作业

main.swift

import Foundation

//建立1000个女朋友实例，输出其信息和约会语句
for var i in 1 ... 1000 {
    var temp = GirlFriends(name:"(randomName(4))", age:randomAge(18, max:30))
    print(temp)
    print(" 第 (i) 名女朋友 (temp.name) 同意和你约会。")
}

random func.swift

import Foundation

//设立随机年龄，范围是18-30
func randomAge(min:Int, max:Int) -> Int {
    return (Int(arc4random()) % (max-min+1) + min)
}


//设立随机4个字母的名字，范围是 A-Z
func random(min:UInt32, max:UInt32) -> UInt32 {
    return arc4random_uniform(max-min) + min
}
func randomName(len:Int) -> String {
    let min:UInt32 = 65
    let max:UInt32 = 90
    var string = ""
    for _ in 0 ..< len {
        string.append (UnicodeScalar(random(min, max:max)) )
    }
    return string
}

class-friends.swift

import Foundation

//建立性别的 enum
public enum Gender:String {
    case male
    case female
}

//建立 class Friends
public class Friends:NSObject {
    
    private var _name   : String
    private var _age    : Int
    private var _gender : Gender
    
    //初始化
    init (name:String, age:Int, gender:Gender = Gender.female) {
        _name   = name
        _age    = age
        _gender = gender
    }
    
    // name 的 get 和 set 方法
    public var name:String {
        get{
            return "(_name)"
        }
        set{
            _name = newValue
        }
    }
    
    // age 的 get 和 set 方法
    public var age:Int {
        get{
            return _age
        }
        set{
            _age = newValue
        }
    }
    
    // gender 的 get-only 方法
    public var gender:Gender {
        get{
            return _gender
        }
    }
    
    //重写 description
    override public var description:String {
        get{
            return " 姓名: (name) , 年龄: (age)"
        }
    }
    
    //建立 date 方法
    public func date() {
        print("女朋友(_name)同意和你约会.")
    }
}

subclass-girlfriends.swift

import Foundation
//建立 Friends 的子类 GirlFriends
class GirlFriends:Friends {
    init(name:String, age:Int) {
        super.init(name:name, age:age, gender:Gender.female)
    }
}