Fails to write proper syntax for block that uses typedef

Question

I have Objective-C code that I try to convert to Swift but failed.

typedef void (^ CDVAddressBookWorkerBlock)(
    ABAddressBookRef         addressBook,
    CDVAddressBookAccessError* error
    );

@interface CDVAddressBookHelper : NSObject
{}

- (void)createAddressBook:(CDVAddressBookWorkerBlock)workerBlock;
@end

And this is Objective-C implementation:

 CDVAddressBookHelper* abHelper = [[CDVAddressBookHelper alloc] init];
 [abHelper createAddressBook: 
       ^(ABAddressBookRef addrBook, CDVAddressBookAccessError* errorCode) 
        {
         /* ...*/
        }
 ];

How to write it in Swift?

From documentation:

{(parameters) -> (return type) in expression statements}

This is a template xCode offers:

enter image description here

This is what I tried:

var abHelper:CDVAddressBookHelper = CDVAddressBookHelper()

abHelper.createAddressBook(
        {(addrBook:ABAddressBookRef, errCode:CDVAddressBookAccessError) in

           if  addrBook == nil  {

           }
        } )

Error:

 Type 'ABAddressBook!' does not conform to protocol 'AnyObject'`

[EDIT]

Regards to: swift-closure-declaration-as-like-block-declaration post I tried to write typealias:

typealias CDVAddressBookWorkerBlock = (addrBook:ABAddressBookRef, errCode:CDVAddressBookAccessError) -> ()

What next?

How to make it work?

Thanks,

Try `(addrBook:ABAddressBook!, errCode:CDVAddressBookAccessError)` ? — Mike Pollard, Aug 29 '14 at 15:15
Check out https://developer.apple.com/library/prerelease/mac/documentation/Swift/Conceptual/BuildingCocoaApps/WorkingWithCocoaDataTypes.html — Mike Pollard, Aug 29 '14 at 15:15
@MikePollard thanks Mike, this fix did the trick, I posted the working snippets of code, please post the anser to let me upvode and delete answer from question — snaggs, Aug 29 '14 at 15:40
Are you sure it's not `addrBook:ABAddressBook?` rather than `ABAddressBookRef?` ? — Mike Pollard, Aug 29 '14 at 15:45
@MikePollard I need nil validation to send error callback to javascript. But you can write `!` — snaggs, Aug 29 '14 at 15:58
I mean `ABAddressBook` not `ABAddressBookRef` ... i.e. no `Ref` at the end... — Mike Pollard, Aug 29 '14 at 15:59
@MikePollard don't think so, its Cordova sources "CDVContacts.m" — snaggs, Aug 29 '14 at 17:26

Mike Pollard · Accepted Answer · 2014-08-29T19:45:02.223

1

Check out the docs about how to work with Cocoa and Core Foundation.

This should work:

abHelper.createAddressBook() {
    (addrBook:ABAddressBook?, errCode:CDVAddressBookAccessError!) in                

            if addrBook == nil  {

            }


    }

edited Aug 29 '14 at 19:45

answered Aug 29 '14 at 15:44

Mike Pollard

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1

You can also use trailing closure syntax to get rid of the `( )`. – jtbandes Aug 29 '14 at 19:42

Fails to write proper syntax for block that uses typedef

1 Answers1