swift3 0 String 字串 的使用

var emptystring = ""               // 空字串字面量

var anotheremptystring = string()  // 初始化方法
// 兩個字串均為空並等價。

var variablestring = "horse"

variablestring += " and carriage"
// variablestring 現在為 "horse and carriage"

let lable = "the width is"

let val = 66
let lablewidth = lable + string(val)//swift不支援隱式型別轉換，需顯式轉換

let money :character = "¥"

let face:character = "?"
print("\(money) \(face)")
/*字串常量包含的特殊字元：空字元\0，反斜槓\，製表符\t，換行符\n，回車符\r，雙引號\"，單引號\'*/

let countstr = "wo shi sha sha de "

print("count's count is \(countstr.characters.count)")//算上空格

var str00 = "i am string"

let str01 = ""
let str02 = "我是字串"

str00.isempty

str01.characters.count

str00.hasprefix("i")//字首

str00.hassuffix("i")//字尾

str00.uppercased()

str00.lowercased()
str02.uppercased()//中文進行大小寫轉換不起作用
str00.capitalized

(str00 as nsstring).substring(to: 4)//留下字串前4個字母

(str00 as nsstring).substring(from: 4)//不要前4個字母
(str00 as nsstring).substring(with: nsmakerange(2, 2))

let index0 = str00.index(before: str00.endindex)

let index1 = str00.index(after: str00.startindex)
str00.remove(at:index0)
str00.remove(at: index1)

str00.range(of: "am")

let str3 = "10:20:c:d:e"

let result = str3.components(separatedby:":")

let characters = str3.sorted()

let str4 = "abcdefghi"

let startindex = str4.index(str4.startindex, offsetby:2)
let endindex = str4.index(startindex, offsetby:3)
let result4 = str4.replacingcharacters(in:startindex..int轉16進製制字串
int轉8進製字串
16進製制字串轉十進位制數
func strhextoint()   
}}

func stringtoint(str: string) -> array

return arr
}

var tempstr = "  he ll o \r\r"

let str = tempstr.trimmingcharacters(in: .whitespacesandnewlines)//"hello"

var temparray = readclientdatastring!.components(separatedby: .whitespacesandnewlines)

temparray = temparray.filter

var str = "hello s"

let strreplaced = str.replacingoccurrences(of: "s", with: "amberoot")//"hello amberoot"

let intdata = nsstring(format: "%d", 0x10).integervalue//16

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