Swift Development String+nsstring Detailed use

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Viewcontroller.swift

Swift+string

Import UIKit

Class Viewcontroller:uiviewcontroller {

Override Func Viewdidload () {

Super.viewdidload ()

The var variable let constant does not describe too much

Self.view.backgroundColor = Uicolor.yellow;

Let my:nsstring = "My Name"

Let name = "are FAI"

var myName = ""

Let myfirst:nsstring = "My Name"

MyName = (my as String) + name

Print (MyName)

Calculate the length of a string

Print (myfirst.length)//nsstring type string

Print (MyName.characters.count)//string type string

Get string position

var stra = "China is the most powerful country"

Let startindex = stra.startindex//get start position

Print (startindex)

Let EndIndex = stra.endindex//Get End position

Print (EndIndex)

Let char = Stra[stra.index (After:startindex)]//gets the character that corresponds to a subscript after a subscript

Print (char)

Let char2 = Stra[stra.index (before:endindex)]//gets the character that corresponds to the previous subscript of a subscript

Print (CHAR2)

Let subString = Stra[startindex...stra.index (startindex, Offsetby:4)]//get a substring in a string by scope

Print (subString)

Let num = Stra.range (of: "Most powerful")//Gets the range of a string in the parent string

Print (num)

Stra.append ("World of")//Append string operation

Print (Stra)

Stra.insert ("~", At:strA.index (Stra.startindex, offsetby:10))//In the specified position, such as a group of characters

Print (Stra)

Stra.replacesubrange (Stra.startindex...stra.index (Stra.startindex, Offsetby:9), with: "Our big China Stands Forever")//Replace a string in the specified range

Print (Stra)

Stra.remove (At:strA.index (Before:strA.endIndex))//delete a character at the specified location

Print (Stra)

Stra.removesubrange (Stra.startindex...stra.index (Stra.startindex, Offsetby:2))

Print (Stra)

var StrB = "MyName"

StrB = strb.uppercased ()//full capitalization

Print (StrB)

StrB = strb.lowercased ()//convert all to lowercase

Print (StrB)

Connection of strings

String type strings

Let str1:string = "Up"

Let str2:string = "sea"

Connect two strings using the "+" sign

var str3:string = str1 + str2

Print (STR3)

Stitching strings at the end of the string instead of Str3.extend ("123456789")

Str3.write ("123456789")

Print (STR3)

string comparison

Sting type String

Let str4:string = "Shanghai"

Let str5:string = "Shanghai"

Determine if a string is equal

Let Bl1:bool = STR4 = = STR5

Print (BL1)

Determines whether a string is empty

Let Bl2:bool = Str4.isempty

Print (BL2)

Judging string prefixes

Let Bl3:bool = Str4.hasprefix ("SHANG")

Print (BL3)

To determine a string suffix

Let Bl4:bool = Str4.hassuffix ("HAI")

Print (BL4)

Comparison of two strings

Let Result1:comparisonresult = Str4.compare (STR5)

Print (RESULT1)

Ignore case comparison

Let Result2:comparisonresult = Str4.caseinsensitivecompare (STR5)

Print (RESULT2)

Nssting type String

Let str6:nsstring = "Shanghai"

Let str7:nsstring = "Shanghai"

Determine if two strings are equal

Let Bl5:bool = Str6.isequal (STR7)

Print (BL5)

Judging string prefixes

Let Bl6:bool = Str6.hasprefix ("Shang")

Print (BL6)

To determine a string suffix

Let Bl7:bool = Str6.hassuffix ("Hai")

Print (BL7)

Ignore case comparison

Let Result3:comparisonresult = Str6.compare (str7 as String)

Print (RESULT3)

Let Result4:comparisonresult = Str6.caseinsensitivecompare (str7 as String)

Print (RESULT4)

String cutting

Sting type String

Let str11:string = "Dong$fang$ming$zhu"

String is cut by character

Let Arr1:array = str11.components (separatedby: "$")

Print (ARR1)

Automatically according to the "/" split string NSString Unique, string does not

Let str13:nsstring = "Users/jhq0228/desktop"

Let Arr3:array = str13.pathcomponents

Print (ARR3)

The conversion of a string to a number is a little less than a bit of an understanding.

String type strings

Character to number

Let Charr:character = "A";

var charval1:int = 0

String to traverse character conversion to

For Charstr in String (Charr). Unicodescalars {

Converts the removed character to an Int type number

CharVal1 = Int (charstr.value)

}

String to Number

Numeric string-to-Int number, instead of intstr.toint ()

Let intstr:string = "64"; Let Intval1:int? = Int (INTSTR)

Numeric to character

Let IntVal2 = 65; Let Charval2:character = Character (Unicodescalar (INTVAL2)!)

Numeric to String

Int type numeric to string

Let intval3:int = 123; Let intstr1:string = Intval3.description

Int32 type Digital to string

Let Int32val1:int32 = 32; Let int32str1:string = Int32val1.description

Int64 type Digital to string

Let Int64val1:int64 = 64; Let int64str1:string = Int64val1.description

Float type numeric to string

Let floatval1:float = 2.1; Let floatstr1:string = Floatval1.description

Double numeric-to-string

Let doubleval1:double = 162.1; Let doublestr1:string = Doubleval1.description

Bool type to String

Let Boolval1:bool = true; Let boolstr1:string = Boolval1.description

NSString type String

String to Number

String-to-Int number

Let Intval4:int = NSString (string: "6432"). IntegerValue

String to Int32 type number

Let Int32val2:int32 = NSString (string: "+"). Intvalue

String to Int64 type number

Let Int64val2:int64 = NSString (string: "$"). Longlongvalue

String to float type number

Let Floatval2:float = NSString (string: "2.1"). Floatvalue

String to Double type number

Let doubleval2:double = NSString (string: "162.1"). Doublevalue

String to Bool type

Let Boolval2:bool = NSString (string: "false"). Boolvalue

Additional setup after loading the view, typically from a nib.

}

Override Func didreceivememorywarning () {

Super.didreceivememorywarning ()

Dispose of any resources the can be recreated.

}

}

Swift Development String+nsstring Detailed use