ios - 如何获取 pdf 的大小(以字节为单位)并将其分配给 Data 变量？

Question

我已经定义了 documentPicker，如下所示，但我现在想要获取上传的 pdf 的大小(以字节为单位)。

func documentPicker(_ controller: UIDocumentPickerViewController, didPickDocumentsAt urls: [URL]){
self.parent.docData = // here the assigned value should be the size of the pdf

}

例如，它在图像如下的情况下工作:

func imagePickerController(_ picker: UIImagePickerController, didFinishPickingMediaWithInfo info: [UIImagePickerController.InfoKey : Any]) {
            let image = info[.originalImage] as! UIImage
            let picdata = image.jpegData(compressionQuality: 0.25)
            self.parent.picData = picdata!
            self.parent.picker.toggle()
        }

Answer 1

让 bcf = ByteCountFormatter()
bcf.allowedUnits = [.useBytes]
bcf.countStyle = .file
让 string = bcf.string(fromByteCount: Int64(picdata.count))根据[.useBytes]此字段中的要求更改大小单位。希望这可以帮助。