A UIView needs to change a warning label depending on the completion handler of a custom control:
voucherInputView.completionHandler = {[weak self] (success: Bool) -> Void in
self?.proceedButton.enabled = success
self?.warningLabel.alpha = 1.0
if success
{
self?.warningLabel.text = "Code you entered is correct"
self?.warningLabel.backgroundColor = UIColor.greenColor()
}
else
{
self?.warningLabel.text = "Code you entered is incorrect"
self?.warningLabel.backgroundColor = UIColor.orangeColor()
}
UIView.animateWithDuration(NSTimeInterval(1.0), animations:{ ()-> Void in
self?.warningLabel.alpha = 1.0
})
The final animation block shows an error in the form.
Cannot invoke 'animateWithDuration' with an argument list of type '(NSTimeInterval), animations: ()-> Void)'
If i call this somewhere outside of the completion closure it works.
The problem is that the closure is implicitly returning the result of this expression:
but the closure itself is declared as returning
Void
.Adding an explicit
return
should resolve the problem:Antonio's solution also applies with nested closures, like doing an AFNetworking request within UITableViewRowAction handler.