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我想完成的工作：對於這個項目，我只提到兩個源文件：（1）RPPhotoLibrary.swift - 一個UICollectionViewController和（2）PhotoThumbnail.swift： - 一個UICollectionViewCell。我想從用戶的照片庫（最好是全部）加載圖像（和視頻），並將它們呈現在UICollectionViewController中每個單元的UICollectionViewCell中。出於某種原因，我能夠加載照片，但不是能夠加載所有照片。這是我的第一個源文件代碼：RPPhotoLibrary.swift：如何將照片庫加載到UICollectionView？ Swift
import UIKit
import Photos
private let reuseIdentifier = "PhotoCell"
class RPPhotoLibrary: UICollectionViewController, UIImagePickerControllerDelegate {
// By default make locating album false
var assetCollection: PHAssetCollection!
var photosAsset: PHFetchResult!
var assetThumbnailSize: CGSize!
@IBAction func cancelButton(sender: AnyObject) {
self.dismissViewControllerAnimated(false, completion: nil)
}
// =================== THIS BUTTON TAKES A PHOTO =====================================================
@IBAction func captureMoment(sender: AnyObject) {
let imagePicker = UIImagePickerController()
if (UIImagePickerController.isSourceTypeAvailable(.Camera)) {
if UIImagePickerController.availableCaptureModesForCameraDevice(.Rear) != nil {
imagePicker.allowsEditing = true
imagePicker.sourceType = .Camera
imagePicker.cameraCaptureMode = .Photo
presentViewController(imagePicker, animated: false, completion: {})
} else {
// postAlert("Rear camera does not exist", message: "RedPlanet cannot access the camera")
var alert = UIAlertView(title: "Your phone doesn't have a rear camera!",
message: "RedPlanet cannot access the camera.",
delegate: self,
cancelButtonTitle: "ok")
alert.show()
}
} else {
// postAlert("Camera not accessible", message: "RedPlanet cannot access the camera")
var alert = UIAlertView(title: "Cannot access camera.",
message: "RedPlanet cannot access the camera.",
delegate: self,
cancelButtonTitle: "ok")
alert.show()
}
}
@IBOutlet weak var thumbNail: UIImageView!
override func viewDidLoad() {
super.viewDidLoad()
let fetchOptions = PHFetchOptions()
let collection:PHFetchResult = PHAssetCollection.fetchAssetCollectionsWithType(.Moment, subtype: .Any, options: fetchOptions)
if let first_Obj:AnyObject = collection.firstObject{
//found the album
self.assetCollection = first_Obj as! PHAssetCollection
}
}
override func viewWillAppear(animated: Bool) {
// Get size of the collectionView cell for thumbnail image
if let layout = self.collectionView!.collectionViewLayout as? UICollectionViewFlowLayout{
let cellSize = layout.itemSize
self.assetThumbnailSize = CGSizeMake(cellSize.width, cellSize.height)
}
//fetch the photos from collection
self.photosAsset = PHAsset.fetchAssetsInAssetCollection(self.assetCollection, options: nil)
self.collectionView!.reloadData()
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
override func prepareForSegue(segue: UIStoryboardSegue, sender: AnyObject?) {
if(segue.identifier == "selectedPhoto(s)"){
if let controller: SelectedPhoto = segue.destinationViewController as? SelectedPhoto{
if let cell = sender as? PhotoThumbnail {
if let indexPath: NSIndexPath = self.collectionView!.indexPathForCell(cell){
controller.index = indexPath.item
controller.photosAsset = self.photosAsset
controller.assetCollection = self.assetCollection
}
}
}
}
}
// MARK: UICollectionViewDataSource
override func numberOfSectionsInCollectionView(collectionView: UICollectionView) -> Int {
// #warning Incomplete implementation, return the number of sections
return 1
}
override func collectionView(collectionView: UICollectionView, numberOfItemsInSection section: Int) -> Int {
// #warning Incomplete implementation, return the number of items
var count: Int = 0
if(self.photosAsset != nil){
count = self.photosAsset.count
}
return count;
}
override func collectionView(collectionView: UICollectionView, cellForItemAtIndexPath indexPath: NSIndexPath) -> UICollectionViewCell {
let cell: PhotoThumbnail = collectionView.dequeueReusableCellWithReuseIdentifier(reuseIdentifier, forIndexPath: indexPath) as! PhotoThumbnail
//Modify the cell
let asset: PHAsset = self.photosAsset[indexPath.item] as! PHAsset
PHImageManager.defaultManager().requestImageForAsset(asset, targetSize: self.assetThumbnailSize, contentMode: .AspectFill, options: nil, resultHandler: {(result, info)in
if let image = result {
cell.setThumbnailImage(image)
}
})
return cell
}
// MARK: - UICollectionViewDelegateFlowLayout methods
func collectionView(collectinView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumLineSpacingForSectionAtIndex section: Int) -> CGFloat {
return 4
}
func collectionView(collectionView: UICollectionView, layout collectionViewLayout: UICollectionViewLayout, minimumInteritemSpacingForSectionAtIndex section: Int) -> CGFloat {
return 1
}
// UIImagePickerControllerDelegate Methods
func imagePickerControllerDidCancel(picker: UIImagePickerController){
picker.dismissViewControllerAnimated(true, completion: nil)
}
// MARK: UICollectionViewDelegate
/*
// Uncomment this method to specify if the specified item should be selected
override func collectionView(collectionView: UICollectionView, shouldSelectItemAtIndexPath indexPath: NSIndexPath) -> Bool {
return true
}
*/
// Uncomment these methods to specify if an action menu should be displayed for the specified item, and react to actions performed on the item
override func collectionView(collectionView: UICollectionView, shouldShowMenuForItemAtIndexPath indexPath: NSIndexPath) -> Bool {
return false
}
override func collectionView(collectionView: UICollectionView, canPerformAction action: Selector, forItemAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) -> Bool {
return false
}
override func collectionView(collectionView: UICollectionView, performAction action: Selector, forItemAtIndexPath indexPath: NSIndexPath, withSender sender: AnyObject?) {
self.dismissViewControllerAnimated(false, completion: nil)
}
}
這裏是我的第二個源文件（2）代碼：PhotoThumbnail.swift：
import UIKit
class PhotoThumbnail: UICollectionViewCell {
@IBOutlet weak var thumbNail: UIImageView!
func setThumbnailImage(thumbNailImage: UIImage) {
self.thumbNail.image = thumbNailImage
}
}
問題：出於某種原因，我無法加載全部來自8列照片庫的圖像，我想從照片庫中加載4張照片。如果任何人都可以幫我解決問題，甚至可以給我一些這樣的教程，那將不勝感激！感謝先進的哈哈。
我將如何處理在PHFetchResult所有對象？ – user4513956
我建議不要使用集合。只需使用PHAsset.fetchAssetsWithOptions（PHFetchOptions（）），您將在一個提取結果中接收所有資產。 – Tish
廢話，我很困難。對不起，但你介意幫我找這樣的教程嗎？ – user4513956