Object-c 普通字符串、二进制、十进制、十六进制之间的相互转换

废话不说了，直接看代码，这个是在IOS开发中（objc）普通字符串与二进制、十进制、十六进制之间的相互转换，下面的方法能满足大部分场景，不满足的，可以参考转换一下即可，希望对大家有点帮助。

////  NSStringConvertUtil.h//  TestSocket////  Created by gj on 2017/4/27.//  Copyright © 2017年 juis. All rights reserved.//#import <Foundation/Foundation.h>@interface NSStringConvertUtil : NSObject//计算字节长度+(NSInteger) computeStringLength:(NSString *) string;//普通字符串转换为二进制。+(NSString *)StingToBinary:(NSString *)string;//二进制转字符串+ (NSString *)BinaryToNSString:(NSData *)data;//普通字符串转换为十六进制。+ (NSString *)hexStringFromString:(NSString *)string;// 十六进制转换为普通字符串。+ (NSString *)convertHexStrToString:(NSString *)hexString;// 十六进制转二进制+ (NSString *)getBinaryByhex:(NSString *)hex;// 二进制转十六进制+ (NSString *)BinaryToHex:(NSData *)data;//十进制转十六进制+ (NSString *)ToHex:(uint16_t)tmpid;//  十进制转二进制+ (NSString *)toBinarySystemWithDecimalSystem:(NSString *)decimal;//  二进制转十进制+ (NSString *)toDecimalSystemWithBinarySystem:(NSString *)binary;@end

////  NSStringConvertUtil.m//  TestSocket////  Created by gj on 2017/4/27.//  Copyright © 2017年 juis. All rights reserved.//#import "NSStringConvertUtil.h"@implementation NSStringConvertUtil//计算字节长度+(NSInteger) computeStringLength:(NSString *)string{        NSInteger length = [string lengthOfBytesUsingEncoding:NSUTF8StringEncoding];    //    length -= (length - string.length) / 2;    //    length = (length +1) / 2;        return length;    }//普通字符串转换为二进制。+(NSString *)StingToBinary:(NSString *)string{        NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];    Byte *bytes = (Byte *)[myD bytes];    //下面是Byte 转换为16进制。    NSString *hexStr=@"";    for(int i=0;i<[myD length];i++)    {        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数        if([newHexStr length]==1)            hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];        else            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];    }        return [self getBinaryByhex:hexStr];    }//普通字符串转换为十六进制。+ (NSString *)hexStringFromString:(NSString *)string{    NSData *myD = [string dataUsingEncoding:NSUTF8StringEncoding];    Byte *bytes = (Byte *)[myD bytes];    //下面是Byte 转换为16进制。    NSString *hexStr=@"";    for(int i=0;i<[myD length];i++)    {        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数        if([newHexStr length]==1)            hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];        else            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];    }    return hexStr;}// 十六进制转换为普通字符串。+ (NSString *)convertHexStrToString:(NSString *)hexString{    if (!hexString || [hexString length] == 0) {        return nil;    }    NSLog(@"line : %d, func: %s ",__LINE__, __func__);    char *myBuffer = (char *)malloc((int)[hexString length] / 2 + 1);    bzero(myBuffer, [hexString length] / 2 + 1);    for (int i = 0; i < [hexString length] - 1; i += 2) {        unsigned int anInt;        NSString * hexCharStr = [hexString substringWithRange:NSMakeRange(i, 2)];        NSScanner * scanner = [[[NSScanner alloc] initWithString:hexCharStr] init];        [scanner scanHexInt:&anInt];        myBuffer[i / 2] = (char)anInt;    }    NSString *unicodeString = [NSString stringWithCString:myBuffer encoding:4];    //NSLog(@"------字符串=======%@",unicodeString);    return unicodeString;}// 十六进制转二进制+(NSString *)getBinaryByhex:(NSString *)hex{    NSMutableDictionary  *hexDic = [[NSMutableDictionary alloc] init];    hexDic = [[NSMutableDictionary alloc] initWithCapacity:16];    [hexDic setObject:@"0000" forKey:@"0"];    [hexDic setObject:@"0001" forKey:@"1"];    [hexDic setObject:@"0010" forKey:@"2"];    [hexDic setObject:@"0011" forKey:@"3"];    [hexDic setObject:@"0100" forKey:@"4"];    [hexDic setObject:@"0101" forKey:@"5"];    [hexDic setObject:@"0110" forKey:@"6"];    [hexDic setObject:@"0111" forKey:@"7"];    [hexDic setObject:@"1000" forKey:@"8"];    [hexDic setObject:@"1001" forKey:@"9"];    [hexDic setObject:@"1010" forKey:@"A"];    [hexDic setObject:@"1011" forKey:@"B"];    [hexDic setObject:@"1100" forKey:@"C"];    [hexDic setObject:@"1101" forKey:@"D"];    [hexDic setObject:@"1110" forKey:@"E"];    [hexDic setObject:@"1111" forKey:@"F"];    [hexDic setObject:@"1010" forKey:@"a"];    [hexDic setObject:@"1011" forKey:@"b"];    [hexDic setObject:@"1100" forKey:@"c"];    [hexDic setObject:@"1101" forKey:@"d"];    [hexDic setObject:@"1110" forKey:@"e"];    [hexDic setObject:@"1111" forKey:@"f"];    NSMutableString *binaryString=[[NSMutableString alloc] init];        for (int i=0; i<[hex length]; i++) {        NSRange rage;        rage.length = 1;        rage.location = i;        NSString *key = [hex substringWithRange:rage];        binaryString = [NSMutableString stringWithFormat:@"%@%@",binaryString,[NSString stringWithFormat:@"%@",[hexDic objectForKey:key]]];    }    return binaryString;}//十进制转十六进制+ (NSString *)ToHex:(uint16_t)tmpid{    NSString *nLetterValue;    NSString *str =@"";    uint16_t ttmpig;    for (int i = 0; i<9; i++) {        ttmpig=tmpid%16;        tmpid=tmpid/16;        switch (ttmpig)        {            case 10:                nLetterValue =@"A";break;            case 11:                nLetterValue =@"B";break;            case 12:                nLetterValue =@"C";break;            case 13:                nLetterValue =@"D";break;            case 14:                nLetterValue =@"E";break;            case 15:                nLetterValue =@"F";break;            default:                nLetterValue = [NSString stringWithFormat:@"%u",ttmpig];        }        str = [nLetterValue stringByAppendingString:str];        if (tmpid == 0) {            break;        }    }    return str;}//  十进制转二进制+ (NSString *)toBinarySystemWithDecimalSystem:(NSString *)decimal{    int num = [decimal intValue];    int remainder = 0;      //余数    int divisor = 0;        //除数        NSString * prepare = @"";        while (true)    {        remainder = num%2;        divisor = num/2;        num = divisor;        prepare = [prepare stringByAppendingFormat:@"%d",remainder];                if (divisor == 0)        {            break;        }    }        NSString * result = @"";    for (int i = prepare.length - 1; i >= 0; i --)    {        result = [result stringByAppendingFormat:@"%@",                  [prepare substringWithRange:NSMakeRange(i , 1)]];    }        return result;}//  二进制转十进制+ (NSString *)toDecimalSystemWithBinarySystem:(NSString *)binary{    int ll = 0 ;    int  temp = 0 ;    for (int i = 0; i < binary.length; i ++)    {        temp = [[binary substringWithRange:NSMakeRange(i, 1)] intValue];        temp = temp * powf(2, binary.length - i - 1);        ll += temp;    }        NSString * result = [NSString stringWithFormat:@"%d",ll];        return result;}//二进制转十六进制+ (NSString *)BinaryToHex:(NSData *)data {    if (!data) {        return nil;    }        NSString * binary=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];            NSMutableDictionary  *hexDic = [[NSMutableDictionary alloc] init];    hexDic = [[NSMutableDictionary alloc] initWithCapacity:16];    [hexDic setObject:@"0" forKey:@"0000"];    [hexDic setObject:@"1" forKey:@"0001"];    [hexDic setObject:@"2" forKey:@"0010"];    [hexDic setObject:@"3" forKey:@"0011"];    [hexDic setObject:@"4" forKey:@"0100"];    [hexDic setObject:@"5" forKey:@"0101"];    [hexDic setObject:@"6" forKey:@"0110"];    [hexDic setObject:@"7" forKey:@"0111"];    [hexDic setObject:@"8" forKey:@"1000"];    [hexDic setObject:@"9" forKey:@"1001"];    [hexDic setObject:@"A" forKey:@"1010"];    [hexDic setObject:@"B" forKey:@"1011"];    [hexDic setObject:@"C" forKey:@"1100"];    [hexDic setObject:@"D" forKey:@"1101"];    [hexDic setObject:@"E" forKey:@"1110"];    [hexDic setObject:@"F" forKey:@"1111"];        NSMutableString *hexString=[[NSMutableString alloc] init];        for (int i=0; i<[binary length]; i+=4) {        NSRange rage;        rage.length = 4;        rage.location = i;        NSString *key = [binary substringWithRange:rage];        hexString = [NSMutableString stringWithFormat:@"%@%@",hexString,[NSString stringWithFormat:@"%@",[hexDic objectForKey:key]]];    }        return hexString;}//二进制转字符串+ (NSString *)BinaryToNSString:(NSData *)data {        NSString * str=[self BinaryToHex:data];        NSString *tmp=[self convertHexStrToString:str];        return tmp;}@end