ios - 尝试获取视频文件的大小 (kb) 时出错

Question

在我的应用程序中，显示照片中的所有视频。选择视频后，将使用 avplayer 播放该视频。但是当我尝试获取所选视频文件的大小(kb)时，它显示错误。当我尝试复制视频文件时出现同样的错误。

我已获取这些权限:

<key>NSCameraUsageDescription</key>
<string>App needs to access camera</string>
<key>NSMicrophoneUsageDescription</key>
<string>App need to access microphone</string>
<key>NSPhotoLibraryUsageDescription</key>
<string>App needs to access photos and videos</string>

获取大小的代码:

func fileSize(forURL url: Any) -> Double {

    var fileURL: URL?
    var fileSize: Double = 0.0

    if url is URL || url is String {

        if url is URL {
            fileURL = url as? URL
        }
        else {
            fileURL = URL(fileURLWithPath: url as! String)
        }
        var fileSizeValue = 0.0

        do{
            try fileSizeValue = (fileURL?.resourceValues(forKeys: [URLResourceKey.fileSizeKey]).allValues.first?.value as! Double?)!
            if fileSizeValue > 0.0 {
                fileSize = (Double(fileSizeValue) / (1024 * 1024))
            }

        } catch {

            print("file size error: \(error)")
        }
    }
    return fileSize
}

let fileSize = fileSize(forURL: selectedVideos[0] as Any)

video file url: "file:///var/mobile/Media/DCIM/107APPLE/IMG_7728.MOV"

Error: Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_7728.MOV” couldn’t be opened because you don’t have permission to view it." UserInfo={NSURL=file:///var/mobile/Media/DCIM/107APPLE/IMG_7728.MOV, NSFilePath=/var/mobile/Media/DCIM/107APPLE/IMG_7728.MOV, NSUnderlyingError=0x1c445ef90 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

编辑: 我已将 url 更改为路径。但仍然显示错误:

   let selectedFilePath = (selectedVideos[0] as! URL).path
    print("video path: \(selectedFilePath)")
    do{
        let attributes = try FileManager.default.attributesOfItem(atPath: selectedFilePath)
        let fileSize = attributes[.size] as! NSNumber
        print("file size: \(fileSize)")
    } catch {  
        print("file size error: \(error)")
    }

    let filePath = get_directory().appendingPathComponent("video\(CACurrentMediaTime()).MOV")
    print("copy to path: \(filePath.path)")
    do {
        try FileManager.default.copyItem(atPath: selectedFilePath, toPath: filePath.path)

    } catch {

        print("copy error: \(error)")
    }

错误:

video path: /var/mobile/Media/DCIM/107APPLE/IMG_7789.MOV

file size error: Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_7789.MOV” couldn’t be opened because you don’t have permission to view it." UserInfo={NSFilePath=/var/mobile/Media/DCIM/107APPLE/IMG_7789.MOV, NSUnderlyingError=0x1c0259530 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

copy to path: /var/mobile/Containers/Data/Application/5AAD29BD-489D-4737-AA98-E6131EFBA94D/Documents/addMusicToVideos/voices/video1171047.69338271.MOV

copy error: Error Domain=NSCocoaErrorDomain Code=257 "The file “IMG_7789.MOV” couldn’t be opened because you don’t have permission to view it." UserInfo={NSFilePath=/var/mobile/Media/DCIM/107APPLE/IMG_7789.MOV, NSUnderlyingError=0x1c4859830 {Error Domain=NSPOSIXErrorDomain Code=1 "Operation not permitted"}}

Answer 1

使用此 AVURLAsset 扩展程序，您可以轻松地从 URL 获取视频文件的大小。确保导入 AVFoundation 框架。代码如下:

extension AVURLAsset {
    var fileSize: Int? {
    let keys: Set<URLResourceKey> = [.totalFileSizeKey, .fileSizeKey]
    let resourceValues = try? url.resourceValues(forKeys: keys)

    return resourceValues?.fileSize ?? resourceValues?.totalFileSize
    }
} 

此扩展以 Int(字节)形式返回视频大小。您可以根据需要修改单位。要调用它，请使用以下方法:

let asset = AVURLAsset(url: urlOfYourAsset)
print(asset.fileSize ?? 0)

您没有提供足够的信息。问题出在你的文件系统上。在 iOS 中将视频文件放在哪里很重要，以及如何获取 URL，这就是问题所在。也许您的 URL 在沙箱中是不允许的。请进一步学习并阅读Apple Documentation .