NSData contentsOfURL Returns Nil?

Question

I have the following code

import Foundation

let url = NSURL(string: copiedURL)
let data = NSData(contentsOfURL: url!)
print("\(data)")
let image2 = UIImage(data: data!)

When I build and run, I get the following error fatal error: unexpectedly found nil while unwrapping an Optional value referring to

let image2 = UIImage(data: data!)

I tried to modify my Info.plist with the following

<key>NSAppTransportSecurity</key>
<dict>
    <key>NSAllowsArbitraryLoads</key>
    <true/>
</dict>

But the error is still there. Is there any more possible solutions I can try?

We need to see the code before this, specifically what `copiedURL` is and how you arrived at it. Are you trying to load an image that's on the local file on the system or is it on a network? — NSGod, Jun 17 '16 at 18:49

score 0 · Accepted Answer · edited May 23 '17 at 12:16

Couple of possibilities here.

The copiedURL is not being properly converted to a NSURL
The NSURL is not being converted to NSData
The image is unable to load the data

Try the following:

if let url = NSURL(string: copiedURL) {
    print(url)
    if let data = NSData(contentsOfURL: url) {
        print(data)
        let image2 = UIImage(data: data)
    }
}

It's almost never a good idea to force unwrap something (!), instead use guard or if let to unwrap and thus be able to handle the nil condition.

Refer to: Loading/Downloading image from URL on Swift for how to properly download images.

score 0 · Answer 2 · answered Jun 17 '16 at 18:47

Try the following code:

if let url = NSURL(string: copiedURL) {
   if let data = NSData(contentsOfURL: url) {
   print("\(data)")
   let image2 = UIImage(data: data)
   }
}

If copiedURL has valid image you will get it, otherwise atleast your app will not crash.

NSData contentsOfURL Returns Nil?

2 Answers2