ios - 如何从图像路径中获取文件名

Question

我正在尝试从图像 pathurl 获取文件名
但我收到一个错误，例如“无法将'URL'类型的值转换为强制类型'NSString'”谁能帮我转换为NSstring。提前致谢

if var imgUrl = info[UIImagePickerController.InfoKey.imageURL] as? URL{
    let imgName = imgUrl.lastPathComponent
    let documentDirectory = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first
    let localPath = documentDirectory?.appending(imgName)

    var image = info[UIImagePickerController.InfoKey.originalImage] as! UIImage
    let data = image.pngData()! as NSData
    data.write(toFile: localPath!, atomically: true)
    //let imageData = NSData(contentsOfFile: localPath!)!
    let photoURL = URL.init(fileURLWithPath: localPath!)//NSURL(fileURLWithPath: localPath!)
    print(photoURL)

    let filename = (photoURL as NSString).lastPathComponent
    // pdfURL is your file url
    let fileExtention = (filename as NSString).pathExtension  // get your file extension
    let pathPrefix = (filename as NSString).deletingPathExtension
    img.image = image

Answer 1

(在 Swift 中)所有用于路径操作的方法都在 URL 结构中。无需转换

let filename = photoURL.lastPathComponent
// pdfURL is your file url
let fileExtention = photoURL.pathExtension  // get your file extension
let pathPrefix = photoURL.deletingPathExtension.lastPathComponent
img.image = image

并且不要使用 NS Swift 中的类，如果有原生的等价物的话。

请考虑以下警告

Variable 'image' was never mutated; consider changing to 'let' constant