Swift 基础2

// 传统写法
for var i = 0; i < 10; i++ {
　　print(i)
}

for i in 0...10 {
    print(i)
}

for _ in 0..<10 {
    print("hello")
}

var a = 0
while a < 10 {
    a++
}

let b = 0
repeat {
    print(b)
    b++
} while b < 20    

// 字符串遍历
var str = "Hello, Swift"
for c in str.characters {
    print(c)
}    

let str1 = "Hello"
let str2 = "World"
let str3 = str1 + str2

let name = "ape"
let age = 18

let info = "my name is \(name), age is \(age)"

let min = 3
let second = 4

let time = String(format: "%02d:%02d", arguments: [min, second])

// 定义一个可变数组,必须初始化才能使用

var array1 : [String] = [String]()

// 定义一个不可变数组
let array2 : [NSObject] = ["ape", 18]

var stuArray1:Array<String>
var stuArray2: [String]

// 定义时直接初始化
var array = ["ape", "ryan", "jack"]

// 先定义,后初始化
var array : Array<String>
array = ["ape", "ryan", "jack"]

// 添加数据
array.append("rose")

// 删除元素
array.removeFirst()

// 修改元素
array[0] = "jim"

// 取值
array[1]

// 遍历数组
for i in 0..<array.count {
print(array[i])
}

// for in方式
for item in array {
print(item)
}

// 设置遍历的区间
for item in array[0..<2] {
print(item)
}

// 数组合并
// 注意:只有相同类型的数组才能合并
var array = ["ape", "adam","jack"]
var array1 = ["rose", "ryan"]
var array2 = array + array1;

// 不建议一个数组中存放多种类型的数据
var array3 = [2, 3, "ryan"]
var array4 = ["jack", 23]
array3 + array4

// 定义一个可变字典
var dict1 : [String : NSObject] = [String : NSObject]()

// 定义一个不可变字典
let dict2 = ["name" : "jack", "age" : 18]

var dict1: Dictionary<Int, String>
var dict2: [Int: String]

// 定时字典的同时,进行初始化
var dict = ["name" : "ryan", "age" : 18]

// swift中任意对象,通常不使用NSObject,使用AnyObject
var dict : Dictionary<String, AnyObject>
dict = ["name" : "jim", "age" : 18]

// 添加数据
dict["height"] = 1.88
dict["weight"] = 70.0
dict

// 删除字段
dict.removeValueForKey("height")
dict

// 修改字典
dict["name"] = "jack"
dict

// 查询字典
dict["name"]

// 遍历字典中所有的值
for value in dict.values {
print(value)
}
// 遍历字典中所有的键
for key in dict.keys {
print(key)
}

// 遍历所有的键值对
for (key, value) in dict {
print(key)
print(value)
}

// 字典的合并
var dict1 = ["name" : "rose", "age" : 20]
var dict2 = ["height" : 1.87, "phoneNum" : "+86 11011"]
// 字典不可以相加合并
for (key, value) in dict1 {
dict2[key] = value
}

// 元组:HTTP错误
// let array = [404, "Not Found"]
// 写法一:
let error = (404, "Not Found")
print(error.0)
print(error.1)

// 写法二:
let error = (errorCode : 404, errorInfo : "Not Found")
print(error.errorCode)
print(error.errorInfo)

// 写法三:
let (errorCode, errorIno) = (404, "Not Found")
print(errorCode)
print(errorIno)