爱好玩

首先创建一个iOS Application 选择Single View Application

ViewController.swift代码如下

import UIKit

class ViewController: UIViewController {
    
    @IBOutlet var wv:UIWebView
    
    override func viewDidLoad() {
        super.viewDidLoad()
        wv.loadRequest(NSURLRequest(URL:NSURL(string:"http://www.superyyl.com")))
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
    }
}

import UIKit

class ViewController: UIViewController {

@IBOutlet var wv:UIWebView

override func viewDidLoad() {

super.viewDidLoad()

wv.loadRequest(NSURLRequest(URL:NSURL(string:"http://www.superyyl.com")))

}

override func didReceiveMemoryWarning() {

super.didReceiveMemoryWarning()

}

在Main.storyboard里,拖入一个Web View

然后将WebView和ViewController里的wv,通过Referencing Outlets连接起来

使@IBOutlet var wv:UIWebView旁边的圆点变成实心的

接着运行,就可以看到模拟器里的WebView成功载入网页了

定义class

class Hi {
    func sayHi(){
        println("Hi superyyl")
    }
}

class Hi {

func sayHi(){

println("Hi superyyl")

}

实例化

var hi = Hi()

1	var hi = Hi()

调用类方法

hi.sayHi()//Hi superyyl

1	hi.sayHi()//Hi superyyl

继承

class Hello:Hi {   
}

1 2	class Hello:Hi { }

调用继承方法

var h = Hello()
h.sayHi()//Hi superyyl

1 2	var h = Hello() h.sayHi()//Hi superyyl

重写方法

class Hello:Hi {
    override func sayHi() {
        println("Hello superyyl")
    }
}

var h = Hello()
h.sayHi()//Hello superyyl

class Hello:Hi {

override func sayHi() {

println("Hello superyyl")

}

var h = Hello()

h.sayHi()//Hello superyyl

构造方法和成员变量

class Hello:Hi {
    var _name:String
    
    init(name:String) {
        println("Init Hello")
        self._name = name
    }
    
    override func sayHi(){
        println("Hello (self._name)")
    }
}

var h = Hello(name:"ZhangSan")
h.sayHi()//Hello ZhangSan

class Hello:Hi {

var _name:String

init(name:String) {

println("Init Hello")

self._name = name

}

override func sayHi(){

println("Hello (self._name)")

}

var h = Hello(name:"ZhangSan")

h.sayHi()//Hello ZhangSan

需要注意的是,传参数和OC一样,需要有个标签

没有返回值的调用

func sayHello(name:String) {
    println("Hello (name)")
}
sayHello("superyyl")//Hello superyyl

func sayHello(name:String) {

println("Hello (name)")

}

sayHello("superyyl")//Hello superyyl

多个返回值的调用

func getNums()->(Int,Int) {
    return (2,3)
}
let (a,b) = getNums()
println("a=(a),b=(b)")//a=2,b=3

func getNums()->(Int,Int) {

return (2,3)

}

let (a,b) = getNums()

println("a=(a),b=(b)")//a=2,b=3

函数也是类型,可以赋值

var fun = sayHello
fun("World")//Hello World

1 2	var fun = sayHello fun("World")//Hello World

输出所有偶数

for index in 0..100 {
    if index % 2 == 0 {
        println(index) //输出所有偶数
    }
}

for index in 0..100 {

if index % 2 == 0 {

println(index) //输出所有偶数

}

判断myName是否为空

var myName:String? = "superyyl"
myName = nil

if let name = myName {
    println("Hello (name)")
}

var myName:String? = "superyyl"

myName = nil

if let name = myName {

println("Hello (name)")

}

关于教程里的”?”我是没看懂,找啊找,于是发现了这篇文章<Swift之?和!>

一下子解决了好多疑问

简单的for循环

var arr = String[]()
for index in 0..100{
    arr.append("Item(index)")
}
println(arr)

var arr = String[]()

for index in 0..100{

arr.append("Item(index)")

}

println(arr)

遍历数组

for value in arr{
    println(value)
}

for value in arr{

println(value)

}

while循环遍历

var i = 0
while i<arr.count{
    println(arr[i])
    i++
}

var i = 0

while i<arr.count{

println(arr[i])

i++

}

遍历字典

var dict = ["name":"superyyl","age":"16"]
for (key,value) in dict{
    println("(key),(value)")
}
/*
name,superyyl
age,16
*/

var dict = ["name":"superyyl","age":"16"]

for (key,value) in dict{

println("(key),(value)")

}

name,superyyl

age,16

字典就相当于OC里的NSDictionary,根据视频里的例子

var dict = ["name":"superyyl","age":"16"]
dict["sex"] = "Female"
println(dict)//[sex: Female, name: superyyl, age: 16]
println(dict["name"])//superyyl

var dict = ["name":"superyyl","age":"16"]

dict["sex"] = "Female"

println(dict)//[sex: Female, name: superyyl, age: 16]

println(dict["name"])//superyyl

好吧,这里说一下我遇到的一个问题

var dict = ["name":"superyyl","age":16]
println(dict)
/*
{
    age = 16;
    name = superyyl;
}
*/
dict["sex"] = "Female" //error:Cannot assign to the result of the Expression

var dict = ["name":"superyyl","age":16]

println(dict)

{

age = 16;

name = superyyl;

}

dict["sex"] = "Female" //error:Cannot assign to the result of the Expression

我觉得我既然开始时候没指定dict的value类型,就应该让我随便添加,我认为这应该算是个bug吧,不知道苹果是怎么考量的,为什么混合的value类型就不允许添加

Swift的数组用[]可以直接声明,里面的元素可以混着写

var arr = ["Hello","World",100,2.3]
println(arr)
/*
(
    Hello,
    World,
    100,
    "2.3"
)
*/

var arr = ["Hello","World",100,2.3]

println(arr)

(

Hello,

World,

100,

"2.3"

)

声明一个空数组

var arr = []
var strArr = String[]() //指定存放类型的空数组

1 2	var arr = [] var strArr = String[]() //指定存放类型的空数组

一般的字符串之间连接可以直接用加号(+)连接

var str = "Hello "
str = str + "World"

1 2	var str = "Hello " str = str + "World"

swift也提供了一种类似于占位符的连接方式,可以连接字符串和其他类型

var str = "Hello "
str = str + "World"
var i = 100
str = "(str),other words,(i)"
println(str)//Hello World,other words,100

var str = "Hello "

str = str + "World"

var i = 100

str = "(str),other words,(i)"

println(str)//Hello World,other words,100

swift支持类型推导,一般用var不需要指定类型

var str = "This is a string"

1	var str = "This is a string"

需要指定类型时,可以这样

var str:String = "This is a string"
var i:Int = 100

1 2	var str:String = "This is a string" var i:Int = 100

Swift里变量用var,常量用let来定义

var a = 10
a = 20
var b = 100
let c = a + b

println(c) //120

c = 100 //error:Cannot assign to 'let' value 'c'

var a = 10

a = 20

var b = 100

let c = a + b

println(c) //120

c = 100 //error:Cannot assign to 'let' value 'c'

变量声明后可以随时改变值,而常量只能赋值一次,再赋值则会直接报错

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爱好玩

Stay Hungry, Stay Foolish.

[Swift]开发iOS项目

[Swift]面向对象

[Swift]函数

[Swift]流程控制

[Swift]循环

[Swift]字典

[Swift]数组

[Swift]字符串连接

[Swift]类型

[Swift]变量与常量