Compare two version strings in Swift

I have two different app version Strings (i.e. "3.0.1" and "3.0.2").

How can compare these using Swift?

Ended up having to convert my Strings to NSStrings:

if storeVersion.compare(currentVersion, options: NSStringCompareOptions.NumericSearch) == NSComparisonResult.OrderedDescending {
       println("store version is newer")
}

Swift 3

let currentVersion = "3.0.1"
let storeVersion = "3.0.2"

if storeVersion.compare(currentVersion, options: .numeric) == .orderedDescending {
    print("store version is newer")
}

You don't need to cast it as NSString. String object in Swift 3 is just powerful enough to compare versions like below.

let version = "1.0.0"
let targetVersion = "0.5.0"

version.compare(targetVersion, options: .numeric) == .orderedSame        // false
version.compare(targetVersion, options: .numeric) == .orderedAscending   // false
version.compare(targetVersion, options: .numeric) == .orderedDescending  // true

But sample above does not cover versions with extra zeros.(Ex: "1.0.0" & "1.0")

So, I've made all kinds of these extension methods in String to handle version comparison using Swift. It does consider extra zeros I said, quite simple and will work as you expected.

XCTAssertTrue(UIDevice.current.systemVersion.isVersion(lessThan: "99.0.0"))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(equalTo: UIDevice.current.systemVersion))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(greaterThan: "3.5.99"))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(lessThanOrEqualTo: "13.5.99"))
XCTAssertTrue(UIDevice.current.systemVersion.isVersion(greaterThanOrEqualTo: UIDevice.current.systemVersion))
XCTAssertTrue("0.1.1".isVersion(greaterThan: "0.1"))
XCTAssertTrue("0.1.0".isVersion(equalTo: "0.1"))
XCTAssertTrue("10.0.0".isVersion(equalTo: "10"))
XCTAssertTrue("10.0.1".isVersion(equalTo: "10.0.1"))
XCTAssertTrue("5.10.10".isVersion(lessThan: "5.11.5"))
XCTAssertTrue("1.0.0".isVersion(greaterThan: "0.99.100"))
XCTAssertTrue("0.5.3".isVersion(lessThanOrEqualTo: "1.0.0"))
XCTAssertTrue("0.5.29".isVersion(greaterThanOrEqualTo: "0.5.3"))

Just take a look and take all you want in my sample extension repository with no license to care about.

https://github.com/DragonCherry/VersionCompare

Swift 3 version

let storeVersion = "3.14.10"
let currentVersion = "3.130.10"

extension String {
    func versionToInt() -> [Int] {
        return self.components(separatedBy: ".")
            .map { Int.init($0) ?? 0 }
    }
}
//true
storeVersion.versionToInt().lexicographicallyPrecedes(currentVersion.versionToInt())

Swift 2 version compare

let storeVersion = "3.14.10"

let currentVersion = "3.130.10"
extension String {
    func versionToInt() -> [Int] {
      return self.componentsSeparatedByString(".")
          .map {
              Int.init($0) ?? 0
          }
    }
}

// true
storeVersion.versionToInt().lexicographicalCompare(currentVersion.versionToInt())