这次分享一些数据类型还有时间类型的各种转换方法，有详细注释，话不多说，直接上代码
/** * 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:tempDatamutabilityOption:NSPropertyListImmutableformat:NULLerrorDescription: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;} */
每一个成功者都有一个开始。勇于开始，才能找到成功的路。
