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  • Swift-3-字符串和字符

    // Playground - noun: a place where people can play
    
    import UIKit
    
    var someString = "some string literal value"
    someString += "another"
    
    // 初始化空字符串 2种方式,得出的结果一致
    var emptyString = ""
    var anotherEmptyString = String()
    
    if emptyString.isEmpty {
        println("emptyString is empty")
    }
    
    // 可变字符串
    var varibleString = "hosrse"
    varibleString += "and carriage"
    
    let constantString = "hignlander"
    //constantString += "anything" // 字符串常量不能修改,出错
    
    // swift中字符串是值类型 value type
    
    // 连接字符串
    var string1 = "hello"
    var string2 = " there"
    var welcome = string1 + string2
    
    // 向字符串后添加字符
    let exclamationMark : Character = "!"
    welcome.append(exclamationMark)
    
    // 字符串插值 ()
    let multiplier = 3
    let message = "(multiplier) times 2.5 is (Double(multiplier) * 2.5)"
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  • 原文地址:https://www.cnblogs.com/liufeng24/p/4117177.html
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