How can I control error level of NSLog messages on iOS?

Question

I observed the NSLog() does log all my messages with error level Warning but when I look to the console I see other messages with different error levels like Info, or `Error.

How can I control the error level of my messages?

Answer 1

Another possible option you could use as a replacement for NSLog is OSLog, it comes with some nice advantages, is flexible and easy to use. For using it create an OSLog extension to set some configurations:

import Foundation
import os.log

extension OSLog {
    private static var subsystem = Bundle.main.bundleIdentifier!

    /// Defining my custom log objects
    /// Log View Cycles.
    static let viewCycle = OSLog(subsystem: subsystem, category: "View Cycle")
    /// Log User Actions.
    static let userAction = OSLog(subsystem: subsystem, category: "User Action")
}

Then just use it whenever you want in your View Controllers:

 import UIKit
 import os.log

 class MenuViewController: UIViewController {

   @IBAction func didTapMenu(_ sender: UIBarButtonItem) {
      os_log("Did tap %@ option", log: .userAction, type: .info, "Some UI element")
   }
}

As you can see you can specify a log level as a type parameter and define your own custom log objects.

Console Output: 2019-12-11 10:21:44.788204-0300 ProjectName[70193:3015307] [User Action] Did tap Some UI element option