uiimageview-download's Introduction

UIImageView-Download

Lazy load for images. Download images and save them locally, while showing it inside the UIImageView, if still available. If a local image already exists it will be loaded immediately, then the download will start and the local image will be updated.

 ```
 func downloadImageFrom(link: URL, contentMode: UIView.ContentMode, savePath: String, manageError: ManageDownloadImageError?) {
    
    if let localImage = UIImage(contentsOfFile: savePath) {
        self.image = localImage
        self.contentMode = contentMode
        self.backgroundColor = .white
    }
    
    URLSession.shared.dataTask(with: link, completionHandler: { (data, _, _) -> Void in
        
        DispatchQueue.main.async { [weak self] in
            
            if let imageData = data,
                let downloadedImage = UIImage(data: imageData) {
                
                self?.contentMode =  contentMode
                self?.image = downloadedImage
                self?.backgroundColor = .white
                
                DispatchQueue.global(qos: .background).async {
                    do {
                        let url = URL(fileURLWithPath: savePath)
                        try downloadedImage.jpegData(compressionQuality: 1.0)?.write(to: url)
                        
                    } catch {
                        
                        manageError?(.localSave)
                        
                    }
                }
                
            }else{
                
                manageError?(.download)
                
            }
        }
    }).resume()
}

} ```

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