将字典对象从Obj-C传递到Swift

Question

In my obj-C code base, I'm calling passing a NSDictionary object to a Swift class:

AppDelegate.m

-(void)application:(UIApplication *) application didReceiveRemoteNotification: (NSDictionary *)dictionaryInfo {
    ...
    [[SwiftClass sharedInfo] setInfo:dictionaryInfo];
    ...
}

SwiftClass.swift

class SwiftClass: NSObject {

    static let sharedInfo = MYQNotificationInfo()

    func setInfo(notification:Dictionary<String,String>) -> Void {
         // runtime error happens before this line
    }

}

The app compiles but when I receive a push notification, it crashes. Using Xcode debugger, I set a breakpoint at the setInfo method within AppDelegate and can see that the push notification is received. But, once I step into the setInfo method, then the app crashes, never actually making it into the function. Thus, I suspect that the I'm not setting the parameters within setInfo properly.

Is this an issue where I'm not passing in the Dictionary object in properly?

Answer 1

NSDictionary can only be passed to swift as [NSObject: AnyObject] since an NSDictionary can contain objects of any type. Try this:

func setInfo(notification:Dictionary<NSObject,AnyObject>) -> Void {

}

Once you receive the dictionary you can retreive a value for a key and downcast that value to it's declared type when needed