macOSのバージョン番号を取得する方法一覧

//OSX 10.10以降
print(ProcessInfo.processInfo.operatingSystemVersion)
//OperatingSystemVersion(majorVersion: 10, minorVersion: 12, patchVersion: 5)
print(ProcessInfo.processInfo.operatingSystemVersion.majorVersion)
//10
print(ProcessInfo.processInfo.operatingSystemVersion.minorVersion)
//12
print(ProcessInfo.processInfo.operatingSystemVersion.patchVersion)
//5


print(ProcessInfo.processInfo.operatingSystemVersionString)
//Version 10.12.5 (Build 16F73)

if let dict: NSDictionary = NSDictionary(contentsOfFile: "/System/Library/CoreServices/SystemVersion.plist") {
    if let version = dict.object(forKey: "ProductVersion") as? String {
        print(version)
    }
}
//10.12.5

NSProcessInfo

    /* Human readable, localized; appropriate for displaying to user or using in bug emails and such; NOT appropriate for parsing */
    open var operatingSystemVersionString: String { get }

    
    @available(OSX 10.10, *)
    open var operatingSystemVersion: OperatingSystemVersion { get }