String

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    //string 和 Int的相互转换    let numStr = "07d77"    var n:Int = 0    //String转Int    if let number = Int(numStr){        n = number    }    //Int转字符串    print(String(n) + "jiji")    //下面也可以    let i = (str as NSString).intValue    //截取字符串    let subStr : String = (mStr as NSString).substring(with: NSRange(location: 2, length: 2));    //PS：进行字符串操作时，截取等操作，String不如NSString方便，用as进行转换    //循环遍历字符串，字符串倒置    let mStr = "0123456789!"    for charetder : Character in mStr.characters {        print(charetder)    }    let revertStr = String(mStr.characters.reversed())    print(revertStr)    //字符串比较    if str1 == str2 {        print("equal")    }    if str.hasPrefix(str1) {        print("has prefix")    }    if str.hasSuffix(str2) {        print("has suffix")    }    //大小写转换    let largeStr = str.uppercased()    let xiaoStr = largeStr.lowercased()    //输出utf8编码，0-255    for codeUnit in str.utf8 {        print(codeUnit)    }
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