계산기 [Step3] is, june #32
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,199 @@ | ||
| // | ||
| // Calculator - ViewController.swift | ||
| // Created by yagom. | ||
| // Copyright © yagom. All rights reserved. | ||
| // | ||
|
|
||
| import UIKit | ||
|
|
||
| final class CalculatorViewController: UIViewController { | ||
|
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| private enum Constant { | ||
| static let zero = "0" | ||
| static let doubleZero = "00" | ||
| static let dot = "." | ||
| static let allClear = "AC" | ||
| static let clearEntry = "CE" | ||
| static let NotANumber = "NaN" | ||
| static let emptyString = "" | ||
| static let comma = "," | ||
| static let nine = "9" | ||
| } | ||
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| @IBOutlet private weak var operatorLabel: UILabel! | ||
| @IBOutlet private weak var entryNumberLabel: UILabel! | ||
| @IBOutlet private weak var calculationHistoryScrollView: UIScrollView! | ||
| @IBOutlet private weak var calculationHistoryContentView: UIStackView! | ||
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| private let numberFormatter: NumberFormatter = { | ||
| let formatter = NumberFormatter() | ||
| formatter.numberStyle = .decimal | ||
| formatter.minimumFractionDigits = 0 | ||
| formatter.maximumFractionDigits = 20 | ||
| return formatter | ||
| }() | ||
|
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| private let maxDigitLength = 15 | ||
| private var isDisplayNumberZeroOnly: Bool { | ||
| displayNumber == Constant.zero | ||
| } | ||
| private var formulaString = Constant.emptyString | ||
| private var isTypingNumber = false | ||
| private var displayNumber: String = Constant.zero { | ||
| willSet { | ||
| guard let lastElement = newValue.last else { | ||
| return | ||
| } | ||
| let lastCharacter = String(lastElement) | ||
| switch lastCharacter { | ||
| case Constant.dot: | ||
| entryNumberLabel.text?.append(lastCharacter) | ||
| case Constant.zero...Constant.nine: | ||
| entryNumberLabel.text = parse(newValue) | ||
| default: | ||
| entryNumberLabel.text = newValue | ||
| } | ||
| } | ||
| } | ||
| private var displayOperator: String = Constant.emptyString { | ||
| willSet { | ||
| operatorLabel.text = newValue | ||
| } | ||
| } | ||
|
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| @IBAction private func digitButtonDidTap(_ sender: UIButton) { | ||
| guard let digit = sender.currentTitle, displayNumber.count < maxDigitLength else { | ||
| return | ||
| } | ||
| if isTypingNumber { | ||
| displayNumber += digit | ||
| } else { | ||
| displayNumber = digit | ||
| isTypingNumber = true | ||
| } | ||
| } | ||
|
|
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| @IBAction private func arithmeticOperatorButtonDidTap(_ sender: UIButton) { | ||
| if displayNumber == Constant.NotANumber { | ||
| displayNumber = Constant.zero | ||
| } | ||
| guard let buttonTitle = sender.currentTitle else { | ||
| return | ||
| } | ||
| if isTypingNumber || false == isDisplayNumberZeroOnly { | ||
| addCalculationHistory() | ||
| } | ||
| displayOperator = buttonTitle | ||
| clearEntry() | ||
| } | ||
|
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| @IBAction private func equalsButtonDidTap(_ sender: UIButton) { | ||
| guard false == displayOperator.isEmpty else { | ||
| return | ||
| } | ||
| print(formulaString) | ||
| addCalculationHistory() | ||
| let result = calculationResult(from: formulaString) | ||
| print(formulaString, result, displayNumber) | ||
| displayNumber = result | ||
| clearOperatorAndFormulaString() | ||
| isTypingNumber = false | ||
| } | ||
|
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| @IBAction private func clearButtonDidTap(_ sender: UIButton) { | ||
| switch sender.currentTitle { | ||
| case Constant.clearEntry: | ||
| clearEntry() | ||
| case Constant.allClear: | ||
| clearAll() | ||
| default: | ||
| return | ||
| } | ||
| } | ||
|
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| @IBAction private func signToggleButtonDidTap(_ sender: UIButton) { | ||
| guard nil != sender.currentTitle, | ||
| false == isDisplayNumberZeroOnly, | ||
| let number = Double(displayNumber) else { | ||
| return | ||
| } | ||
| displayNumber = String(number * -1) | ||
| } | ||
|
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| @IBAction private func zeroOrPointButtonDidTap(_ sender: UIButton) { | ||
| guard let buttonTitle = sender.currentTitle, | ||
| displayNumber.count < maxDigitLength else { | ||
| return | ||
| } | ||
|
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| switch buttonTitle { | ||
| case Constant.zero, Constant.doubleZero: | ||
| if isDisplayNumberZeroOnly { | ||
| return | ||
| } | ||
| let suffix = (displayNumber + buttonTitle).count > maxDigitLength ? Constant.zero : buttonTitle | ||
| displayNumber += suffix | ||
| case Constant.dot: | ||
| if displayNumber.contains(Constant.dot) { | ||
| return | ||
| } | ||
| displayNumber += buttonTitle | ||
| isTypingNumber = true | ||
| default: | ||
| return | ||
| } | ||
| } | ||
| } | ||
|
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| extension CalculatorViewController { | ||
| // MARK: CalculationResult | ||
| private func calculationResult(from formula: String) -> String { | ||
| let result = ExpressionParser.parse(from: formula).result() | ||
| switch result { | ||
| case .success(let res): | ||
| return String(res) | ||
| case .failure(let error): | ||
| return error.description | ||
| } | ||
| } | ||
|
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| // MARK: Parse - numberFormat | ||
| private func parse(_ value: String) -> String { | ||
| let removedComma = value.replacingOccurrences(of: Constant.comma, with: Constant.emptyString) | ||
| let nsNumber = numberFormatter.number(from: removedComma) | ||
| return (numberFormatter.string(for: nsNumber) ?? Constant.zero) | ||
| } | ||
|
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| // MARK: Add History | ||
| private func addCalculationHistory() { | ||
| let currOperator = formulaString.isEmpty ? Constant.emptyString : displayOperator | ||
| appendHistoryStackView(operator: currOperator) | ||
| formulaString += "\(currOperator)\(displayNumber)" | ||
| } | ||
|
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| private func appendHistoryStackView(operator: String?) { | ||
| let parsedNumber = parse(displayNumber) | ||
| let stackView = HistoryStackView(operator: `operator`, operand: parsedNumber) | ||
| calculationHistoryContentView.addArrangedSubview(stackView) | ||
|
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| view.layoutIfNeeded() | ||
|
There was a problem hiding this comment. layoutIfNeeded는 왜 호출했나요? 꼭 필요한 코드인가요? |
||
| calculationHistoryScrollView.scrollToBottom() | ||
| } | ||
|
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| // MARK: Clear | ||
| private func clearEntry() { | ||
| displayNumber = Constant.zero | ||
| isTypingNumber = false | ||
| } | ||
|
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| private func clearOperatorAndFormulaString() { | ||
| displayOperator = Constant.emptyString | ||
| formulaString = Constant.emptyString | ||
| } | ||
|
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| private func clearAll() { | ||
| clearEntry() | ||
| clearOperatorAndFormulaString() | ||
| calculationHistoryContentView.removeAllHistorySubviews() | ||
| } | ||
| } | ||
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,15 @@ | ||
| // | ||
| // UIScrollView+Extension.swift | ||
| // Calculator | ||
| // | ||
| // Created by sei_dev on 1/25/23. | ||
| // | ||
|
|
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| import UIKit | ||
|
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| extension UIScrollView { | ||
| func scrollToBottom() { | ||
| let bottomOffset = CGPoint(x: 0, y: contentSize.height - bounds.size.height + contentInset.bottom) | ||
| setContentOffset(bottomOffset, animated: true) | ||
| } | ||
| } |
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,16 @@ | ||
| // | ||
| // UIStackView+Extension.swift | ||
| // Calculator | ||
| // | ||
| // Created by sei_dev on 1/25/23. | ||
| // | ||
|
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| import UIKit | ||
|
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| extension UIStackView { | ||
| func removeAllHistorySubviews() { | ||
| arrangedSubviews.forEach { history in | ||
| history.removeFromSuperview() | ||
| } | ||
| } | ||
| } |
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상수를 enum으로 정리한 부분 좋습니다 👍