Swift character (Character)

Swift's character is a single character string literal, the data type of Character.

The following example shows the two characters Example:

import Cocoa

let char1: Character = "A"
let char2: Character = "B"

print("char1 的值为 \(char1)")
print("char2 的值为 \(char2)")

The above program execution output is:

char1 的值为 A
char2 的值为 B

If you want to Character (character) type constants stored in more characters, the program execution will be given as follows:

import Cocoa

// Swift 中以下赋值会报错
let char: Character = "AB"

print("Value of char \(char)")

The above program execution output is:

error: cannot convert value of type 'String' to specified type 'Character'
let char: Character = "AB"

Null character variable

Swift can not create an empty Character (character) type variable or constant:

import Cocoa

// Swift 中以下赋值会报错
let char1: Character = ""
var char2: Character = ""

print("char1 的值为 \(char1)")
print("char2 的值为 \(char2)")

The above program execution output is:

 error: cannot convert value of type 'String' to specified type 'Character'
let char1: Character = ""
                       ^~
error: cannot convert value of type 'String' to specified type 'Character'
var char2: Character = ""

Traversal characters in a string

Swift represents a collection of type String Character specific sequence (character) type values. Each character represents a Unicode character.

You can string of characters to traverse the attributes for-in loop to get the value of each character:

import Cocoa

for ch in "Hello".characters {
   print(ch)
}

The above program execution output is:

H
e
l
l
o

Character string concatenation

String The following example demonstrates the use of the append () method to achieve the connection string of characters:

import Cocoa

var varA:String = "Hello "
let varB:Character = "G"

varA.append( varB )

print("varC  =  \(varA)")

The above program execution output is:

varC  =  Hello G