Compare Version

CompareVersion.swift

extension String {
    func isNewer(than compareVersion: String) -> Bool {
        if self.compare(compareVersion, options: NSString.CompareOptions.numeric) == ComparisonResult.orderedDescending {
            return true
        }
        return false
    }
}

"0.9.0".isNewer(than: "0.9")    // true

let currentVersion = "0.9.0"
let targetVersion = "0.9.5"

if !currentVersion.isNewer(than: targetVersion) {
    // update
}