Cannot invoke 'indexOf' with an argument list of type '(ChecklistItem)'

Question

When I am writing code for finding an item from the array with the use of indexOf it shows me the above stated error. Here is my code:-

func addItemViewContr         


        

Answer 1

In Swift 4 and Swift 3, update your Data Model to conform to "Equatable" protocol, and implement the lhs=rhs method , only then you can use ".index(of:...)", because you are comparing your custom object

Eg:
class Photo : Equatable{
    var imageURL: URL?
    init(imageURL: URL){
        self.imageURL = imageURL
    }

    static func == (lhs: Photo, rhs: Photo) -> Bool{
        return lhs.imageURL == rhs.imageURL
    }
}

Usage:

let index = self.photos.index(of: aPhoto)