Swift基础之方法实战

1.和之前一样

2.代码

//
//  ViewController.swift
//  SwitfLesson_exam
//
//  Created by 薛雨仑 on 14-10-7.
//  Copyright (c) 2014年 Dylan. All rights reserved.
//

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        
        // 1.
        // Change Two temper
        // 2种元组的初始化
        var a = "Alice"
        var b = "Dylan"
        var myType = (a, b)
        
        var name:String
        var family:String
        (name, family) = ("Alice", "Dylan")
        
        // test func change
        swap(&a, with: &b)
        println(a)
        println(b)
        
        // 2.
        // print String
        // test func flexString
        println(flexStrings(s1:"Alice ", s2: "Dylan"))
        
        // 3.
        // sumAny
        // test func sumAny
        println(sumAny(1, 2, 3))
        
        // 4.
        // countFrom
        // test func countFrom
        countFrom(from: 1, to: 5)
    }
    
    /**
    1. fun change
    交换2个任意对象的值
    */
    func swap<T>(inout a:T, inout with b:T) {
        (a, b) = (b, a)
    }
    
    /**
    2. func flexStrings
    输出字符串
    */
    func flexStrings(s1:String = "", s2:String = "") ->String {
        return s1 + s2 == "" ? "none" : s1+s2
    }
    
    /**
    3. func sumAny
    */
    func sumAny(anys: Any...) ->String {
        return String(
            (anys.map({item in
                switch item {
                case "" as String, 0 as Int:
                    return -10
                case let s as String where s.toInt() > 0:
                    return s.toInt()!
                case is Int:
                    return item as Int
                default:
                    return 0
                }
            }) as [Int]).reduce(0, combine: {
                $0 + $1
            })
        )
    }
    
    /**
    4. func countFrom
    */
    func countFrom(#from: Int, to:Int) {
        println(from)
        if from < to {
            countFrom(from: from + 1, to: to)
        }
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}