieved")
                        println(self.collectionImage2)


                    }

                    self.imageArray.append(self.collectionImage2)
                    self.collectionView.reloadData()
                    println("image0 imageArray: \(self.imageArray)")

                })

                self.imageObject3 = object["image3"] as! PFFile
                self.imageObject3.getDataInBackgroundWithBlock({
                    (imageData: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        self.collectionImage3 = UIImage(data:imageData!)!
                        println("Image3 successfully retrieved")
                        println(self.collectionImage3)


                    }

                    self.imageArray.append(self.collectionImage3)
                    self.collectionView.reloadData()
                    println("image3 imageArray: \(self.imageArray)")

                })

                self.imageObject4 = object["image4"] as! PFFile
                self.imageObject4.getDataInBackgroundWithBlock({
                    (imageData: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        self.collectionImage4 = UIImage(data:imageData!)!
                        println("Image4 successfully retrieved")
                        println(self.collectionImage4)


                    }

                    self.imageArray.append(self.collectionImage4)
                    self.collectionView.reloadData()
                    println("image4 imageArray: \(self.imageArray)")

                })

                self.imageObject5 = object["image0"] as! PFFile
                self.imageObject5.getDataInBackgroundWithBlock({
                    (imageData: NSData?, error: NSError?) -> Void in
                    if error == nil {
                        self.collectionImage5 = UIImage(data:imageData!)!
                        println("Image0 successfully retrieved")
                        println(self.collectionImage5)


                    }

                    self.imageArray.append(self.collectionImage5)
                    self.collectionView.reloadData()
                    println("image5 imageArray: \(self.imageArray)")

                })

            }

        } else {
            NSLog("Error: %@ %@", error!, error!.userInfo!)
        }


    })

        self.collectionView.reloadData()

}

這是細胞的東西：

    func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {

    return imageArray.count
}

func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {

    let cell = collectionView.dequeueReusableCellWithReuseIdentifier("cell", forIndexPath: indexPath) as! ParseCollectionViewCell

    cell.cellImage.image = UIImage(named: "question")

    cell.cellImage.image = imageArray[indexPath.row]

    return cell
}
    func collectionView(collectionView: UICollectionView, didSelectItemAtIndexPath indexPath: NSIndexPath) {
    let tappedObject = imageArray[indexPath.row]

    performSegueWithIdentifier("CollectionViewToDetailView", sender: tappedObject)
}

// In a storyboard-based application, you will often want to do a little preparation before navigation
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {

    var detailObject : PFObject?
    if let imageArray = sender as? PFObject{
        detailObject = sender as? PFObject
    } else {
        // No cell selected in collectionView
        detailObject = PFObject(className:"Collections")
    }

    // Get a handle on the next story board controller and set the currentObject ready for the viewDidLoad method
    var detailScene = segue.destinationViewController as! ParseDetailViewController
    detailScene.detailObject = (detailObject)
    detailScene.currentObject = (currentObject)
}

由於隨機加載，我要么需要弄清楚如何以一定順序強制加載圖像，要么必須弄清楚在點擊它時哪個圖像才可以正確地傳遞給下一個ViewController。是局部視圖控制器。

Answer 1

您必須為單元格中的圖像制作更多的UIImageViews（或PFImageViews），然后為其余圖像重復第一張圖像的圖像（但更改其名稱以匹配它們在解析時存儲的列）

另外，您可能想要實現PFImageViews並使用其文件屬性和loadInBackground（）方法。

編輯：您可以遍歷接收到的對象並將圖像放置到新數組中，並將其用於收藏視圖。

代碼示例：

var parseOjbect = ["image1":NSData(), "image2":NSData(),"image3":NSData(),"image4":NSData()]

var receivedParseObjects = [parseOjbect]

var photosForCollectionView = [NSData]()

for receivedParseObject in receivedParseObjects {

photosForCollectionView.append(receivedParseObject["image1"]!)
photosForCollectionView.append(receivedParseObject["image2"]!)
photosForCollectionView.append(receivedParseObject["image3"]!)
photosForCollectionView.append(receivedParseObject["image4"]!)
}