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swift-学习之路,字典、数组、循环-控制流,
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- //
- // ViewController.swift
- // UIWindow
-
-
- import UIKit
- import Foundation
- class ViewController: UIViewController {
-
-
- @IBOutlet weak var usrNameLabel: UITextField!
-
-
- @IBOutlet weak var passwdLabel: UITextField!
-
- @IBAction func btnTouch(sender: AnyObject) {
-
- println("usrName is \(self.usrNameLabel.text)");
- println("passwdLabel is \(self.passwdLabel.text)");
-
- }
-
- override func viewDidLoad() {
- super.viewDidLoad()
- println("Hello World");
- let label = "The width is"
- let width = 90
- let widthLabel = label + String(width)
- println("widthLabel is \(widthLabel)")
-
- var shoppingList = ["catfish","water","tulips","blue paint"]
- shoppingList[1] = "bottle of water"
-
- var occupations = [
- "Malcolm":"Captain","Kaylee":"Machanic",]
- occupations["Jayne"] = "Public Relation"
-
- //初始化一个空的数组
- let emptyArray = [String]()
- //初始化一个空的字典
- let emptyDictionary = [String : Float]()
-
-
-
- let individualscores = [75,43,103,87,12]
-
- var teamscore = 0
- //循环语句的使用
- for score in individualscores{
- if(score > 50)
- {
- teamscore += 3
- }
- else
- {
- teamscore += 1
- }
- }
- print(teamscore)
-
-
- var optionalString:String? = "Hello"
- optionalString == nil
-
- var optionalName:String? = "John Appleasee"
- var greeting = "Hello"
-
- /*if let name = optionalName{
- greeting = "Hello,\(name)"
- }
- */
- //如果可选值为nil 则不会执行代码块的内容
-
- /*
- optionalName = nil
- if let name = optionalName{
- greeting = "Hello \(name)"
- }
- print(greeting)
- */
-
- optionalName = nil
- if let name = optionalName{
- greeting = "Hello \(name)"
- }else{
- greeting = "-执行的第二句代码-"
- }
- print(greeting)
-
-
- /**
- switch 支持任意类型的数据以及各种比较操作-不限于整数和表达式
- // 不需要加break
- */
-
-
- let vegetable = "red pepper"
-
- switch vegetable{
- case "celery":
- let vegetableComment = "Add some raisins and make ants on a log."
- case "cucumber","watercress":
- let vegetableComment = "That would make a good tea sandwich."
- case let x where x.hasSuffix("pepper"):
- let vegetableComment = "Is it a spicy\(x)?"
- default:
- let vegetableComment = "Everything tastes good in soup."
- }
-
-
- /// 这里用于比较字典中的最大值并且把变量是哪种类型的输出来
- let interestingNumbers = [
- "Prime":[2,3,5,7,11,13],"Fibonacci":[1,1,2,8],"Square":[1,4,9,16,25],]
- var largest = 0
- var name:String?
- for (kind,numbers) in interestingNumbers{
- for number in numbers{
- if number > largest{
- largest = number
- name = kind
- }
- }
- }
- println(largest)
- println(name)
-
- /**
- 1+2+....+100;
- */
- //这里用起来十分的方便,程序不运行会有提示,可以试试如果i的值不++ 可以观察一下
- var sum = 0
- var i = 0
- while i <= 100{
- sum += i
- i++
- }
- print(sum)
-
-
- /**
- ..< 和 ... 表示范围
- ..< 不包含上届 ...包含上届
- */
-
- var firstForLoop = 0
- for i in 0..<3{
- firstForLoop += i
- }
- print(firstForLoop)
-
- var secondForLoop = 0
- for var i = 0;i < 3; ++i{
- secondForLoop += i;
- }
- print(secondForLoop)
- //self.usrNameLabel.
- // 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.
- }
-
-
- }