如何在选择器参数 Swift 后添加 function 参数

Question

I am writing a function with a definition that looks like this

@objc public func artOptionsTapped(_ barButtonItem: UIBarButtonItem, imageReferences: [StorageReference]?)

I am wondering what the proper way to call this function is if I want to pass in a list called images as the imageReferences parameter. I tried to call it like this:

#selector(artOptionsTapped(:_, imageReferences: images))

But that's causing me an error. Thanks!

Answer 1

Assuming that I'm interpreting your question correctly, you want a selector to artOptionsTapped where the imageReferences parameter is always images . This is partial function application , and is not currently natively supported in Swift. To get the equivalent functionality, try this:

let images = getImages() // however you get the images
let closure = { (barButtonItem: UIBarButtonItem) in
    artOptionsTapped(barButtonItem, images)
}
#selector(closure(_:))

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(fair warning, this may not work — I haven't tried it myself and I may not understand the context you're trying this in, but I figured it was worth a shot)