Swift iOS 上的文件管理器：wrong/different execute/read/write 的资源值

Question

iOS 上的文件管理器：wrong/different execute/read/write

的资源值

我正在使用以下代码获取 wrong/different 资源值。

某些目录项的“URL-方法”returns execute/read/write 的其他资源值不同于“路径方法”。例如文件夹“SystemData”：

with "URL-method": isExecutable=true, isReadable=true, isWritable=true
使用“路径方法”：isExecutableFile：true，isReadableFile：false，isWritableFile：false

这个文件夹的 PosixPermissions 给了我 755 …这是不正确的。

所以两个问题：

为什么我会根据方法得到不同的值，而哪一个是正确的？
为什么 PosixPermissions 错误？

Xcode 版本 12.4 (12D4e) 和 iOS 14.4。在真实设备上测试 (iPhone 11)

func FMTest() {
    let fM = FileManager.default
    do {
        let currentRootDirURL = try fM.url(for: .documentDirectory, in: .userDomainMask, appropriateFor: nil, create: false).resourceValues(forKeys:[.parentDirectoryURLKey]).parentDirectory!
        
        let dirItems: [URL] = try fM.contentsOfDirectory(
            at: currentRootDirURL,
            includingPropertiesForKeys:[.nameKey,.isExecutableKey,.isReadableKey,.isWritableKey]
        ) 
        
        for dirItem in dirItems {
            // "URL-method"
            let dirItemAttributes = try dirItem.resourceValues(forKeys:[.nameKey,.isExecutableKey,.isReadableKey,.isWritableKey])
            
            print("+========\nnameKey: \(String(describing: dirItemAttributes.name))")
            print("URL:")
            print("..isExecutable: \(String(describing: dirItemAttributes.isExecutable))")
            print("..isReadable: \(String(describing: dirItemAttributes.isReadable))")
            print("..isWritable: \(String(describing: dirItemAttributes.isWritable))")
            
            // "path-method"
            let exec = fM.isExecutableFile(atPath: dirItem.path)
            let read = fM.isReadableFile(atPath: dirItem.path)
            let write = fM.isWritableFile(atPath: dirItem.path)
            
            print("\nPATH:")
            print("..isExecutableFile: \(exec)")
            print("..isReadableFile: \(read)")
            print("..isWritableFile: \(write)")
            
            // try? just for avoiding "Operation not permitted" error in this example code
            if let dirItemAttributesPATH = try? fM.attributesOfItem(atPath: dirItem.path) {

                // "PosixPermission"
                let dirItemPosixPermissionsDecimal = dirItemAttributesPATH[.posixPermissions] as? NSNumber
                let dirItemPosixPermisionsOctal =  String(dirItemPosixPermissionsDecimal!.intValue, radix: 8, uppercase: false)
                print("\ndirItemPosixPermisionsOctal: \(dirItemPosixPermisionsOctal)\n+========\n")
            } else {
                print("\ndirItemPosixPermisionsOctal: - \n+========\n")
            }
        }
    } catch {
        print(error)
    }
}

Answer 1

已解决：

查看 swift.org here and here

上的答案

Swift iOS 上的文件管理器：wrong/different execute/read/write 的资源值

Swift FileManager on iOS: wrong/different resourceValues for execute/read/write

file-permissions

file-manager

swift

ios14