Question

我正在开发一个iOS应用，该应用将图像列表上传到Firebase存储，我需要在uicollectionview的每个单元格中放置一个进度视图（显示数据源中的每个图像），以指示将该图像上传到Firebase存储的百分比

我尝试此代码：

func Upload(imageView: UIImageView)
    {

        // Data in memory
        var data = Data()
        data = UIImageJPEGRepresentation(self.pickedImage, 0.8)!

        // Create a root reference
        let storageRef = Storage.storage().reference()
        let imageName = NSUUID().uuidString

        // Create a reference to the file you want to upload
        let imageRef = storageRef.child("images/\(imageName).jpg")

        // Upload the file to the path "images/rivers.jpg"
        let uploadTask = imageRef.putData(data, metadata: nil) { (metadata, error) in
            guard let metadata = metadata else {
                // Uh-oh, an error occurred!
                return
            }
        }

        let observer = uploadTask.observe(.progress) { snapshot in
            print("snapshot.progress",snapshot.progress) 
        }

        uploadTask.observe(.progress) { snapshot in
            let percentComplete = 100.0 * Double(snapshot.progress!.completedUnitCount)
                / Double(snapshot.progress!.totalUnitCount)
            print("percentComplete",percentComplete)
            let placeholderImage = UIImage(named: "la")
            imageView.sd_addActivityIndicator()
            imageView.sd_showActivityIndicatorView()
            imageView.sd_setImage(with: imageRef, placeholderImage: placeholderImage)
        }

        uploadTask.observe(.success) { snapshot in
           self.url = imageName
            print(imageName)
            print("success")
            imageView.sd_removeActivityIndicator()
        }
         uploadTask.observe(.failure) { snapshot in
            print("Failuer")
        }
    }

和：

arrayOfImages?[(arrayOfImages?.count)! - 1]?.Upload(imageView: cell.workImage)

但是我无法获得它，因为在UICollectionView中单元的重用，我该如何获得它？

Answer 1

1-创建一个类并将此代码粘贴到函数中

2-在该类中创建progress属性，并在进度完成和图像的另一个属性中定期更新

3-在类中创建一个实例数组，并使用图片对其进行初始化，然后开始上传

4-在cellForRowAt内获取每个索引的当前进度值，这是避免单元重复使用和上载要上载或当前上载图像的方法

//

会是这样

class Upload {

    var currentState:State = .none

    var progress:Float = 0

    var img:UIImage

    init(image:UIImage) {

        img = image


    }

    func start () {

        currentState = .uploading

        ///

        let observer = uploadTask.observe(.progress) { snapshot in
            self.progress = snapshot.progress
        }

        ///


         uploadTask.observe(.success) { snapshot in
            currentState = .uploaded
         }

        //

    }


}

enum State {

    case uploading,uploaded,none
}

//

var arr = [Upload]()

for i in 0..<numberOfImages {

    let img = UIImage(named: "\(i).png") // or get it anyWay

    let up = Upload(image: img)

    up.start() // start it in cellForRowAt if item state is none

    arr.append(up)

}

iOS：在uicollectionview中添加UIProgressView以显示上载到firbase存储的上载百分比

1 个答案: