Question

我正在尝试从数据库中检索保存的图片（在这种情况下，我从数据库中硬编码了想要的确切图片）。我启动了两个UIImage变量：imageView和rawImage。 imageView正在使用SDWebImage中的FirebaseUI来加载图像，但是我不知道如何将其保存到UIImage数组中。

rawImage正在从Firebase的确切图像的路径中获取数据。我将其转换为UIImage，但是当我要将其附加到UIImage数组时，应用程序崩溃。

class GalleryViewController:UIViewController{
    @IBOutlet weak var imageView: UIImageView!

    @IBOutlet weak var rawImage: UIImageView!

    override func viewDidLoad() {
        super.viewDidLoad()
        view.addVerticalGradientLayer(topColor: primaryColor, bottomColor: secondaryColor)
        self.tabBarController?.tabBar.isHidden = true
        retrievePicture()
    }

    func retrievePicture()
    {
        guard let user_email = Auth.auth().currentUser?.email else { return }
        let storageRef = Storage.storage().reference()

        // Reference to an image file in Firebase Storage
        let reference = storageRef.child("\(user_email)").child("/top").child("1.jpg")

        // UIImageView in your ViewController
        let imageView: UIImageView = self.imageView

        // Placeholder image
        let placeholderImage = UIImage(named: "placeholder.jpg")
        //UploadViewController.Clothing.top_images.append(<#UIImage#>)

        // Load the image using SDWebImage
        imageView.sd_setImage(with: reference, placeholderImage: placeholderImage)


        // this is the code for the rawImage portion I described above
        reference.getData(maxSize: 1 * 1024 * 1024) { data, error in
            if let error = error {
                print("Error \(error)")
            } else {
                let picture = UIImage(data: data!)
                UploadViewController.Clothing.top_images.append(picture!)
            }
        }

        // loading the image to the rawImage imageview
            rawImage.image = UploadViewController.Clothing.top_images[0]

    }
}

Answer 1

如果您已经使用 SDWebImage 加载图像，则还可以将图像附加到 UIImage 数组中。

只需将 SDWebImage 与这样的完整块一起使用

x = 0
if(x < canvas.width - 50){
     x+=7
}
console.log(x); // x = 7

Answer 2

您已经忽略了强制展开可选选项，我建议您删除!用法以避免崩溃，请改用以下命令

reference.getData(maxSize: 1 * 1024 * 1024) { data, error in
    guard let data = data else {
        print(error?.localizedDescription ?? "Check remote url or service")
        return
    }

    if let picture = UIImage(data: data) {
        UploadViewController.Clothing.top_images.append(picture)
    } else {
        print("Invalid image data\n\(String(data: data, encoding: .utf8))")
    }
}

或在声明安全的情况下关注

if error == nil && data != nil, let picture = UIImage(data: data!) {
    UploadViewController.Clothing.top_images.append(picture)
}

您也可以尝试使用不带斜杠的路径，如下所示：

let reference = storageRef.child("\(user_email)/top/1.jpg")

如何将从Firebase导出并转换为UIImage的数据存储到UIImage数组？

2 个答案: