CODEWITHSUNDEEP
iosswiftxcodegoogle-analyticsswift3
romero-ios
romero-ios

Reputation: 1085

Cast from NSMutableDictionary? to unrelated type [AnyHashble:Any] always fails

I updated to Swift 3 and I'm using Google Analytics in my project. Originally I had this line of code working:

 tracker.send(GAIDictionaryBuilder.createScreenView().build() as [NSObject : AnyObject])

After the Swift 3 conversion tool finished, it changed it to this:

tracker?.send(GAIDictionaryBuilder.createScreenView().build() as [AnyHashable: Any])

I'm getting the error:

Cannot convert value of type NSMutableDictionary! to type [AnyHashable:Any] in coercion

I can get rid of this error by changing the line to:

tracker?.send(GAIDictionaryBuilder.createScreenView().build() as? [AnyHashable: Any])

However this gives me the warning in the title. Does anyone know why this is happening? Is this a bug in Swift 3?

Upvotes: 1

Views: 1301

Answers (2)

JMI
JMI

Reputation: 2628

I solved it by this (safer) way:

    if let eventTracker = GAIDictionaryBuilder.createScreenView().build() {
        var eventTrackerSwift: [AnyHashable: Any] = [:]
        for item in eventTracker {
            if let key = item.key as? AnyHashable {
                eventTrackerSwift[key] = item.value
            }
        }
        tracker.send(eventTrackerSwift)
    }

Upvotes: 0

OOPer
OOPer

Reputation: 47876

I'm not sure if Swift Team (or Apple?) thinks that is a bug. But in fact, Swift 3 runtime can convert value of type NSMutableDictionary! to type [AnyHashable:Any] using as!.

To suppress the warning, please try this:

tracker?.send(GAIDictionaryBuilder.createScreenView().build() as NSDictionary as! [AnyHashable : Any])

Upvotes: 2

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