How to download image from backendless in swift

iOS
1

Hello
I have implemented backendless image uploading and downloading function in my app.

Uploading function is working well.

But, downloading function don’t works.

So I have searched all.

I found that must be set permissions for downloading image using FileService in backendless.

But, I can’t set permission.

Please see this code snippet.

Screenshot_2
Screenshot_21919×1059 218 KB

Please give me best solution.
Best regards!
Filip Tasev

2

Hi Filip
Not sure, I’m not iOS developer but according to example in our docs https://backendless.com/docs/ios/doc.html#file_permissions_api
you should use “grantForUser” method instead of “grant”

3

I am using swift 4.0 in my iOS app.

There are no such method now.

4

Screenshot_3
Screenshot_31914×1060 287 KB

5

What problem do you get when you try downloading? Can you provide a sample URL for which you need to download the file?

6

Hello Filip,

The grant methods signatures have been changed in v5 and don’t return anything in response block.
Here is the example:

func grantAccess() {
        let userId = // your user's objectId here
        let url = // your url here
        
        Backendless.sharedInstance()?.file.permissions.grant(forUser: userId, url: url, operation: FILE_READ, response: {
            print("ACCESS GRANTED")
        }, error: { fault in
            print("ERROR: \(fault!)")
        })
    }

And you can use this async method to download image from Backendless:

func downloadImage(imageURL: String) {
    DispatchQueue.global().async {
        let data = NSData.init(contentsOf: NSURL.init(string: imageURL) as! URL)
        DispatchQueue.main.async {
            let image = UIImage.init(data: data as! Data)
            // ...
        }
    }
}

Regards,
Olga