ios - 无法打开文件 “”，因为您没有查看它的权限

Question

我正在将一个文件下载到一个文件夹中，我正在验证该文件确实存在于代码中，但我收到了上述错误。谁能帮我弄清楚为什么我没有权限读取这个文件？

let documentsURL = NSSearchPathForDirectoriesInDomains
(.DocumentDirectory, .UserDomainMask, true)[0]

let checkValidation = NSFileManager.defaultManager()

if (checkValidation.fileExistsAtPath(documentsURL))
{
    print("FILE AVAILABLE");
}
else
{
    print("FILE NOT AVAILABLE");
}

print(documentsURL)

do{
    let data = try String(contentsOfFile: documentsURL as String,
                          encoding: NSASCIIStringEncoding)
    print(data)
    
}
catch let error { print(error) }

Error Domain=NSCocoaErrorDomain Code=257 "The file “Documents” couldn’t be opened because you don’t have permission to view it." UserInfo={NSFilePath=/var/mobile/Containers/Data/Application/7FA4D6A9-2149-4053-BF08-22E94A00AE34/Documents, NSUnderlyingError=0x137807200 {Error Domain=NSPOSIXErrorDomain Code=13 "Permission denied"}}

Answer 1

尝试

fileURL.startAccessingSecurityScopedResource()
//...
fileURL.stopAccessingSecurityScopedResource()