仅使用 Kingfisher 库获取 UIImage

Question

我只需要获取一个 UIImage 而不是使用 Kingfisher 库加载一个普通的 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")
    })

此代码完美运行，但我想以更简洁的方式进行。 该库中是否有一种方法可以仅获取 UIImage ？异步和缓存

Answer 1

为此，您可以使用

retrieveImage(with:options:progressBlock: completionHandler:)

的

KingfisherManager

方法。

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)")
        }
    }
}

如何调用上面的函数

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

Answer 3

有了新的 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 Kingfisher 的一部分所以不要忘记

import Kingfisher

.

Answer 4

斯威夫特 5:

我将完成 @Hardik Thakkar 的回答以添加更改，以便您可以 return 使用闭包的图像可能会帮助某人：

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)
            }
        }
    }

如何打电话：

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

Answer 5

翠鸟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 6

翠鸟5

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 7

斯威夫特 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)")
        }
    }

Answer 8

如果你想从 api 调用自定义 UILabel instated of UIImageView。

import Kingfisher

func getImage(imageUrl: String,title:String?=nil){

        let someTitle = UILabel()
        view.addSubview(someTitle)
        someTitle.text = title
        someTitle.isHidden = true
       
        someTitle.topAnchor.constraint(equalTo: self.view.topAnchor).isActive = true
        someTitle.bottomAnchor.constraint(equalTo: self.view.bottomAnchor).isActive = true
        someTitle.leadingAnchor.constraint(equalTo: self.view.leadingAnchor).isActive = true
        someTitle.trailingAnchor.constraint(equalTo: self.view.trailingAnchor).isActive = true

        DispatchQueue.main.asyncAfter(deadline: .now() + 0.1) { [self] in
            let url = URL(string: imageUrl )
            yourImage.kf.setImage(
                with: url,
                placeholder:  (someTitle as? Placeholder),
                options: [
                    .loadDiskFileSynchronously,
                    .cacheOriginalImage,
                    .transition(.fade(0.25))
                ],
                completionHandler: { result in
                    // Done
                    switch result {
                    case .success(let value):
                         self.yourImage.image = value.image
                    case .failure(let error):
                        someTitle.isHidden = false
                    }
                }
            )
                        
        }
    }

只需调用控制器中的函数

getImage(imageUrl: you_url, title: your_name)

Answer 9

如果你想有一个自定义的 UIImage 和 UIImageView

let url = URL(string: "https://iosacademy.io/assets/images/brand/icon.jpg")

override func viewDidLoad() {
    super.viewDidLoad()
    addPicture()
    
}

private func addPicture() {
    let containerView = UIView()
    //let myImage = UIImage(named: "Old Scroll Lengmei") // to add UIImage  by code
    let myImage = UIImage()
    let myImageView = UIImageView() // to add UIImageView by code
    let label = UILabel() // to add Label by code
    
    myImageView.kf.setImage(with: url)