How to get build number and version in code

1. Copy this script into a new run script phase under (Select the Blue Project Icon > Build Phases)

2. Click the ➕ button

3. Paste the script below

#!/bin/bash
# Auto Increment Version Script
buildPlist=$INFOPLIST_FILE
echo $buildPlist
CFSVString=$(/usr/libexec/PlistBuddy -c "Print CFBundleShortVersionString" "$buildPlist")
CFBundleVersion=$(/usr/libexec/PlistBuddy -c "Print CFBundleVersion" "$buildPlist")
BUILD_NR=${CFBundleVersion##*.}
    BUILD_NR=$(($BUILD_NR + 1))
    #echo $BUILD_NR
    CFBundleVersion=$CFSVString".0."$BUILD_NR
    #echo $CFBundleVersion
    /usr/libexec/PlistBuddy  -c "Set :CFBundleVersion $CFBundleVersion" "$buildPlist"

I add this extension to UIApplication

extension UIApplication {
    struct Constants {
        static let CFBundleShortVersionString = "CFBundleShortVersionString"
    }
    class func appVersion() -> String {
        return NSBundle.mainBundle().objectForInfoDictionaryKey(Constants.CFBundleShortVersionString) as! String
    }
  
    class func appBuild() -> String {
        return NSBundle.mainBundle().objectForInfoDictionaryKey(kCFBundleVersionKey as String) as! String
    }
  
    class func versionBuild() -> String {
        let version = appVersion(), build = appBuild()
      
        return version == build ? "v\(version)" : "v\(version)(\(build))"
    }
}

Then use it on a label like so:

  @IBOutlet weak var appVersionLabel: UILabel! { didSet {
        appVersionLabel.text = "Build Version: \(UIApplication.versionBuild())"
        }
    }

This is for incrementing RN xcode project versions automatically : agvtool next-version -all && xcrun agvtool new-marketing-version \"1.$(agvtool what-version | sed -n 2p |tr -d ' ')\"

or in nodejs

"scripts":{ "ios-next-version":"cd ios && agvtool next-version -all && xcrun agvtool new-marketing-version \"1.$(agvtool what-version | sed -n 2p |tr -d ' ')\" && cd .." }