Games Keeper for Apple Watch

Interface.storyboard

<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder.WatchKit.Storyboard" version="3.0" toolsVersion="9532" systemVersion="15D21" targetRuntime="watchKit" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" initialViewController="AgC-eL-Hgc">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="9530"/>
        <plugIn identifier="com.apple.InterfaceBuilder.IBWatchKitPlugin" version="9515"/>
    </dependencies>
    <scenes>
        <!--Games-->
        <scene sceneID="aou-V4-d1y">
            <objects>
                <controller title="Games" id="AgC-eL-Hgc" customClass="InterfaceController" customModule="GamesKeeperWatch" customModuleProvider="target">
                    <items>
                        <group width="1" height="1" alignment="left" layout="vertical" id="MZJ-RV-5I2">
                            <items>
                                <label width="1" height="0.40000000000000002" alignment="left" text="0" textAlignment="center" id="8Zp-qC-Wlv">
                                    <color key="textColor" red="1" green="0.70588235290000001" blue="0.0" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                    <fontDescription key="font" type="system" pointSize="52"/>
                                </label>
                                <group width="1" height="0.59999999999999998" alignment="left" id="MpW-xp-I4F">
                                    <items>
                                        <button width="0.40000000000000002" height="1" alignment="left" title="−" id="UKP-O4-oGe">
                                            <color key="backgroundColor" red="0.3803921569" green="0.2156862745" blue="0.82745098039999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <fontDescription key="font" type="boldSystem" pointSize="52"/>
                                            <connections>
                                                <action selector="decrementScore" destination="AgC-eL-Hgc" id="9hw-eD-a8E"/>
                                            </connections>
                                        </button>
                                        <button width="0.59999999999999998" height="1" alignment="left" title="+" id="O6W-17-t8a">
                                            <color key="backgroundColor" red="0.3803921569" green="0.2156862745" blue="0.82745098039999998" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                                            <fontDescription key="font" type="boldSystem" pointSize="52"/>
                                            <connections>
                                                <action selector="incrementScore" destination="AgC-eL-Hgc" id="2j8-Rw-0uA"/>
                                            </connections>
                                        </button>
                                    </items>
                                </group>
                            </items>
                        </group>
                    </items>
                    <menu key="menu" id="Lzt-a8-TzU">
                        <items>
                            <menuItem title="Reset" icon="resume" id="cC8-O9-FFS">
                                <connections>
                                    <action selector="resetScore" destination="AgC-eL-Hgc" id="DTo-AF-ZlD"/>
                                </connections>
                            </menuItem>
                        </items>
                    </menu>
                    <connections>
                        <outlet property="scoreLabel" destination="8Zp-qC-Wlv" id="YJh-0R-TUb"/>
                    </connections>
                </controller>
            </objects>
        </scene>
    </scenes>
</document>

InterfaceController.swift

//
//  InterfaceController.swift
//  GamesKeeperWatch Extension
//
//  Created by Vincent Tourraine on 29/02/16.
//  Copyright © 2016 Studio AMANgA. All rights reserved.
//

import WatchKit
import Foundation


class InterfaceController: WKInterfaceController {

    @IBOutlet var scoreLabel: WKInterfaceLabel!

    var score: Int = 0 {
        didSet {
            scoreLabel .setText(String(score))
        }
    }


    // MARK: - Actions

    @IBAction func decrementScore() {
        score = score - 1
    }

    @IBAction func incrementScore() {
        score = score + 1
    }

    @IBAction func resetScore() {
        score = 0
    }
}