如何从图像路径获取文件名

Question

我正在尝试从图像路径URL获取文件名，但出现类似“无法将'URL'类型的值转换为强制类型'NSString'的错误”之类的错误，有人可以帮助我将其转换为NSstring。谢谢！

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

如果存在本机等效项，则根本不要在Swift中使用NS类。

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并且请考虑以下警告

可变的“图像”从未改变。 考虑更改为“ let”常量