CODEWITHSUNDEEP
iosswiftnulluiimageviewuiimage
Tim Larsen
Tim Larsen

Reputation: 13

Setting UIImageView.image with valid UIImage creates "nil" error in swift

I am trying to set the image property on a UIImageView. When I use a UIImage to set the .image property it throws this error every time:

"unexpectedly found nil while unwrapping an Optional value"

The problem is that my UIImage is not nil.

Here is the code where I am setting the UIImage

func setPhotosForNewsItem(photoArray:[Photo]) {
    println("Image Count: " + String(photoArray.count))
    var image:UIImage = photoArray[0].photo
    println(image.description)
    self.newsImage.image = image
}

Here is the console output:

Image Count: 2 UIImage: 0x7fdd93c5cdd0, {1115, 1115} fatal error: unexpectedly found nil while unwrapping an Optional value (lldb)

I am able to use the Quick Look tool in xCode on my supposedly nil UIImage and see the photo that I am trying to use. Why would I be throwing a nil error when my UIImage is clearly not nil?

UPDATE::

It seems that I am not properly storing the UIImage in my array. Here is where I download my images and store them to my array for unpacking later.

var relatedPhotos:[PFObject] = relations as! [PFObject]
                            //println(relations!)
                            var photoArray:[Photo] = [Photo]()

                            for photo in relatedPhotos {
                                var newPhoto = Photo()
                                var photoFile:PFFile = photo.objectForKey("photo") as! PFFile
                                newPhoto.object = photo
                                newPhoto.objectID = photo.objectId!
    photoFile.getDataInBackgroundWithBlock({(imageData: NSData?, error: NSError?) -> Void in
                                        if (error == nil) {

                                            newPhoto.photo = UIImage(data:imageData!)!
                                            //println(newPhoto.photo)
                                            photoArray.append(newPhoto)

                                            if photoArray.count == relatedPhotos.count {

                                                if newObject is FieldReport {
                                                    var report = newObject as! FieldReport
                                                    report.photos = photoArray
                                                    updatedReports.append(report)
                                                    //println("Report Count 1: " + String(updatedReports.count))
                                                }
                                                else {
                                                    var report = newObject as! Feature
                                                    report.photos = photoArray
                                                    updatedReports.append(report)
                                                }

                                                if updatedReports.count == objects.count {


                                                    self.delegate?.fieldReports(updatedReports)
                                                }
                                            }

                                        }
                                    })
}

I know that this works to download and display the photo as I have just used it successfully to do so. To me that means I am not storing the UIImage properly. Is there a different way I should be storing these image files?

Upvotes: 1

Views: 4087

Answers (1)

Doro
Doro

Reputation: 2413

You can prevent the crash from happening by safely unwrapping

func setPhotosForNewsItem(photoArray:[Photo]) {
    println("Image Count: " + String(photoArray.count))
   if  var image:UIImage = photoArray[0].photo
   {
       println(image.description)
       self.newsImage.image = image
    }
}

Setup breakpoint and check what's wrong

EDIT:

The only thing i can purpose - check what happens here:

newPhoto.photo = UIImage(data:imageData!)!

seems like it's the main reason of all problems. check type of imageData, try to convert it to image via, for example UIImage(CGImage: <#CGImage!#>). You need to figure out how to deal with this image.

Upvotes: 0

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