• 可以直接通過 URL 的屬性獲取沙盒路徑的 URL，不需要再借助于FileManager.default.url。
• URL 的appendingPathComponent()方法即將被廢棄，建議使用新方法append(path:directoryHint:)與appending(path:directoryHint:)。

import UIKit

class ViewController: UIViewController {
    override func viewDidLoad() {
        super.viewDidLoad()

        // Home目錄
        let homeDirectory = URL.homeDirectory
        print(homeDirectory)

        // Documents目錄
        let documentsURL = URL.documentsDirectory
        print(documentsURL)

        // Library目錄
        var libraryDirectory = URL.libraryDirectory
        // append()：直接在libraryDirectory進行拼接
        // directoryHint：是否應該執(zhí)行文件系統(tǒng)檢查，以確定路徑是否指向文件夾
        libraryDirectory.append(path: "abc", directoryHint: .inferFromPath)
        print(libraryDirectory)
        // appending()：拼接后產生新的URL，不影響原來的libraryDirectory
        let newURL = libraryDirectory.appending(path: "abc", directoryHint: .inferFromPath)
        print(newURL)

        // Caches目錄
        let cachesDirectory = URL.cachesDirectory
        print(cachesDirectory)

        // tmp目錄
        let temporaryDirectory = URL.temporaryDirectory
        print(temporaryDirectory)
    }
}