将 NSArray 从 Objc 传递到 Swift 库

Question

im trying to work with the following pods file in an objective c project:

https://cocoapods.org/pods/iOSDropDown

I've modified the coco file to ensure all attributes are public and have the @objc tag

However, I am attempting to perform the following Swift function in Objective c and I continue to receive the following error messages:

Swift Code Im trying to execute in objective c

dropDown.optionArray = ["Option 1", "Option 2", "Option 3"]

The objc code

NSArray * stringArray = @[@"Option 1", @"Option 2", @"Option 3"];
[_dropDown setOptionArray: stringArray];

And I continue to get the following error:

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason: '-[iOSDropDown.DropDown setOptionArray:]: unrecognized selector sent to instance 0x7f8a90048800'

I understand that NSArray is a coco specific object that should transfer between swift and objc but im not sure why I am unable to set the optionArray property without crashing. Any help would be appreciated.

Answer 1

It turns out that the swift object was of an array and not an NSArray. My solution to this was to create a helper variable in swift that takes in an NSArray and sets the optionArray var within swift:

@IBInspectable public var arraySetter = NSArray() {
    didSet{
        let objCArray = NSMutableArray(array: self.arraySetter)

        if let swiftArray = objCArray as NSArray as? [String] {
            // Use swiftArray here
            self.optionArray = swiftArray
        }
    }
}