.isImage

🌀 URL

📗 參考：Swift Playgrounds ⟩ Image Gallery (Data Model: Gathering Image URLs)

import Foundation

extension URL {
    var isImage: Bool {
        ["jpg", "jpeg", "png", "gif", "heic"]
            .contains(self.pathExtension)
    }
}

📗 參考

• Swift Playgrounds ⟩ Image Gallery (Data Model: Gathering Image URLs)

📘 手冊

• Foundation ⟩ Numbers, Data, and Basic Values ⟩

  • URL ⟩ pathExtension