Convert swift to objective c

Code Block language
func getProvisioningProfileExpirationDate() -> Date?
{
		self.getCertificateExpirationDate()
		let profilePath: String? = Bundle.main.path(forResource: "embedded", ofType: "mobileprovision")
		if( profilePath != nil )
		{
				let plistData = NSData(contentsOfFile: profilePath!)
				let plistDataString = String(format: "%@", plistData!)
				var plistString: String = extractPlist(fromMobileProvisionDataString:plistDataString)
				let pattern = "<key>ExpirationDate</key>.*<date>(.*)</date>"
				let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive)
				let textCheckingResult : NSTextCheckingResult = regex.firstMatch(in: plistString, options: NSRegularExpression.MatchingOptions(rawValue: UInt(0)), range: NSMakeRange(0, plistString.characters.count))!
				let matchRange : NSRange = textCheckingResult.range(at: 1)
				let expirationDateString : String = (plistString as NSString).substring(with: matchRange)
				let dateFormatter = DateFormatter()
				dateFormatter.locale = Locale.current
				dateFormatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ssZ"
				print( "Profile expires: \(dateFormatter.date(from: expirationDateString)!)" )
				return dateFormatter.date(from: expirationDateString)!
		}
		return nil
}
func extractPlist( fromMobileProvisionDataString:String ) -> String
{
		// Remove brackets at beginning and end
		var range = Range(NSMakeRange(0, 1), in: fromMobileProvisionDataString)
		var plistDataString = fromMobileProvisionDataString.replacingCharacters(in:range!, with: "")
		range = Range(NSMakeRange(plistDataString.count-1, 1), in: plistDataString)
		plistDataString.replaceSubrange(range!, with: "")
		// Remove spaces
		plistDataString = plistDataString.replacingOccurrences(of: " ", with: "")
		// convert hex to ascii
		let profileText = hexStringtoAscii( plistDataString )
		// I tried using regular expressions and normal NSString operations to get this, but it simply wouldn't work, so I went with this ugly method.
		// return extractPlistText(fromProfileString:profileText)
		// Remove whitespaces and new lines characters and splits into individual lines.
		let profileWords = profileText.components(separatedBy: CharacterSet.newlines)
		var plistString = "";
		var inPlist = false;
		for word in profileWords
		{
				if( word.contains("<plist") ) { inPlist = true }
				if( inPlist ) {	plistString.append(" "); plistString.append( word ) }
				if (word.contains("</plist")) { inPlist = false }
		}
		return plistString;
}
func hexStringtoAscii(_ hexString : String) -> String {
		let pattern = "(0x)?([0-9a-f]{2})"
		let regex = try! NSRegularExpression(pattern: pattern, options: .caseInsensitive)
		let nsString = hexString as NSString
		let matches = regex.matches(in: hexString, options: [], range: NSMakeRange(0, nsString.length))
		let characters = matches.map {
				Character(UnicodeScalar(UInt32(nsString.substring(with: $0.range(at: 2)), radix: 16)!)!)
		}
		return String(characters)
}
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