Open Radar

 
Summary:
The new set of APIs related to drag and drop forces the use of force unwraps and force casts in Swift.

Steps to Reproduce:
// itemProvider is of type NSItemProvider
itemProvider.loadObject(ofClass: UIImage.self) { object, error
…
}

Expected Results:
object is of type UIImage

Actual Results:
Object needs to be casted to UIImage. Eg:
let image = object as! UIImage

Version:
11.0

Notes:
Proposed implementation:

extension NSItemProvider {

    func genericLoadObject<T>(ofClass aClass: T.Type, completionHandler: @escaping (T?, Error?) -> Swift.Void)
    -> Progress where T: NSItemProviderReading {
        return loadObject(ofClass: aClass) { (item, error) in
            if let item = item as? T {
                completionHandler(item, error)
            } else {
                completionHandler(nil, error)
            }
        }
    }
}