Checking iOS Version

iOS 8 and later

Swift 3:

let minimumVersion = OperatingSystemVersion(majorVersion: 8, minorVersion: 1, patchVersion: 2)
if ProcessInfo().isOperatingSystemAtLeast(minimumVersion) {//current version is >= (8.1.2)} else {
    //current version is < (8.1.2)}

Swift 2.0 and later

if #available(iOS 9, *) {
  // iOS 9} else {
  // iOS 8 or earlier}

Compare versions

let minimumVersionString = "3.1.3"
let versionComparison =…