// ViewController.swift // CalculatorTest // // Created by babykang on 15/4/11. // Copyright (c) 2015年 Fiona. All rights reserved. //
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var numberShow: UILabel!
var userInTheMiddleOfTyping = false
@IBAction func apendDigit(sender: UIButton) {
var digit = sender.currentTitle!
if userInTheMiddleOfTyping{
numberShow.text = numberShow.text! + digit
}else {
numberShow.text = digit
userInTheMiddleOfTyping = true
}
}
@IBAction func operate(sender: UIButton) {
let operation = sender.currentTitle!
if userInTheMiddleOfTyping {
enter()
}
switch operation{
case "✖️":preformOperation {$0*$1} //({(op1, op2)in return op1 * op2})
case "➗":preformOperation {$0/$1} //({(op1,op2) in return op1 / op2})
case "➕":preformOperation {$0+$1} //({(op1,op2) in return op1 + op2})
case "➖":preformOperation {$0-$1} //({(op1,op2) in return op1 - op2})
case "√": preformOperation {sqrt($0)}
case "%":preformOperation {$0%$1}
default:break
}
}
func preformOperation(operation:(Double,Double)->Double){
if operandStack.count >= 2{
numberShowValue = operation(operandStack.removeLast(), operandStack.removeLast())
enter()
}
}
func preformOperation(operation:(Double)->Double){
if operandStack.count >= 2{
numberShowValue = operation(operandStack.removeLast())
enter()
}
} //在swift里，定义两个名字一样的函数是可以的，因为两个函数的参数不同，在运行时，系统会自己选择适合自己的函数。
/* func multitype (op1:Double, op2:Double)->Double { return op1*op2 }
func divide (op1:Double, op2:Double)->Double {
return op1 / op2
}
func plus (op1:Double, op2:Double)->Double {
return op1 + op2
}
func subtraction (op1:Double, op2:Double)->Double {
return op1 - op2
}
*/
var operandStack = Array<Double>()
@IBAction func enter() {
userInTheMiddleOfTyping = false
operandStack.append(numberShowValue)
println("operandStack = \(operandStack)")
}
var numberShowValue : Double{
get {
return NSNumberFormatter().numberFromString(numberShow.text!)!.doubleValue
}
set{
numberShow.text = "\(newValue)"
userInTheMiddleOfTyping = false
}
}
@IBAction func startButton(sender: UIButton) {
numberShow.text = "0"
}
override func viewDidLoad() {
super.viewDidLoad()
// Do any additional setup after loading the view, typically from a nib.
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}