Converting Swift Array to NSArray

Question

I've just started working with Swift, and I need to convert an Array to an NSArray for the purpose of writing to a plist file. Here's my code:

func saveDataToFile() {
        var a:Array = [Any]()
    for thing in self.objects {
        var dictionary = [String:Any]()
        dictionary["name"] = thing.name
        dictionary["location"] = thing.location
        a.append(dictionary)
    }
    let arr: NSArray = a
    cocoaArray.writeToFile(filePath, atomically:true);
}

When I try to convert a into the NSArray arr, I get the error "Cannot convert value of type [Any] to specified type NSArray."

Can you show the declaration of self.objects. What exactly is it? — ryantxr
– ryantxr, Commented Mar 26, 2016 at 20:01

fguchelaar · Accepted Answer · 2016-03-26 22:38:41Z

6

You're getting Cannot convert value of type [Any] to specified type NSArray, because a is of type [Any] and you cannot bridge that to an NSArray. That's because an NSArray can only contain instances of Class-types and Any can represent an instance of any type.

If you were to declare a as [AnyObject], you'll probably be fine. But then you'll also need to change the type of the dictionary to [String:AnyObject].

Or you could use an NSMutableArray, and forego the bridging entirely:

var a = NSMutableArray()
for thing in objects {
    var dictionary = [String:AnyObject]()
    dictionary["name"] = thing.name
    dictionary["location"] = thing.location
    a.addObject(dictionary)
}
a.writeToFile(filePath, atomically: true)

edited Mar 26, 2016 at 22:38

answered Mar 26, 2016 at 22:31

fguchelaar

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1 Comment

Bryan Over a year ago

I think I'll use the NSMutableArray instead, that's much simpler, and eliminates my problem. Thanks!!

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