swift 中的 \ 是什么意思？

Question

I'm new to swift.

I'm pretty sure I understand what \ does in code like:

@Environment(\.managedObjectContext)

ForEach(example, id: \.id) {
//etc.
}

But what does \ actually mean? Is there some way to memorise it in your head in a meaningful way?

Answer 1

It is swift KeyPath

struct Guitar {
    let model: String
    let year: Int
}
let gibson = Guitar(model: "Gibson", year: 1990)
let path = \Guitar.model /// KeyPath<Guitar, String>

print(gibson[keyPath: path])
// prints “Gibson”

Example take and you can read more details in https://medium.com/@jllnmercier/swift-keypaths-db326852d66a

and search keywords "swift keypath"

For your snapshot

ForEach(example, id: \.id) {
//etc.
}

it means that ForEach will use example.Element.id as identifier for each iterated row.