AppInfo Swift - Util to get app infos like build / version number etc

AppInfo.swift

//
//  AppInfo.swift
//  This is an Util to get app infos like build / version number etc
//  Swift 3.0
//  Xcode 8.0
//

import Foundation
import AVFoundation

class AppInfo {
  
  /// Returns DEBUG or RELEASE info with version and build number
  static func buildInfo() -> String {
    #if DEBUG
      return "DEBUG" + versionInfo()
    #else
      return "RELEASE" + versionInfo()
    #endif
  }
  
  /// Returns Version Info - Vesrion Number & Build Number
  static func versionInfo() -> String {
    return " v " + self.versionString() + " b " + buildString()
  }
  
  static func versionString() -> String {
    return Bundle.main.infoDictionary?["CFBundleShortVersionString"] as! String
  }
  
  static func buildString() -> String {
    return Bundle.main.infoDictionary?["CFBundleVersion"] as! String
  }
  
  static func appName() -> String {
    return Bundle.main.infoDictionary?["CFBundleName"] as! String
  }
  
  static func apiVersionNumber() -> String {
    return Bundle.main.infoDictionary?["API_VERSION"] as! String
  }
  
  static var outputVolume: Float {
    return AVAudioSession.sharedInstance().outputVolume
  }
  
  static var outputVolDB: Float {
    return 20.0 * log10f(AppInfo.outputVolume + FLT_MIN)
  }

}