本文实例为大家分享了iOS实现计算器小功能，供大家参考，具体内容如下
本文利用ios实现计算器app，后期将用mvc结构重构
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import UIKitclass CalculViewController: UIViewController { @IBOutlet weak var display: UILabel! var userIsInTheMiddleOFTypingANumber:Bool=false @IBAction func appendDigit(sender: UIButton) { let digit=sender.currentTitle! if userIsInTheMiddleOFTypingANumber { display.text=display.text!+digit }else{ display.text=digit userIsInTheMiddleOFTypingANumber=true } } var operandstack:Array<Double>=Array<Double>() @IBAction func operate(sender: UIButton) { let operation=sender.currentTitle!; if userIsInTheMiddleOFTypingANumber { enter() } switch operation { case "×":performeOperation{$0*$1} case "÷":performeOperation{$1/$0} case "+":performeOperation{$0+$1} case "-":performeOperation{$1-$0} case "√":performeOperation{sqrt($0)} default: break } }// func multiply(op1:Double,op2:Double) -> Double {// return op1*op2;// } func performeOperation(operation:(Double,Double)->Double){ if operandstack.count>=2 { displayValue=operation(operandstack.removeLast(),operandstack.removeLast()) enter() } } private func performeOperation(operation:Double->Double){ if operandstack.count>=1 { displayValue=operation(operandstack.removeLast()) enter() } } @IBAction func enter() { userIsInTheMiddleOFTypingANumber=false operandstack.append(displayValue) print("operandstack=\(operandstack)") } var displayValue:Double{ get{ return NSNumberFormatter().numberFromString(display.text!)!.doubleValue } set{ display.text="\(newValue)" userIsInTheMiddleOFTypingANumber=false } } |
知识点如下
计算型属性的setter与getter
swift利用函数作为参数
swift的重载，详情参见：swift override
效果如下
增加model文件
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import Foundationclass CalculatorBrain { private enum Op : CustomStringConvertible{ case operand(Double) case UnaryOperation(String,Double->Double) case BinaryOperation(String,(Double,Double)->Double) var description:String{ get{ switch self { case .operand(let operand): return "\(operand)" case .BinaryOperation(let symbol,_): return symbol case .UnaryOperation(let symbol, _): return symbol } } } } private var opstack=[Op]() private var knowOps=[String:Op]() init(){ func learnOp(op:Op){ knowOps[op.description]=op } learnOp(Op.BinaryOperation("×"){$0*$1}) learnOp(Op.BinaryOperation("÷"){$1/$0}) learnOp(Op.BinaryOperation("+"){$0+$1}) learnOp(Op.BinaryOperation("-"){$1-$0}) learnOp(Op.UnaryOperation("√"){sqrt($0)})// knowOps["×"]=Op.BinaryOperation("×"){$0*$1}// knowOps["÷"]=Op.BinaryOperation("÷"){$1/$0}// knowOps["+"]=Op.BinaryOperation("+"){$0+$1}// knowOps["-"]=Op.BinaryOperation("-"){$1-$0}// knowOps["√"]=Op.UnaryOperation("√"){sqrt($0)} } private func evaluate(ops:[Op])->(result:Double?,remainOps:[Op]){ if !ops.isEmpty { var remainOps=ops; let op=remainOps.removeLast() switch op { case Op.operand(let operand): return(operand,remainOps) case Op.UnaryOperation(_, let operation): let operandEvalution=evaluate(remainOps) if let operand=operandEvalution.result{ return(operation(operand),operandEvalution.remainOps) } case Op.BinaryOperation(_, let operation): let operandEvlution1=evaluate(remainOps) if let operand1=operandEvlution1.result { let operandEvlution2=evaluate(operandEvlution1.remainOps) if let operand2=operandEvlution2.result { return (operation(operand1,operand2),operandEvlution2.remainOps) } } } } return (nil,ops) } func evaluate()->Double?{ let (result,remainder)=evaluate(opstack) print("\(opstack)=\(result)with\(remainder)left over") return result } func pushOperand(operand:Double)->Double?{ opstack.append(Op.operand(operand)) return evaluate() } func performOperation(symbol:String)->Double?{ if let operation=knowOps[symbol]{ opstack.append(operation) } return evaluate() }} |
controll修改为
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import UIKitclass CalculViewController: UIViewController { @IBOutlet weak var display: UILabel! var userIsInTheMiddleOFTypingANumber:Bool=false var brain=CalculatorBrain() @IBAction func appendDigit(sender: UIButton) { let digit=sender.currentTitle! if userIsInTheMiddleOFTypingANumber { display.text=display.text!+digit }else{ display.text=digit userIsInTheMiddleOFTypingANumber=true } } //var operandstack:Array<Double>=Array<Double>() @IBAction func operate(sender: UIButton) { if userIsInTheMiddleOFTypingANumber { enter() } if let operation=sender.currentTitle{ if let result=brain.performOperation(operation) { displayValue=result }else{ displayValue=0 } } } @IBAction func enter() { userIsInTheMiddleOFTypingANumber=false if let result=brain.pushOperand(displayValue){ displayValue=result }else{ displayValue=0 } } var displayValue:Double{ get{ return NSNumberFormatter().numberFromString(display.text!)!.doubleValue } set{ display.text="\(newValue)" userIsInTheMiddleOFTypingANumber=false } }} |
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持服务器之家。
原文链接：https://blog.csdn.net/whuhan2013/article/details/52842191
