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我有2 UICollectionViewControllers与（据我所知）相同的代码和故事板设置。此应用程序使用Pinterest SDK，因此我一次下载电路板和引脚25。UICollectionView比dataSource.count显示更少的单元格
第一个CollectionViewController数据源（使用80个板子），将显示80个板子。第二个CollectionViewController（例如使用80个引脚）将只显示25个引脚。
我说的每一个print(indexPath.row)语句的cellForRowAtIndexPath
的正常运行CVC打印1,2,3,4,5,6,7,8,9,10等
第二届CVC打印1,2,3,4,5然后1,2,3,4,5 1,2,3,4,5等
任何人都可以弄清楚发生了什么事？编辑：下面的第2个CVC的代码，我已经去掉了所有不相关的代码：
class PinCollectionViewController: UICollectionViewController, UICollectionViewDelegateFlowLayout {
//TODO: V2.0 FIND (1) duplicate pins (2) pins with out descriptions
var pins = [PDKPin]()
var imageArray = [UIImage]()
var boardID = String()
var boardName = String()
var fetchingMore = false
var currentResponseObject = PDKResponseObject()
var activityIndicatorView: ActivityIndicatorView!
override func viewDidLoad() {
super.viewDidLoad()
if let layout = collectionView?.collectionViewLayout as? PinterestLayout {
layout.delegate = self
}
getFirstPinsAndImages()
}
// MARK: UICollectionViewDataSource
override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
return 1
}
override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
return self.pins.count
}
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! PinCollectionViewCell
cell.pinText?.text = self.pins[indexPath.row].descriptionText
cell.pinImage?.pin_updateWithProgress = true
if let pinImageURL = self.pins[indexPath.row].largestImage().url {
cell.pinImage?.pin_setImageFromURL(pinImageURL)
}
return cell
}
override func collectionView(collectionView: UICollectionView, willDisplayCell cell: UICollectionViewCell, forItemAtIndexPath indexPath: NSIndexPath) {
getRestOfPinsAndImages()
}
func loadImages(imageURLs: [NSURL], completion: [(url:NSURL, image:UIImage?)] -> Void) {
var downloads = imageURLs.count
let session = NSURLSession.sharedSession()
var images = [(url:NSURL, image:UIImage?)]()
for url in imageURLs {
let task = session.dataTaskWithURL(url) { (data, reponse, error) in
var image:UIImage?
if let data = data {
image = UIImage(data: data)
}
dispatch_sync(blocksDispatchQueue) {
//print("dispatch_Sync inside loadImages")
images.append((url:url, image:image))
downloads--
}
if downloads == 0 {
self.allImagesLoaded = true
// Alternative way of completing to ensure run on main thread
dispatch_async(dispatch_get_main_queue()) { completion(images) }
}
}
task.resume()
}
}
func getFirstPinsAndImages() {
PDKClient.sharedInstance().getBoardPins(boardID, fields: ["id", "image", "note", "link"], withSuccess: { (responseObject :PDKResponseObject!) -> Void in
self.currentResponseObject = responseObject
guard let pinsAsPDKPin = responseObject.pins() as? [PDKPin] else {
return
}
self.pins = pinsAsPDKPin
if let imageURLs = (pinsAsPDKPin.map { $0.largestImage().url }) as? [NSURL] {
//get images
self.loadImages(imageURLs, completion: {results in
// scan through results for the images found and
// add to array of images to display
for r in results {
if let image = r.image {
self.imageArray.append(image)
}
}
})
}
dispatch_async(dispatch_get_main_queue(),{
self.collectionView?.reloadData()
})
}) { (err :NSError!) -> Void in
print("error NSError: \(err)")
}
}
func getRestOfPinsAndImages() {
if self.fetchingMore == false && self.currentResponseObject.hasNext() {
self.fetchingMore = true
self.currentResponseObject.loadNextWithSuccess({ (nextResponseObject :PDKResponseObject!) -> Void in
self.fetchingMore = false
self.currentResponseObject = nextResponseObject
guard let pinsAsPDKPin = nextResponseObject.pins() as? [PDKPin] else { return }
for pin in pinsAsPDKPin {
self.pins.append(pin)
}
if let imageURLs = (pinsAsPDKPin.map { $0.largestImage().url }) as? [NSURL] {
self.loadImages(imageURLs, completion: {results in
// scan through results for the images found and
// add to array of images to display
for r in results {
if let image = r.image {
self.imageArray.append(image)
}
}
})
}
if !self.currentResponseObject.hasNext() {
} else {
self.getRestOfPinsAndImages()
}
dispatch_async(dispatch_get_main_queue(),{
self.collectionView?.reloadData()
})
}) { (err :NSError!) -> Void in
print("error NSError: \(err)")
}
}
}
}
extension PinCollectionViewController : PinterestLayoutDelegate {
// 1
func collectionView(collectionView:UICollectionView, heightForPhotoAtIndexPath indexPath: NSIndexPath,
withWidth width: CGFloat) -> CGFloat {
var photo = UIImage()
if allImagesLoaded {
photo = imageArray[indexPath.item]
} else { photo = UIImage(named: "testPic")!}
let boundingRect = CGRect(x: 0, y: 0, width: width, height: CGFloat(MAXFLOAT))
let rect = AVMakeRectWithAspectRatioInsideRect(photo.size, boundingRect)
return rect.size.height
}
// 2
func collectionView(collectionView: UICollectionView,
heightForAnnotationAtIndexPath indexPath: NSIndexPath, withWidth width: CGFloat) -> CGFloat {
var photo = UIImage()
if allImagesLoaded {
photo = imageArray[indexPath.item]
} else { photo = UIImage(named: "testPic")!}
let annotationPadding = CGFloat(4)
let annotationHeaderHeight = CGFloat(17)
let font = UIFont(name: "AvenirNext-Regular", size: 10)!
let commentHeight = CGFloat(10.0)
let height = annotationPadding + annotationHeaderHeight + commentHeight + annotationPadding
return height
}
}
没有你发布代码，任何人都难以评论。 – Michael
这听起来像是你的numberOfSections方法返回的值大于1.所以它显示了每个部分中的5个项目，但是如果没有看到你用来填充视图的方法是无法帮助的。 –
谢谢你们，这是一个很大的班级，所以我试图去掉所有与dataSource – GarySabo