仅使用Kingfisher库获取UIImage

Question

我只需要获取UIImage,而不是使用Kingfisher库加载普通的UIImageView

为了实现它,我使用UIImageView实现了一个解决方法:

let imageView = UIImageView()

imageView.kf_setImageWithURL(NSURL(string: cpa.imageName)!, placeholderImage: nil,
        optionsInfo: [.Transition(ImageTransition.Fade(1))],
        progressBlock: { receivedSize, totalSize in
            print("\(receivedSize)/\(totalSize)")
        },
        completionHandler: { image, error, cacheType, imageURL in
            anView!.image = image //anView IS NOT an UIImageView
            anView!.frame.size = CGSize(width: 15.0, height: 15.0)
            print("Finished")
    })

这段代码完美无缺,但我希望以更干净的方式完成.这个库中有一个方法只能获得UIImage吗？异步和缓存

Answer 1

您可以使用此retrieveImage(with:options:progressBlock: completionHandler:)方法KingfisherManager.

也许是这样的:

KingfisherManager.shared.retrieveImage(with: url, options: nil, progressBlock: nil, completionHandler: { image, error, cacheType, imageURL in
    print(image)
})

Answer 2

这是在kingFisher 5中下载图像的最新语法（在swift 4.2中测试）

func downloadImage(`with` urlString : String){
    guard let url = URL.init(string: urlString) else {
        return
    }
    let resource = ImageResource(downloadURL: url)

    KingfisherManager.shared.retrieveImage(with: resource, options: nil, progressBlock: nil) { result in
        switch result {
        case .success(let value):
            print("Image: \(value.image). Got from: \(value.cacheType)")
        case .failure(let error):
            print("Error: \(error)")
        }
    }
}

如何调用以上功能

self.downloadImage(with: imageURL) //replace with your image url

Answer 3

使用新的Swift 3版本,您可以使用ImageDownloader:

ImageDownloader.default.downloadImage(with: url, options: [], progressBlock: nil) {
    (image, error, url, data) in
    print("Downloaded Image: \(image)")
}

ImageDownloader是翠鸟的一部分,所以不要忘记import Kingfisher.

Answer 4

斯威夫特 5：

我将在@Hardik Thakkar回答上完成添加更改，以便您可以使用闭包返回图像，这可能对某人有所帮助：

func downloadImage(with urlString : String , imageCompletionHandler: @escaping (UIImage?) -> Void){
        guard let url = URL.init(string: urlString) else {
            return  imageCompletionHandler(nil)
        }
        let resource = ImageResource(downloadURL: url)
        
        KingfisherManager.shared.retrieveImage(with: resource, options: nil, progressBlock: nil) { result in
            switch result {
            case .success(let value):
                imageCompletionHandler(value.image)
            case .failure:
                imageCompletionHandler(nil)
            }
        }
    }

如何调用：

 downloadImage(with :yourUrl){image in
     guard let image  = image else { return}
      // do what you need with the returned image.
 }

Answer 5

在《翠鸟5》中

imageView.kf.setImage(with: url) { result in
   switch result {
   case .success(let value):
       print("Image: \(value.image). Got from: \(value.cacheType)")
   case .failure(let error):
       print("Error: \(error)")
   }
 } 

查看更多：https ://github.com/onevcat/Kingfisher/wiki/Kingfisher-5.0-Migration-Guide

Answer 6

Kingfisher 5 中的另一种方式：

KingfisherManager.shared.retrieveImage(with: url) { result in
    let image = try? result.get().image
    if let image = image {
        ...
    }
}

Answer 7

雨燕 5 翠鸟 5

此代码 100% 有效

YourImageView.kf.setImage(with: URL(string: imagePath), placeholder: nil, options: nil, progressBlock: nil, completionHandler: { result in
switch result {
    case .success(let value):
                print("Image: \(value.image). Got from: \(value.cacheType)")
    case .failure(let error):
                print("Error: \(error)")
    }
})

//OR
let resource = ImageResource(downloadURL: picUrl!)
KingfisherManager.shared.retrieveImage(with: resource, options: nil, progressBlock: nil) { result in
    switch result {
        case .success(let value):
        print("Image: \(value.image). Got from: \(value.cacheType)")
        imageProfile = value.image
        case .failure(let error):
            print("Error: \(error)")
        }
    }