尝试将图像从iOS上传到parse.com

Question

I am trying to upload an image from an iOS app to a Parse class.

The ViewController has two buttons and an ImageView

Button 1 : Select picture from device's PhotoGallery,

ImageView (myImageView): shows the selected picture.

This part of the app is working fine.

In Parse, I have created a class called citas_servicio , with a column called foto , from type file.

Button 2 action is subirFoto :

@IBAction func subirFoto(sender: AnyObject) {
    if myImageView.image == nil {
        //image is not included alert user
        print("Image not uploaded")
     }else {
         var posts = PFObject(className: "citas_servicio")
         posts.saveInBackgroundWithBlock({(success: Bool, error: NSError?) -> Void in
             if error == nil {
                 /**success saving, Now save image.***/

                 //create an image data
                 var imageData = UIImagePNGRepresentation(self.myImageView.image!)
                 //create a parse file to store in cloud
                 var parseImageFile = PFFile(name: "uploaded_image.png", data: imageData!)
                 posts["foto"] = parseImageFile
                 posts.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
                     if error == nil {
                         //take user home
                         print("data uploaded")
                     }else {
                         print(error)
                     }
                 })
             }else {
                 print(error)
             }
         })
     }
 }

Once Button2 is clicked, a new record is created in Parse, but the Image is not added in it, and no message is printed in the console.

What is wrong in the code?

Answer 1

首先在后台保存parseImageFile，然后将其与PFObject关联并在后台保存帖子（PFObject）。我希望它能正常工作。

Answer 2

You are saving Object before setting foto in posts thats why you are getting error. First save image then set it to Object :

let posts = PFObject(className: "citas_servicio")
        //create an image data
        let imageData = UIImagePNGRepresentation(self.myImageView.image!)
        //create a parse file to store in cloud
        let parseImageFile = PFFile(name: "uploaded_image.png", data: imageData!)
        parseImageFile?.saveInBackgroundWithBlock({ (success, error) -> Void in
            if success{
                posts["foto"] = parseImageFile
                posts.saveInBackgroundWithBlock({ (success: Bool, error: NSError?) -> Void in
                    if error == nil {
                        //take user home
                        print("data uploaded")
                    }else {
                        print(error)
                    }
                })
            }
        })

Answer 3

You do not need to save the object, then save with photo again, just add to the PFObject after create it.

var posts = PFObject(className: "citas_servicio")
let imageData = UIImagePNGRepresentation(self.myImageView.image!)
let parseImageFile = PFFile(name: "uploaded_image.png", data: imageData!)
posts["foto"] = parseImageFile

After that, you can easily save the object in the background.