For example,
alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Default, handler:{ (x:UIAlertAction) in
...
will give a "Cannot find initializer with..." error.
But if I say UIAlertAction! or UIAlertAction? instead of just UIAlertAction, it works. Why is this?
The types of these variables are all declared already in the Cocoa API. You must match them. A thing and an Optional wrapping that thing are not a match; they are two completely different types.
On the other hand, when types are known you can just omit them. So the easiest thing is for you to change x:UIAlertAction to simple x or even _.
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