кеширование с alamofireimages

Question

У меня есть представление коллекции, которое отображает изображения, некоторые из них кэшируются и правильно извлекаются, а другие нет. В представлении коллекции отображаются две квадратные ячейки в строке.

Я не могу понять, почему иногда изображения берутся из кеша, а в другое время нужно снова загружать.

здесь, где я кэшировать изображения:

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) 
} 

}

и вот класс Cell:

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) 
      } 
     } 
    } 
} 

}

Answer 1

Я поделюсь все коды ниже.

ПЕРВЫЙ Вам необходимо обновить ImageRequest класс

import UIKit 
import Alamofire 

class ImageRequest { 

    var decodeOperation: Operation? 
    var request: DataRequest 

    init(request: DataRequest) { 
     self.request = request 
    } 

    func cancel() { 
     decodeOperation?.cancel() 
     request.cancel() 
    } 

} 

ВТОРОЙ

import UIKit 
import Alamofire 
import AlamofireImage 

class DataImage { 

    static let sharedManager = DataImage() 
    let decoder = ImageDecoder() 
    let photoCache = AutoPurgingImageCache(
     memoryCapacity: 100 * 1024 * 1024, 
     preferredMemoryUsageAfterPurge: 60 * 1024 * 1024 
    ) 

    //MARK: - Read Data 

    func allPhotos() -> [GlacierScenic] { 
     if !photos.isEmpty { return photos } 
     guard let data = NSArray(contentsOfFile: dataPath()) as? [NSDictionary] else { return photos } 
     for photoInfo in data { 
      let name = photoInfo["name"] as! String 
      let urlString = photoInfo["imageURL"] as! String 
      let glacierScenic = GlacierScenic(name: name, photoURLString: urlString) 
      photos.append(glacierScenic) 
     } 
     return photos 
    } 

    func dataPath() -> String { 
     return Bundle.main.path(forResource: "GlacierScenics", ofType: "plist")! 
    } 

    //MARK: - Image Downloading 

    func getNetworkImage(urlString: String, completion: @escaping ((UIImage) -> Void)) -> (ImageRequest) { 
     let queue = decoder.queue.underlyingQueue 
     let request = Alamofire.request(urlString) 
     let imageRequest = ImageRequest(request: request) 
     imageRequest.request.response(
    queue: queue, 
      responseSerializer: DataRequest.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: @escaping ((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.add(image, withIdentifier: urlString) 
    } 

    func cachedImage(_ urlString: String) -> Image? { 
     return photoCache.image(withIdentifier: urlString) 
    } 

} 

ТРЕТЬИХ

Мои данные стручка файл.

source 'https://github.com/CocoaPods/Specs.git' 
platform :ios, '10.0' 
use_frameworks! 

target 'projetname' do 
    pod 'Alamofire', :git => 'https://github.com/Alamofire/Alamofire.git', :tag => '4.0.0' 
    pod 'AlamofireImage', :git => 'https://github.com/Alamofire/AlamofireImage.git', :tag => '3.1.0' 
end 

post_install do |installer| 
    installer.pods_project.targets.each do |target| 
     target.build_configurations.each do |config| 
      config.build_settings['SWIFT_VERSION'] = '3.0' 
     end 
    end 
end