Ios 如何使用ObjectId的解析数组填充UICollectionView?
我正在使用Parse.com。我有一个objectId数组(名为“Wants”),我想用每个objectId对应的图像填充UICollectionView。我不太确定从哪里开始 我尝试使用Wherekey为“Wants”的PFQuery,但我不确定在“equalTo”参数中输入什么Ios 如何使用ObjectId的解析数组填充UICollectionView?,ios,swift,parse-platform,Ios,Swift,Parse Platform,我正在使用Parse.com。我有一个objectId数组(名为“Wants”),我想用每个objectId对应的图像填充UICollectionView。我不太确定从哪里开始 我尝试使用Wherekey为“Wants”的PFQuery,但我不确定在“equalTo”参数中输入什么 var downloadCards = PFQuery(className: "User") downloadCards.whereKey("Wants", equalTo:"")
var downloadCards = PFQuery(className: "User")
downloadCards.whereKey("Wants", equalTo:"")
downloadCards.orderByAscending("Number")
downloadCards.limit = 200
downloadCards.findObjectsInBackgroundWithBlock {
(objects: [AnyObject]?, error: NSError?) -> Void in
if error == nil {
if let objects = objects as? [PFObject] {
for object in objects {
objectIds.append(object.objectId!)
parseObjects.append(object["Image"] as! PFFile)
imageNames.append(object["Number"] as! String)
imageExpansions.append(object["ExpansionNumber"] as! String)
self.collectionView.reloadData()
}
}
} else {
println("Error: \(error!) \(error!.userInfo!)")
}
}
此处的集合视图代码:
func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return parseObjects.count
}
func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell: CardsCollectionViewCell = collectionView.dequeueReusableCellWithReuseIdentifier("Cell", forIndexPath: indexPath) as! CardsCollectionViewCell
parseObjects[indexPath.row].getDataInBackgroundWithBlock{
(imageData: NSData?, error: NSError?) -> Void in
if error == nil {
let image = UIImage(data: imageData!)
cell.cardsImg.image = image
}
}
return cell
}
是的,你可以,但是功能
// Initialise the PFQueryTable tableview
override init!(style: UITableViewStyle, className: String!) {
super.init(style: style, className: className)
}
required init(coder aDecoder: NSCoder) {
super.init(coder: aDecoder)
// Configure the PFQueryTableView
self.parseClassName = "yourClass"
self.textKey = "yourObject"
self.pullToRefreshEnabled = true
self.paginationEnabled = false
}
是异步的,因此collectionView函数返回空单元格。最简单的方法是下载所有数据,然后更新集合视图,而不是使用whereKey(key:equal:to)使用whereKeyExists(key)。这将返回具有数组的所有对象
downloadCards.whereKeyExists("Wants")