iOS - Retrieve and display an image from Parse in UIImageView (Swift 1.2 Error)

Question

I have previously been retrieving an image form my Parse backend to display in my app inside a UIImageView using the following lines of code:

let userPicture         


        

Answer 1

PFUser.currentUser() returns optional type (Self?). So you should unwrap return value to access element by subscript.

PFUser.currentUser()?["picture"]

And the value got by subscript is also optional type. So you should use optional binding to cast the value because type casting may fail.

if let userPicture = PFUser.currentUser()?["picture"] as? PFFile {

And parameters of the result block of getDataInBackgroundWithBlock() method are both optional type (NSData? and NSError?). So you should specify optional type for the parameters, instead NSData and NSError.

userPicture.getDataInBackgroundWithBlock { (imageData: NSData?, error: NSError?) -> Void in

The code modified the all above problems is below:

if let userPicture = PFUser.currentUser()?["picture"] as? PFFile {
    userPicture.getDataInBackgroundWithBlock { (imageData: NSData?, error: NSError?) -> Void in
        if (error == nil) {
            self.dpImage.image = UIImage(data:imageData)
        }
    }
}