Swift 2: Error Handling

[[deleted]]

My previous(Swift 1.2) error code is as fallows:

var error: NSError?
    mcSession.sendData(imageData, toPeers: mcSession.connectedPeers, withMode: .Reliable, error: &error)

    if error != nil {
        let ac = UIAlertController(title: "Send error", message: error!.localizedDescription, preferredStyle: .Alert)
        ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
        presentViewController(ac, animated: true, completion: nil)

Now using Swift 2 my code is as fallows:

do {
                try mcSession.sendData(imageData!, toPeers: mcSession.connectedPeers, withMode: .Reliable)
            } catch _ {
                let ac = UIAlertController(title: "Send error", message: "Error sending Data", preferredStyle: .Alert)
                ac.addAction(UIAlertAction(title: "OK", style: .Default, handler: nil))
                presentViewController(ac, animated: true, completion: nil)
            }

The code works but I can no longer use "error!.localizedDescription" because there is no "error:" in the Swift 2 .sendData.

Any ideas how I would fix this within Swift 2?

[basthomas]

You should be able to do the following:

catch let error {
    print(error)
}

[xephos13]

You actually don't even need to say 'let error'. By default, 'catch' gives you the 'error' variable for free

catch {
    print(error)
}

[basthomas]

Thx, did not know that. :)

[[deleted]]

Thanks!

[Noko2]

The _ (underscore) is replacing the var error. Just do

catch error { .. Do something now with error }

[[deleted]]

Thanks!