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IOS Swift Code

3) You are creating a calculator app and you are using the MVC architecture discussed in class. You ate a view, a view contro

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Answer #1
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var display: UILabel!
var userIsInTheMiddleOfTyping = false
@IBAction func touchDigit(_ sender: UIButton) {
let digit = sender.currentTitle!
let textCurrentlyInDisplay = display.text!
if userIsInTheMiddleOfTyping {
display.text = textCurrentlyInDisplay + digit
} else {
display.text = digit
userIsInTheMiddleOfTyping = true
}
}
var displayValue: Double {
get {
return Double(display.text!)!
}
set {
display.text = String(newValue)
}
}
private var brain = CalculatorBrain()
@IBAction func performOperation(_ sender: UIButton) {
if userIsInTheMiddleOfTyping {
brain.setOperand(displayValue)
userIsInTheMiddleOfTyping = false
}
if let mathematicalSymbol = sender.currentTitle {
brain.performOperation(mathematicalSymbol)
}
if let result = brain.result {
displayValue = result
}
}
}
import Foundation
struct CalculatorBrain {
/* think about public API when creating models */
private var accumulator: Double?
private enum Operation {
case constant(Double)
case unaryOperation((Double)->Double)
case binaryOperation((Double, Double) -> Double)
case equals
}
private var operations: Dictionary<String, Operation> = [
"π": Operation.constant(Double.pi),
"e": Operation.constant(M_E),
"√": Operation.unaryOperation(sqrt),
"cos": Operation.unaryOperation(cos),
"±": Operation.unaryOperation{-$0},
"×": Operation.binaryOperation{$0 * $1},
"÷": Operation.binaryOperation{$0 / $1},
"−": Operation.binaryOperation{$0 - $1},
"+": Operation.binaryOperation{$0 + $1},
"=": Operation.equals
]
mutating func performOperation(_ symbol: String) {
if let operation = operations[symbol] {
switch operation {
case .constant(let value):
accumulator = value
case .unaryOperation(let function):
if accumulator != nil {
accumulator = function(accumulator!)
}
case .binaryOperation(let function):
if accumulator != nil {
pendingBinaryOperation = PendingBinaryOperation(function: function, firstOperand: accumulator!)
accumulator = nil
}
case .equals:
performPendingBinaryOperation()
}
}
}
private mutating func performPendingBinaryOperation() {
if pendingBinaryOperation != nil && accumulator != nil {
accumulator = pendingBinaryOperation!.perform(with: accumulator!)
pendingBinaryOperation = nil
}
}
private var pendingBinaryOperation: PendingBinaryOperation?
private struct PendingBinaryOperation {
let function: (Double, Double) -> Double
let firstOperand: Double
func perform(with secondOperand: Double) -> Double {
return function(firstOperand, secondOperand)
}
}
mutating func setOperand(_ operand: Double) {
accumulator = operand
}
/* read only property: computed property */
var result: Double? {
get {
return accumulator
}
}
}

{
"images" : [
{
"idiom" : "iphone",
"size" : "29x29",
"scale" : "2x"
},
{
"idiom" : "iphone",
"size" : "29x29",
"scale" : "3x"
},
{
"idiom" : "iphone",
"size" : "40x40",
"scale" : "2x"
},
{
"idiom" : "iphone",
"size" : "40x40",
"scale" : "3x"
},
{
"idiom" : "iphone",
"size" : "60x60",
"scale" : "2x"
},
{
"idiom" : "iphone",
"size" : "60x60",
"scale" : "3x"
}
],
"info" : {
"version" : 1,
"author" : "xcode"
}
} 
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11134" systemVersion="15F34" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" launchScreen="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="01J-lp-oVM">
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11106"/>
        <capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
    </dependencies>
    <scenes>
        <!--View Controller-->
        <scene sceneID="EHf-IW-A2E">
            <objects>
                <viewController id="01J-lp-oVM" sceneMemberID="viewController">
                    <layoutGuides>
                        <viewControllerLayoutGuide type="top" id="Llm-lL-Icb"/>
                        <viewControllerLayoutGuide type="bottom" id="xb3-aO-Qok"/>
                    </layoutGuides>
                    <view key="view" contentMode="scaleToFill" id="Ze5-6b-2t3">
                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
                    </view>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="iYj-Kq-Ea1" userLabel="First Responder" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="53" y="375"/>
        </scene>
    </scenes>
</document>
<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="11762" systemVersion="15G1217" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
<device id="retina3_5" orientation="portrait">
<adaptation id="fullscreen"/>
</device>
<dependencies>
<deployment identifier="iOS"/>
<plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="11757"/>
<capability name="Constraints to layout margins" minToolsVersion="6.0"/>
<capability name="documents saved in the Xcode 8 format" minToolsVersion="8.0"/>
</dependencies>
<scenes>
<!--View Controller-->
<scene sceneID="tne-QT-ifu">
<objects>
<viewController id="BYZ-38-t0r" customClass="ViewController" customModule="Calculator" customModuleProvider="target" sceneMemberID="viewController">
<layoutGuides>
<viewControllerLayoutGuide type="top" id="y3c-jy-aDJ"/>
<viewControllerLayoutGuide type="bottom" id="wfy-db-euE"/>
</layoutGuides>
<view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
<rect key="frame" x="0.0" y="0.0" width="320" height="480"/>
<autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
<subviews>
<stackView opaque="NO" contentMode="scaleToFill" axis="vertical" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="ejB-0M-qL0">
<rect key="frame" x="16" y="20" width="288" height="460"/>
<subviews>
<label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="0" textAlignment="right" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" minimumFontSize="9" translatesAutoresizingMaskIntoConstraints="NO" id="hHl-jG-xuj">
<rect key="frame" x="0.0" y="0.0" width="288" height="48"/>
<color key="backgroundColor" red="0.0" green="0.0" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<fontDescription key="fontDescription" type="system" pointSize="40"/>
<color key="textColor" red="1" green="1" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<nil key="highlightedColor"/>
</label>
<stackView opaque="NO" contentMode="scaleToFill" axis="vertical" distribution="fillEqually" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="omr-Vb-2gD">
<rect key="frame" x="0.0" y="58" width="288" height="402"/>
<subviews>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="7mi-Zt-hHj">
<rect key="frame" x="0.0" y="0.0" width="288" height="72.5"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Hkk-RF-cW3">
<rect key="frame" x="0.0" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="+"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="R9G-lc-dfJ"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="PD9-PJ-EAq">
<rect key="frame" x="74.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="−"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="N0y-zN-3UH"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="pMa-cH-paS">
<rect key="frame" x="149" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="÷"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="TcJ-sN-mAa"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="jPb-wY-4e6">
<rect key="frame" x="223.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="×"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="0fP-K9-skl"/>
</connections>
</button>
</subviews>
</stackView>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="xJC-53-7zN">
<rect key="frame" x="0.0" y="82.5" width="288" height="72.5"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="yw1-hH-yof">
<rect key="frame" x="0.0" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="π"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="osg-5g-YtB"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="O0b-5C-gVh">
<rect key="frame" x="74.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="7"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="GwI-ic-A3K"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Of2-RQ-Mmu">
<rect key="frame" x="149" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="8"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="K8f-5G-OVO"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="R9a-sD-Lol">
<rect key="frame" x="223.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="9"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="zax-BP-GFG"/>
</connections>
</button>
</subviews>
</stackView>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="2Za-tk-ibv">
<rect key="frame" x="0.0" y="165" width="288" height="72"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="Vdq-LL-5oO">
<rect key="frame" x="0.0" y="0.0" width="64.5" height="72"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="√"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="nMw-gw-nrb"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="mXb-Lm-bfI">
<rect key="frame" x="74.5" y="0.0" width="64.5" height="72"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="4"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="nn2-3c-5UD"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="FxL-Kd-GV8">
<rect key="frame" x="149" y="0.0" width="64.5" height="72"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="5"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="b9v-le-vsb"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="rq5-Bp-Qku">
<rect key="frame" x="223.5" y="0.0" width="64.5" height="72"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="6"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="M1s-jw-qIj"/>
</connections>
</button>
</subviews>
</stackView>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="tzH-Jh-dKf">
<rect key="frame" x="0.0" y="247" width="288" height="72.5"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="25j-97-aAq">
<rect key="frame" x="0.0" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="cos"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="mde-fu-uVf"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="uGl-ie-kIi">
<rect key="frame" x="74.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="1"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="aaG-BZ-h9A"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="W57-Dc-042">
<rect key="frame" x="149" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="2"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="btE-Is-h48"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="JTY-ua-kEq">
<rect key="frame" x="223.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="3"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="QZS-V0-fbZ"/>
</connections>
</button>
</subviews>
</stackView>
<stackView opaque="NO" contentMode="scaleToFill" distribution="fillEqually" spacing="10" translatesAutoresizingMaskIntoConstraints="NO" id="ABN-G3-GfG">
<rect key="frame" x="0.0" y="329.5" width="288" height="72.5"/>
<subviews>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="yEO-av-4B0">
<rect key="frame" x="0.0" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="±"/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="zaF-SA-yhb"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="fio-8Y-YcZ">
<rect key="frame" x="74.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="."/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="TnN-XK-Nom"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="NWz-SE-WnW">
<rect key="frame" x="149" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="0"/>
<connections>
<action selector="touchDigit:" destination="BYZ-38-t0r" eventType="touchUpInside" id="5mp-vT-jk8"/>
</connections>
</button>
<button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="roundedRect" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="f3w-R5-HPQ">
<rect key="frame" x="223.5" y="0.0" width="64.5" height="72.5"/>
<color key="backgroundColor" white="0.66666666666666663" alpha="1" colorSpace="calibratedWhite"/>
<fontDescription key="fontDescription" type="system" pointSize="30"/>
<color key="tintColor" red="0.0" green="0.50196081400000003" blue="1" alpha="1" colorSpace="calibratedRGB"/>
<state key="normal" title="="/>
<connections>
<action selector="performOperation:" destination="BYZ-38-t0r" eventType="touchUpInside" id="AQI-t7-6UT"/>
</connections>
</button>
</subviews>
</stackView>
</subviews>
</stackView>
</subviews>
</stackView>
</subviews>
<color key="backgroundColor" red="1" green="1" blue="1" alpha="1" colorSpace="custom" customColorSpace="sRGB"/>
<constraints>
<constraint firstItem="wfy-db-euE" firstAttribute="top" secondItem="ejB-0M-qL0" secondAttribute="bottom" id="14O-ga-P5Y"/>
<constraint firstItem="ejB-0M-qL0" firstAttribute="top" secondItem="y3c-jy-aDJ" secondAttribute="bottom" id="9s3-GW-Jlm"/>
<constraint firstAttribute="leadingMargin" secondItem="ejB-0M-qL0" secondAttribute="leading" id="IQY-SJ-217"/>
<constraint firstAttribute="trailingMargin" secondItem="ejB-0M-qL0" secondAttribute="trailing" id="Za5-m5-8Jc"/>
</constraints>
</view>
<connections>
<outlet property="display" destination="hHl-jG-xuj" id="5R3-7y-5wN"/>
</connections>
</viewController>
<placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
</objects>
<point key="canvasLocation" x="117.59999999999999" y="122.78860569715144"/>
</scene>
</scenes>
</document>
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