ios 十进制 十六进制 互相转换

十六进制转换成十进制

//16进制转10进制
        NSString * temp10 = [NSString stringWithFormat:@"%lu",strtoul([devId UTF8String],0,16)];
        NSLog(@"心跳数字 10进制 %@",temp10);

或

unsigned long long result = 0;
        NSScanner *scanner = [NSScanner scannerWithString:devId];
        [scanner scanHexLongLong:&result];
        NSLog(@"result = %llu",result);

十进制转换成十六进制

//将十进制转化为十六进制
-(NSString *)ToHex:(long long int)tmpid
{
    NSString *nLetterValue;
    NSString *str =@"";
    long long int 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 alloc]initWithFormat:@"%lli",ttmpig];
                
        }
        str = [nLetterValue stringByAppendingString:str];
        if (tmpid == 0) {
            break;
        }
        
    }
    return str;
}