swift - 如何在 Swift 4 中使用 SDWebImage 缓存从 firebase 存储中获取的图像数组？

Question

我正在以数据的形式从 firebase 存储中获取图像，我想使用 SDWebImage 将图像缓存在我的应用程序中。请指导我如何实现它？

 for x in images_list{

                let storageRef = storage.child("images/\(x).jpg")
                storageRef.getData(maxSize: 1 * 1024 * 1024) { (data, error) in
                    if let error = error{
                        print(error.localizedDescription)
                        return
                    }
                    else{
                        imagesarray.append(UIImage(data: data!)!)
                    }
                    if let x = images_list.last{
                                cell.imageDemo.animationImages = imagesarray
                                cell.imageDemo.sd_setImage(with: storageRef) // Here I Want to cache the images of **imagesarray** that are being animated
                                cell.imageDemo.animationDuration = 2
                                cell.imageDemo.startAnimating()

                    }
                }


            }

Answer 1

您在问题中直接从 firebase 下载 imageData。您将需要使用 downloadURL 方法，而不是使用 getData。像这样:

for x in image_list {

        let storageRef = storage.child("images/\(x).jpg")

        //then instead of downloading data download the corresponding URL
        storageRef.downloadURL { url, error in
            if let error = error {

            } else {

                //make your imageArray to hold URL rather then images directly
                imagesArray.append(url)
            }
        }

    }

    //////This is were you would use those url////////
    let url = imageArray.first!
    imageView.sd_setImage(with: url, completed: nil)

这里最重要的部分是下载 url 而不是图像数据。每当您将图像 url 设置为 imageView 时，SDWebImage 库将缓存它并在已缓存时显示