Saving custom Swift class with NSCoding to UserDefaults

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In Swift 4 or higher, Use Codable.

In your case, use following code.

class Blog: Codable {
   var blogName: String?
}

Now create its object. For example:

var blog = Blog()
blog.blogName = "My Blog"

Now encode it like this:

if let encoded = try? JSONEncoder().encode(blog) {
    UserDefaults.standard.set(encoded, forKey: "blog")
}

and decode it like this:

if let blogData = UserDefaults.standard.data(forKey: "blog"),
    let blog = try? JSONDecoder().decode(Blog.self, from: blogData) {
}

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