iOS 9 read file permission

Question

In iOS 9+ I get a nil on any attempt to read from file. The file in this case is a image file path.
using

NSData(contentsOfFile: stringpath, options: NSD         


        

Answer 1

In my case, the file permissions were too restrictive, so I couldn't read the file.

Adding read+write permissions to the file before accessing it solved it.

do {
    // Retrieve any existing attributes
    var attrs = try FileManager.default.attributesOfItem(atPath: stringpath)
    let existing = (attrs as NSDictionary).filePosixPermissions()
    // Set the read+write value in the attributes dict
    attrs[.posixPermissions] = existing | 0b110000000
    // Update attributes
    try FileManager.default.setAttributes(attrs, ofItemAtPath: stringpath)

    // Read data from file
    let data = try Data(contentsOf: URL(fileURLWithPath: stringpath, isDirectory: false), options: .uncached)
    print("success: \(data.count)")
} catch {
    print(error)
}

That works if you're in a folder with enough permissions, as you can change the files permissions even if you didn't had read permission on the file previously. This solution was applied at https://github.com/ZipArchive/ZipArchive/issues/293.