Objective-C completion block in Swift errors

Question

I'm trying to run a method from an Objective-C class with a completion block in a Swift class but I'm having some troubles.

Obj-C code:

typedef void(^completionBlock)(NSDictionary *);

+ (void)getVersionsFromAPI:(completionBlock)sendData
{
  NSDictionary *dict = [[NSDictionary alloc] init];
  // Do stuff
  sendData(dict);
}

Swift code:

API.getVersionsFromAPI { (ver : NSDictionary) -> Void in
    self.version = ver.mutableCopy() as NSMutableDictionary;
}

I'm getting an error that says '[NSObject : AnyObject]!' is not a subtype of 'NSDictionary' on the first line.

Have you tried using ver : NSDictionary! or ver : NSDictionary?? — Antonio
– Antonio, Commented Dec 19, 2014 at 15:16
Yep, that then says '[NSObject : AnyObject]!' is not identical to 'NSDictionary' when using ! or the first error with ?. — r_t
– r_t, Commented Dec 19, 2014 at 15:18

Antonio · Accepted Answer · 2014-12-19 15:29:18Z

2

I presume that the version property is an optional NSMutableDictionary:

var version: NSMutableDictionary?

If that's correct, than you should fix your code as follows:

API.getVersionsFromAPI { (ver: [NSObject: AnyObject]?) in
    if let ver = ver {
        self.version = NSMutableDictionary(dictionary: ver)
    }
}

I've successfully compiled this code in Xcode 6.1.1

answered Dec 19, 2014 at 15:29

Antonio

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