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  • Swift 字符串常用方法

            //字符串的定义
            var string = "Hello,swift";
            let string1 = "hello,swift";
            let string3 = "";
            let string4 = string;
            print(string);
            print(string.uppercased());// 大写
            print(string.lowercased());//小写
            //字符串字节
            let leng = string.lengthOfBytes(using: String.Encoding.utf8);
            print(leng);
            //获取字符串长度
            let leng2 = string1.characters.count;
            print(leng2,string3.characters.count,string4.characters.count);
            //字符串遍历
            for char in string1.characters{
                print(char);
            }
            //字符串拼接
            string += "liping";
            print(string);
            let str5 = string3 + string;
            print("str5=",str5);
            let str6 = [NSString .localizedStringWithFormat("%@,%@,%@","你好","开发","请善待")];
            print(str6)
            //追加字符
            string.append("!")
            print(string);
            //字符串截取
            let subStr = (string as NSString).substring(with: NSMakeRange(1, 6));
            let subStr2 = (string as NSString).substring(from: 5);
            let subStr3 = (string as NSString).substring(to: 5);
            print("subStr=",subStr,"subStr2=",subStr2,"subStr3=",subStr3)
            //字符串比较
            let s1:NSString = "你好,swift"
            let s2:NSString = "你好,李平";
            if s1.isEqual(to: s2 as String) {
                print("s1=s2");
            }else{
                print("s1!=s2");
            }
            //比较字符串的前缀后缀
            let array = ["do.docx","good.docx","name.docx","data.json","good.json"];
            for arrStr in array{
                if arrStr.hasPrefix("good") {
                    print("前缀为good:(arrStr)");
                }
                if arrStr.hasSuffix(".json") {
                    print("后缀为.json:(arrStr)");
                }
            }
            //字符串查找
            let s3:NSString = "swift";
            if (s1 as NSString).contains(s3 as String) {
                print("s1里面存在s3");
            }else{
                print("不存在");
            }
            //数字化字符串
            let s4 = "789";
            print("数字化:((s4 as NSString).intValue)");

    详细代码查看:https://github.com/xiaolitou-ping/Swift-All

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  • 原文地址:https://www.cnblogs.com/laolitou-ping/p/7678155.html
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