objective c to swift blocks - objective-c

Question

I'm having trouble converting this objective C to swift blocks
you can see here Code on Github, but i don't have any background in objective C, so i don't really understand this block, here is the code
- (LinkedStringTapHandler)exampleHandlerWithTitle:(NSString *)title
{
LinkedStringTapHandler exampleHandler = ^(NSString *linkedString) {
UIAlertView *alert = [[UIAlertView alloc]initWithTitle:title
message:[NSString stringWithFormat:#"Handle tap in linked string '%#'",linkedString]
delegate:nil
cancelButtonTitle:#"Dismiss"
otherButtonTitles:nil, nil];
[alert show];
};
return exampleHandler;
}
you can see this code on github https://github.com/evilBird/HBVLinkedTextView/blob/master/HBVLinkedTextViewExample/HBVLinkedTextViewExample/ViewController.m , take a look at that code, Im trying to use it in swift using bridging header. Everything i converted but this line i dont understand.
LinkedStringTapHandler exampleHandler = ^(NSString *linkedString)
this is what i have done so far
func exampleHandlerWithTitler(title:NSString)->LinkedStringTapHandler {
exampleHandler: LinkedStringTapHandler = (linkedString:NSString) -> () {
// alert view code here
}
return exampleHandler (ERROR here Use of unresolved identifier exampleHandler)
}

Answer 1

Where Objective-C has blocks, Swift has functions. So it's just a matter of knowing how to read Objective-C block syntax - not easy, I know:
^(NSString *linkedString)
That means: "This is a block taking an NSString parameter (and returning nothing)." So you want to supply here a Swift function that takes an NSString parameter (and returns nothing).
In other words, the definition of LinkedStringTapHandler is equivalent to saying this in Swift:
typealias LinkedStringTapHandler = (linkedString:NSString) -> ()
So in your code you would form a function of that type and return it:
func f(linkedString:NSString) -> () {
// do stuff
}
return f
You could do the same thing with an anonymous function but that's neither here nor there, really.

Answer 2

finally this is working
func exampleHandlerWithTitler(title:NSString)->LinkedStringTapHandler {
let exampleHandler: LinkedStringTapHandler = {(linkedString:String) in {
// alert view code here
}
return exampleHandler
}