iOS时间类型转换和各种数据类型进行转换

</pre><pre name="code" class="objc">/** *  时间转换部分 * //从1970年开始到现在经过了多少秒 -(NSString *)getTimeSp { NSString *time; NSDate *fromdate=[NSDate date]; time = [NSString stringWithFormat:@"%f",[fromdate timeIntervalSince1970]]; return time; }  //将时间戳转换成NSDate,转换的时间我也不知道是哪国时间,应该是格林尼治时间 -(NSDate *)changeSpToTime:(NSString*)spString { NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:[spString intValue]]; NSLog(@"%@",confromTimesp); return confromTimesp; }  //将时间戳转换成NSDate,加上时区偏移。这个转换之后是北京时间 -(NSDate*)zoneChange:(NSString*)spString { NSDate *confromTimesp = [NSDate dateWithTimeIntervalSince1970:[spString intValue]]; NSTimeZone *zone = [NSTimeZone systemTimeZone]; NSInteger interval = [zone secondsFromGMTForDate:confromTimesp]; NSDate *localeDate = [confromTimesp  dateByAddingTimeInterval: interval]; NSLog(@"%@",localeDate); return localeDate; }  //比较给定NSDate与当前时间的时间差，返回相差的秒数 -(long)timeDifference:(NSDate *)date { NSDate *localeDate = [NSDate date]; long difference =fabs([localeDate timeIntervalSinceDate:date]); return difference; }  //将NSDate按yyyy-MM-dd HH:mm:ss格式时间输出 -(NSString*)nsdateToString:(NSDate *)date { NSDateFormatter *dateFormat=[[NSDateFormatter alloc]init]; [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSString* string=[dateFormat stringFromDate:date]; NSLog(@"%@",string); return string; }  //将yyyy-MM-dd HH:mm:ss格式时间转换成时间戳 -(long)changeTimeToTimeSp:(NSString *)timeStr { long time; NSDateFormatter *format=[[NSDateFormatter alloc] init]; [format setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSDate *fromdate=[format dateFromString:timeStr]; time= (long)[fromdate timeIntervalSince1970]; NSLog(@"%ld",time); return time; }  //获取当前系统的yyyy-MM-dd HH:mm:ss格式时间 -(NSString *)getTime { NSDate *fromdate=[NSDate date]; NSDateFormatter *dateFormat=[[NSDateFormatter alloc]init]; [dateFormat setDateFormat:@"yyyy-MM-dd HH:mm:ss"]; NSString* string=[dateFormat stringFromDate:fromdate]; return string; }  //将当前时间转化为年月日格式 -(NSString *)changeDate { NSDate *date = [NSDate date]; NSCalendar *calendar = [[NSCalendar alloc] initWithCalendarIdentifier:NSGregorianCalendar]; NSInteger unitFlags =  NSYearCalendarUnit | NSMonthCalendarUnit | NSDayCalendarUnit | NSWeekdayCalendarUnit | NSHourCalendarUnit | NSMinuteCalendarUnit | NSSecondCalendarUnit;  NSDateComponents *comps = [calendar components:unitFlags fromDate:date]; NSInteger year = [comps year]; NSInteger month = [comps month]; NSInteger day = [comps day]; NSInteger hour = [comps hour]; NSInteger min = [comps minute]; NSInteger sec = [comps second];  NSString *string = [NSString stringWithFormat:@"%d年%d月%d日%d时%d分%d秒",year,month,day,hour,min,sec];  NSLog(@"%@",string); return string; } *///发送数据时,16进制数－>Byte数组->NSData,加上校验码部分-(NSData *)hexToByteToNSData:(NSString *)str{    int j=0;    Byte bytes[[str length]/2];                         ////Byte数组即字节数组,类似于C语言的char[],每个汉字占两个字节，每个数字或者标点、字母占一个字节    for(int i=0;i<[str length];i++)    {        /**         *  在iphone/mac开发中，unichar是两字节长的char，代表unicode的一个字符。         *  两个单引号只能用于char。可以采用直接写文字编码的方式来初始化。采用下面方法可以解决多字符问题         */        int int_ch;                                     ///两位16进制数转化后的10进制数        unichar hex_char1 = [str characterAtIndex:i];   ////两位16进制数中的第一位(高位*16)                        int int_ch1;        if(hex_char1 >= '0' && hex_char1 <='9')        {            int_ch1 = (hex_char1-48)*16;                //// 0 的Ascll - 48        }        else if(hex_char1 >= 'A' && hex_char1 <='F')        {            int_ch1 = (hex_char1-55)*16;                //// A 的Ascll - 65        }        else        {            int_ch1 = (hex_char1-87)*16;                //// a 的Ascll - 97        }                i++;                unichar hex_char2 = [str characterAtIndex:i];   ///两位16进制数中的第二位(低位)        int int_ch2;        if(hex_char2 >= '0' && hex_char2 <='9')        {            int_ch2 = (hex_char2-48);                   //// 0 的Ascll - 48        }        else if(hex_char2 >= 'A' && hex_char2 <='F')        {            int_ch2 = hex_char2-55;                     //// A 的Ascll - 65        }        else        {            int_ch2 = hex_char2-87;                     //// a 的Ascll - 97        }                int_ch = int_ch1+int_ch2;        bytes[j] = int_ch;                              ///将转化后的数放入Byte数组里        //        if (j==[str length]/2-2) {//            int k=2;//            int_ch=bytes[0]^bytes[1];//            while (k//                int_ch=int_ch^bytes[k];//                k++;//            }//            bytes[j] = int_ch;//        }                j++;    }    NSData *newData = [[NSData alloc] initWithBytes:bytes length:[str length]/2 ];    NSLog(@"%@",newData);    return newData;}//接收数据时,NSData－>Byte数组->16进制数-(NSString *)NSDataToByteTohex:(NSData *)data{    Byte *bytes = (Byte *)[data bytes];    NSString *hexStr=@"";    for(int i=0;i<[data length];i++)    {        NSString *newHexStr = [NSString stringWithFormat:@"%x",bytes[i]&0xff];///16进制数,与 0xff 做 & 运算会将 byte 值变成 int 类型的值，也将 -128～0 间的负值都转成正值了。        if([newHexStr length]==1)        {            hexStr = [NSString stringWithFormat:@"%@0%@",hexStr,newHexStr];        }        else        {            hexStr = [NSString stringWithFormat:@"%@%@",hexStr,newHexStr];        }    }    NSLog(@"hexStr:%@",hexStr);    return hexStr;}//将汉字字符串转换成16进制字符串-(NSString *)chineseToHex:(NSString*)chineseStr{    NSStringEncoding encodingGB18030= CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);    NSData *responseData =[chineseStr dataUsingEncoding:encodingGB18030 ];    NSString *string=[self NSDataToByteTohex:responseData];    NSLog(@"%@",string);    return string;}//将汉字字符串转换成UTF8字符串-(NSString *)chineseToUTf8Str:(NSString*)chineseStr{    NSStringEncoding encodingUTF8 = NSUTF8StringEncoding;    NSData *responseData2 =[chineseStr dataUsingEncoding:encodingUTF8 ];    NSString *string=[self NSDataToByteTohex:responseData2];    return string;}//将十六进制字符串转换成汉字-(NSString*)changeLanguage:(NSString*)chinese{    NSString *strResult;    NSLog(@"chinese:%@",chinese);    if (chinese.length%2==0)    {        //第二次转换        NSData *newData = [self hexToByteToNSData:chinese];        unsigned long encode = CFStringConvertEncodingToNSStringEncoding(kCFStringEncodingGB_18030_2000);        strResult = [[NSString alloc] initWithData:newData encoding:encode];        NSLog(@"strResult:%@",strResult);    }    else    {        NSString *strResult = @"已假定是汉字的转换，所传字符串的长度必须是4的倍数!";        NSLog(@"%@",strResult);        return NULL;    }    return strResult;}/////////////GBK,汉字，GB2312,ASCII码，UTF8,UTF16//UTF8字符串转换成汉字-(NSString*)changeLanguageUTF8:(NSString*)chinese{    NSString *strResult;    NSData *data=[self hexToByteToNSData:chinese];    strResult=[[NSString alloc]initWithData:data encoding:NSUTF8StringEncoding];    return strResult;}//将十进制数转换成十六进制-(NSString *)ToHex:(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;}//Unicode转化为汉字- (NSString *)replaceUnicode1:(NSString *)unicodeStr{    NSString *tempStr1 = [unicodeStr stringByReplacingOccurrencesOfString:@"\\u" withString:@"\\U"];    NSString *tempStr2 = [tempStr1 stringByReplacingOccurrencesOfString:@"\"" withString:@"\\\""];    NSString *tempStr3 = [[@"\"" stringByAppendingString:tempStr2] stringByAppendingString:@"\""];    NSData *tempData = [tempStr3 dataUsingEncoding:NSUTF8StringEncoding];    NSString* returnStr = [NSPropertyListSerialization propertyListFromData:tempData                                                           mutabilityOption:NSPropertyListImmutable                                                                     format:NULL                                                           errorDescription:NULL];        NSLog(@"%@",[returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"]);        return [returnStr stringByReplacingOccurrencesOfString:@"\\r\\n" withString:@"\n"];}//iso8859－1 到 unicode编码转换       iso8859-1字符编码的一种/*- (NSString *)changeISO88591StringToUnicodeString:(NSString *)iso88591String{    NSMutableString *srcString = [[NSMutableString alloc]initWithString:iso88591String];    [srcString replaceOccurrencesOfString:@"&" withString:@"&" options:NSLiteralSearch range:NSMakeRange(0, [srcString length])];    [srcString replaceOccurrencesOfString:@"&#x" withString:@"" options:NSLiteralSearch range:NSMakeRange(0, [srcString length])];    NSMutableString *desString = [[NSMutableString alloc]init];    NSArray *arr = [srcString componentsSeparatedByString:@";"];    //将字符串切割成数组    for(int i=0;i<[arr count]-1;i++)    {        NSString *v = [arr objectAtIndex:i];        char *c = malloc(3);        int value = [StringUtil changeHexStringToDecimal:v];//将二进制转化为十进制        c[1] = value  &0x00FF;        c[0] = value >>8 &0x00FF;        c[2] = '\0';        [desString appendString:[NSString stringWithCString:c encoding:NSUnicodeStringEncoding]];        free(c);    }    return desString;} */