Swift 因表视图刷新导致网络图片闪烁的问题

解决方案：使用网络缓存的图片

    // import YYWebImage

    // MARK: 设置网络图片
    func c_webImage(_ url: String, _ placeholder: String = "EXAssets40") {
        if let image = YYWebImageManager.shared().cache?.getImageForKey(url) {
            
            self.image = image
        } else {
            if let imgUrl = URL.init(string: url) {
                
                
                YYWebImageManager.shared().requestImage(with: imgUrl,
                                                        options: .useNSURLCache,
                                                        progress: nil,
                                                        transform: nil){[weak self] (image, url , type, stage, err) in
                        
                        guard let `self` = self else {return}
                        
                        DispatchQueue.main.async(execute: {
                            if let downloadedImg = image {
                                self.image = downloadedImg
                            } else {
                                self.image = UIImage.init(named: placeholder)
                            }
                        })
                    }
            } else {
                self.image = CTools.getImage(placeholder)
            }
        }
    }