1
我有一個集合視圖,顯示圖像,其中一些緩存和正確檢索,但其他人沒有。 集合視圖每行顯示兩個平方單元格。緩存與alamofireimages
我不明白爲什麼有時圖像是從緩存中獲取的,其他時間需要重新下載。
在這裏,我緩存圖像:
class DataImage {
static let sharedManager = DataImage()
let decoder = ImageDecoder()
let photoCache = AutoPurgingImageCache(
memoryCapacity: 100 * 1024 * 1024,
preferredMemoryUsageAfterPurge: 60 * 1024 * 1024
)
//MARK: - Image Downloading
func getNetworkImage(urlString: String, completion: (UIImage -> Void)) -> (ImageRequest) {
let queue = decoder.queue.underlyingQueue
let request = Alamofire.request(.GET, urlString)
let imageRequest = ImageRequest(request: request)
imageRequest.request.response(
queue: queue,
responseSerializer: Request.imageResponseSerializer(),
completionHandler: { response in
guard let image = response.result.value else {
return
}
let decodeOperation = self.decodeImage(image) { image in
completion(image)
self.cacheImage(image, urlString: urlString)
}
imageRequest.decodeOperation = decodeOperation
}
)
return imageRequest
}
func decodeImage(image: UIImage, completion: (UIImage -> Void)) -> DecodeOperation {
let decodeOperation = DecodeOperation(image: image, decoder: self.decoder, completion: completion)
self.decoder.queue.addOperation(decodeOperation)
return decodeOperation
}
//MARK: - Image Caching
func cacheImage(image: Image, urlString: String) {
photoCache.addImage(image, withIdentifier: urlString)
}
func cachedImage(urlString: String) -> Image? {
print("image: \(photoCache.imageWithIdentifier(urlString))")
return photoCache.imageWithIdentifier(urlString)
}
}
,這裏是Cell類:
class StoreCell: UICollectionViewCell {
@IBOutlet weak var title: UILabel!
@IBOutlet weak var storyImage: UIImageView!
@IBOutlet weak var subTitle: UILabel!
@IBOutlet weak var cost: UILabel!
var imageFilename: String!
var request: ImageRequest!
var dataImage = DataImage()
func configure() {
self.layer.cornerRadius = 3.0
reset()
loadImage()
}
func reset() {
storyImage.image = nil
request?.cancel()
}
func loadImage() {
let stringURL = "https://........\(imageFilename)"
if self.storyImage.image == nil {
if let image = dataImage.cachedImage(stringURL) {
self.storyImage.image = image
} else {
request = dataImage.getNetworkImage(stringURL) { image in
self.storyImage.image = image
self.storyImage.runImageTransition(.CrossDissolve(0.2), withImage: image)
}
}
}
}
}
嘿,你是否設法解決這個問題?這裏有什麼問題?謝謝! – user3766930
不,我沒有。無論如何,Swift 3的imageRequest.request.response會給你一個錯誤。 – Giovanni