Mobile App Dev 2021W: Tutorial 10: Difference between revisions

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Created page with " ==Code== ===ViewController.swift=== <syntaxhighlight lang="swift" line> // // ViewController.swift // Converter-SB // // Created by Anil Somayaji on 2021-04-06. // impo..."
 
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==Code==
==Code==
===ViewController.swift===
<syntaxhighlight lang="swift" line>
//
//  ViewController.swift
//  Converter-SB
//
//  Created by Anil Somayaji on 2021-04-06.
//
import UIKit
class ViewController: UIViewController {
    @IBOutlet var fromField: UITextField!
    @IBOutlet weak var result: UILabel!
    @IBOutlet weak var convButton: UIButton!
   
    var convIndex = 0
    var conv = conversions[availConversions[0]]!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    @IBAction func updateConversion() {
        convIndex = (convIndex + 1 ) % availConversions.count
        conv = conversions[availConversions[convIndex]]!
        convButton.setTitle("Conversion: \(availConversions[convIndex])", for: .normal)
    }
   
    @IBAction func doConversion() {
        if let fromS = fromField.text {
            if let from = Double(fromS) {
                result.text =
                    conv.formatConversion(from)
            } else {
                result.text = "Please enter a number."
            }
        }
    }
}
</syntaxhighlight>


===Conversions.swift===
===Conversions.swift===
Line 92: Line 48:


let availConversions = [String] (conversions.keys)
let availConversions = [String] (conversions.keys)
</syntaxhighlight>
===ViewController.swift===
<syntaxhighlight lang="swift" line>
//
//  ViewController.swift
//  Converter-SB
//
//  Created by Anil Somayaji on 2021-04-06.
//
import UIKit
class ViewController: UIViewController {
    @IBOutlet var fromField: UITextField!
    @IBOutlet weak var result: UILabel!
    @IBOutlet weak var convButton: UIButton!
   
    var convIndex = 0
    var conv = conversions[availConversions[0]]!
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }
    @IBAction func updateConversion() {
        convIndex = (convIndex + 1 ) % availConversions.count
        conv = conversions[availConversions[convIndex]]!
        convButton.setTitle("Conversion: \(availConversions[convIndex])", for: .normal)
    }
   
    @IBAction func doConversion() {
        if let fromS = fromField.text {
            if let from = Double(fromS) {
                result.text =
                    conv.formatConversion(from)
            } else {
                result.text = "Please enter a number."
            }
        }
    }
}
</syntaxhighlight>
</syntaxhighlight>


Revision as of 02:37, 7 April 2021

Code

Conversions.swift

//  Conversions.swift

struct Converter {
    var convFrom = "From Type"
    var convTo = "To Type"
    var convert: (_ from: Double) -> Double?
    
    func formatConversion(_ from: Double) -> String {
        if let to = self.convert(from) {
            let toS = String(format: "%.3f", to)
            return "\(from) \(self.convFrom) is \(toS) \(self.convTo)."
        } else {
            return "Converting \(from) \(convFrom) to \(self.convTo) failed."
        }
    }
    
    init(_ from: String, _ to: String, _ f: @escaping (_ from: Double) -> Double?) {
        self.convFrom = from
        self.convTo = to
        self.convert = f
    }
}

func InToCM(_ inch: Double) -> Double {
    let cm = 2.54 * inch
    return cm
}

let conversions =
    ["F to C": Converter("Farenheit", "Celsius",
                         {F in return ((F - 32.0)*(5/9))}),
     "C to F": Converter("Celsius", "Farenheit",
                         {C in return ((9/5)*C + 32.0)}),
     "km to mi": Converter("kilometers", "miles",
                           {k in
                            let m = k * 0.6213712
                            return m
                           }),
     "inch to cm": Converter("inches", "centimeters",
                             InToCM)
    ]

let availConversions = [String] (conversions.keys)

ViewController.swift

//
//  ViewController.swift
//  Converter-SB
//
//  Created by Anil Somayaji on 2021-04-06.
//

import UIKit

class ViewController: UIViewController {
    @IBOutlet var fromField: UITextField!
    @IBOutlet weak var result: UILabel!
    @IBOutlet weak var convButton: UIButton!
    
    var convIndex = 0
    var conv = conversions[availConversions[0]]!

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view.
    }

    @IBAction func updateConversion() {
        convIndex = (convIndex + 1 ) % availConversions.count
        conv = conversions[availConversions[convIndex]]!
        convButton.setTitle("Conversion: \(availConversions[convIndex])", for: .normal)
    }
    
    @IBAction func doConversion() {
        if let fromS = fromField.text {
            if let from = Double(fromS) {
                result.text =
                    conv.formatConversion(from)
            } else {
                result.text = "Please enter a number."
            }
        }
    }
}

Main.storyboard

<?xml version="1.0" encoding="UTF-8"?>
<document type="com.apple.InterfaceBuilder3.CocoaTouch.Storyboard.XIB" version="3.0" toolsVersion="17701" targetRuntime="iOS.CocoaTouch" propertyAccessControl="none" useAutolayout="YES" useTraitCollections="YES" useSafeAreas="YES" colorMatched="YES" initialViewController="BYZ-38-t0r">
    <device id="retina4_7" orientation="portrait" appearance="light"/>
    <dependencies>
        <plugIn identifier="com.apple.InterfaceBuilder.IBCocoaTouchPlugin" version="17703"/>
        <capability name="Safe area layout guides" minToolsVersion="9.0"/>
        <capability name="System colors in document resources" minToolsVersion="11.0"/>
        <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="Converter_SB" customModuleProvider="target" sceneMemberID="viewController">
                    <view key="view" contentMode="scaleToFill" id="8bC-Xf-vdC">
                        <rect key="frame" x="0.0" y="0.0" width="375" height="667"/>
                        <autoresizingMask key="autoresizingMask" widthSizable="YES" heightSizable="YES"/>
                        <subviews>
                            <textField opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="left" contentVerticalAlignment="center" borderStyle="roundedRect" textAlignment="center" minimumFontSize="17" translatesAutoresizingMaskIntoConstraints="NO" id="VJ7-bt-qir">
                                <rect key="frame" x="0.0" y="122" width="375" height="34"/>
                                <fontDescription key="fontDescription" type="system" pointSize="14"/>
                                <textInputTraits key="textInputTraits"/>
                                <connections>
                                    <action selector="doConversion" destination="BYZ-38-t0r" eventType="editingChanged" id="WEr-SS-N11"/>
                                </connections>
                            </textField>
                            <button opaque="NO" contentMode="scaleToFill" contentHorizontalAlignment="center" contentVerticalAlignment="center" buttonType="system" lineBreakMode="middleTruncation" translatesAutoresizingMaskIntoConstraints="NO" id="QgR-df-1nY">
                                <rect key="frame" x="0.0" y="44" width="375" height="30"/>
                                <state key="normal" title="Button"/>
                                <connections>
                                    <action selector="updateConversion" destination="BYZ-38-t0r" eventType="touchUpInside" id="u10-i8-VVe"/>
                                </connections>
                            </button>
                            <label opaque="NO" userInteractionEnabled="NO" contentMode="left" horizontalHuggingPriority="251" verticalHuggingPriority="251" text="Label" textAlignment="center" lineBreakMode="tailTruncation" baselineAdjustment="alignBaselines" adjustsFontSizeToFit="NO" translatesAutoresizingMaskIntoConstraints="NO" id="QHi-YO-lly">
                                <rect key="frame" x="0.0" y="164" width="375" height="21"/>
                                <fontDescription key="fontDescription" type="system" pointSize="17"/>
                                <nil key="textColor"/>
                                <nil key="highlightedColor"/>
                            </label>
                        </subviews>
                        <viewLayoutGuide key="safeArea" id="6Tk-OE-BBY"/>
                        <color key="backgroundColor" systemColor="systemBackgroundColor"/>
                        <constraints>
                            <constraint firstItem="6Tk-OE-BBY" firstAttribute="trailing" secondItem="VJ7-bt-qir" secondAttribute="trailing" id="1By-U1-T9I"/>
                            <constraint firstItem="QgR-df-1nY" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="3rM-HL-fub"/>
                            <constraint firstItem="QHi-YO-lly" firstAttribute="top" secondItem="VJ7-bt-qir" secondAttribute="bottom" constant="8" id="4Mw-3g-c0Y"/>
                            <constraint firstItem="VJ7-bt-qir" firstAttribute="top" secondItem="QgR-df-1nY" secondAttribute="bottom" constant="48" id="IBz-Q9-HJr"/>
                            <constraint firstAttribute="trailing" secondItem="QHi-YO-lly" secondAttribute="trailing" id="LsV-b9-Mq7"/>
                            <constraint firstItem="QHi-YO-lly" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="NS2-ki-p00"/>
                            <constraint firstItem="QHi-YO-lly" firstAttribute="top" secondItem="VJ7-bt-qir" secondAttribute="bottom" constant="8" symbolic="YES" id="NX0-K4-DfK"/>
                            <constraint firstAttribute="trailing" secondItem="QgR-df-1nY" secondAttribute="trailing" id="ckB-TL-gBc"/>
                            <constraint firstItem="QgR-df-1nY" firstAttribute="top" secondItem="6Tk-OE-BBY" secondAttribute="top" constant="44" id="q2m-Gg-fyA"/>
                            <constraint firstItem="VJ7-bt-qir" firstAttribute="leading" secondItem="6Tk-OE-BBY" secondAttribute="leading" id="tT6-p8-3IJ"/>
                        </constraints>
                    </view>
                    <connections>
                        <outlet property="convButton" destination="QgR-df-1nY" id="6Dj-hw-rOA"/>
                        <outlet property="fromField" destination="VJ7-bt-qir" id="hkS-Oj-aWr"/>
                        <outlet property="result" destination="QHi-YO-lly" id="QEU-E4-Ty3"/>
                    </connections>
                </viewController>
                <placeholder placeholderIdentifier="IBFirstResponder" id="dkx-z0-nzr" sceneMemberID="firstResponder"/>
            </objects>
            <point key="canvasLocation" x="-215" y="40"/>
        </scene>
    </scenes>
    <resources>
        <systemColor name="systemBackgroundColor">
            <color white="1" alpha="1" colorSpace="custom" customColorSpace="genericGamma22GrayColorSpace"/>
        </systemColor>
    </resources>
</document>
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