ios - 如何分离这两个功能？

Question

现在，当我点击选择图片操作时，我选择了一张图片，一旦图片选择器关闭，它就会直接进入数据库。如何使它具有两种不同的功能，以便一个按钮选择一张图片，另一个按钮上传它？

@IBAction func pickImage(_ sender: Any) {


    let image = UIImagePickerController()
    image.delegate = self
    image.sourceType = UIImagePickerControllerSourceType.photoLibrary

    image.allowsEditing = false

    self.present(image, animated: true)
    {
        //after its completed
    }


@objc(imagePickerController:didFinishPickingMediaWithInfo:) func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any])
{
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage
    {
        myImageView.image = image

    }
    else
    {
        //error
    }

    self.dismiss(animated: true, completion: nil)


    let storageRef = Storage.storage().reference().child("images/\(NSUUID().uuidString)/image.png")
    if let uploadData = UIImagePNGRepresentation(self.myImageView.image!){

        storageRef.putData(uploadData, metadata: nil, completion:
            {
                (metadata, error) in
                if error != nil {
                    print("error")
                    return
                }

                else {

                    let downloadURL = metadata?.downloadURL()?.absoluteString
                    self.ref?.child("Posts").childByAutoId().setValue(["Title": self.titleText.text,"Article": self.mainText.text, "Author": self.authorText.text, "Date": self.dateText.text,  "Download URL": (downloadURL)])

             }                
        }                  
        )
    }

Answer 1

从您当前的代码看来，您已经在 pickImage 按钮操作中添加了 UIImagePickerController 的委托(delegate)方法，这是错误的委托(delegate)方法，也应添加为您的其他类实例方法意味着它必须在 pickImage 按钮之外。

@IBAction func pickImage(_ sender: Any) {

    let image = UIImagePickerController()
    image.delegate = self
    image.sourceType = UIImagePickerControllerSourceType.photoLibrary
    image.allowsEditing = false

    self.present(image, animated: true)
}

//Add didFinishPickingMediaWithInfo here
func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [String : Any]) {
    if let image = info[UIImagePickerControllerOriginalImage] as? UIImage {
        myImageView.image = image            
    }
    else {
        //error
    }        
    self.dismiss(animated: true, completion: nil)
}

现在添加新的按钮操作 uploadImage 并添加 FIRStorage 的代码。之后只需将此操作与您的上传按钮绑定(bind)即可。

@IBAction func uploadImage(_ sender: Any) {

    let storageRef = Storage.storage().reference().child("images/\(NSUUID().uuidString)/image.png")
    if let uploadData = UIImagePNGRepresentation(self.myImageView.image!){

        storageRef.putData(uploadData, metadata: nil, completion: { (metadata, error) in
            if error != nil {
                print("error")
                return
            }                        
            else {                     
                let downloadURL = metadata?.downloadURL()?.absoluteString
                self.ref?.child("Posts").childByAutoId().setValue(["Title": self.titleText.text,"Article": self.mainText.text, "Author": self.authorText.text, "Date": self.dateText.text,  "Download URL": (downloadURL)])                        
            }
        })
    }
}