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在项目中整理的一些关于字符串应用方法，可以全部封装在一个类里面进行调用，会不断更新添加：
1.数字转换成对应的中文数字（项目中课程分级目录的章节号用到）
摘自：http://blog.csdn.net/it_ds/article/details/47128563
+(NSString *)translation:(NSString *)arebic
{ NSString *str = arebic;
NSArray *arabic_numerals = @[@"1",@"2",@"3",@"4",@"5",@"6",@"7",@"8",@"9",@"0"];
NSArray *chinese_numerals = @[@"一",@"二",@"三",@"四",@"五",@"六",@"七",@"八",@"九",@"零"];
NSArray *digits = @[@"个",@"十",@"百",@"千",@"万",@"十",@"百",@"千",@"亿",@"十",@"百",@"千",@"兆"];
NSDictionary *dictionary = [NSDictionary dictionaryWithObjects:chinese_numerals forKeys:arabic_numerals];
NSMutableArray *sums = [NSMutableArray array];
for (int i = 0; i < str.length; i ++) {
NSString *substr = [str substringWithRange:NSMakeRange(i, 1)];
NSString *a = [dictionary objectForKey:substr];
NSString *b = digits[str.length -i-1];
NSString *sum = [a stringByAppendingString:b];
if ([a isEqualToString:chinese_numerals[9]])
{
if([b isEqualToString:digits[4]] || [b isEqualToString:digits[8]])
{
sum = b;
if ([[sums lastObject] isEqualToString:chinese_numerals[9]])
{
[sums removeLastObject];
}
}else
{
sum = chinese_numerals[9];
}
if ([[sums lastObject] isEqualToString:sum])
{
continue;
}
}
[sums addObject:sum];
}
NSString *sumStr = [sums componentsJoinedByString:@""];
NSString *chinese = [sumStr substringToIndex:sumStr.length-1];
NSLog(@"%@",str);
NSLog(@"%@",chinese);
return chinese;
}
2.判断是否含有中文（视频网址判断是否需要转码）
+(BOOL)isChinese:(NSString *)str{
for (int i=0; i<str.length; ++i)
{
NSRange range = NSMakeRange(i, 1);
NSString *subString = [str substringWithRange:range];
const char *cString = [subString UTF8String];
if (strlen(cString) == 3)
{
return YES;
}
}
return NO;
}
3.去除特殊字符（去除时间戳中的”/“时用到）
+(NSString *) stringDeleteString:(NSString *)str
{
NSMutableString *str1 = [NSMutableString stringWithString:str];
for (int i = 0; i < str1.length; i++) {
unichar c = [str1 characterAtIndex:i];
NSRange range = NSMakeRange(i, 1);
if ( c == ‘/‘ || c == ‘-‘ || c == ‘.‘ || c == ‘,‘ || c == ‘(‘ || c == ‘)‘) { //此处可以是任何字符
[str1 deleteCharactersInRange:range];
--i;
}
}
NSString *newstr = [NSString stringWithString:str1];
return newstr;
}
4.特殊字符转义（textView往接口传入含”&“的内容不能成功 因为接口参数以”&“开头 解决方式是移动端将输入内容先转义 然后后台再转一次）
+(NSString *)replaceMyString:(NSString *)textStr{
// NSString *inputString = [[NSString alloc]init];
NSString *inputString = textStr;
//inputString = [inputString stringByAddingPercentEscapesUsingEncoding:NSUTF8StringEncoding];
inputString = [inputString stringByReplacingOccurrencesOfString:@"&" withString:@"&"];
inputString = [inputString stringByReplacingOccurrencesOfString:@"<" withString:@"<"];
inputString = [inputString stringByReplacingOccurrencesOfString:@">" withString:@">"];
inputString = [inputString stringByReplacingOccurrencesOfString:@" " withString:@" "];
inputString = [inputString stringByReplacingOccurrencesOfString:@"\‘" withString:@"‘"];
inputString = [inputString stringByReplacingOccurrencesOfString:@"\"" withString:@"""];
inputString = [inputString stringByReplacingOccurrencesOfString:@"\r" withString:@""];
inputString = [inputString stringByReplacingOccurrencesOfString:@"\n" withString:@"<br />"];
return inputString;
}
5.将秒数转换成时、分（接口返回的时长都是秒单位 如3600 需要转成小时和分钟的样式时用到）
//修改时分的方法
+(NSString *)TimeformatFromSeconds:(int)seconds
{
if (seconds > 60 ) {
NSString *str_hour = [NSString stringWithFormat:@"%d",seconds/3600];
NSString *str_minute = [NSString stringWithFormat:@"%d",(seconds%3600)/60];
if([str_hour isEqualToString:@"0"] )
{
int minutInt = (seconds%3600)%60;
if (minutInt != 0) {
NSString *format_time = [NSString stringWithFormat:@"%d",[str_minute intValue]+1];
return format_time;
}else{
NSString *format_time = [NSString stringWithFormat:@"%@",str_minute];
return format_time;
}
}else
{
int minutInt = (seconds%3600)%60;
if (minutInt != 0) {
NSString *format_time = [NSString stringWithFormat:@"%@时%d",str_hour,[str_minute intValue]+1];
return format_time;
}else{
NSString *format_time = [NSString stringWithFormat:@"%@时%@",str_hour,str_minute];
return format_time;
}
}
}else if(seconds == 0)
{
return @"0";
}
else{
return @"1";
}
}
6.获取文件的大小（下载课程视频获取大小时用到）
//返回文件大小的方法
+(NSString *)getFileSizeString:(CGFloat)size
{
if (size>1024*1024*1024){
return [NSString stringWithFormat:@"%.1fG",size/1024/1024/1024];//大于1G，则转化成G单位的字符串
}
else if(size<1024*1024*1024&&size>=1024*1024)//大于1M，则转化成M单位的字符串
{
return [NSString stringWithFormat:@"%.1fM",size/1024/1024];
}
else if(size>=1024&&size<1024*1024) //不到1M,但是超过了1KB，则转化成KB单位
{
return [NSString stringWithFormat:@"%.1fK",size/1024];
}
else//剩下的都是小于1K的，则转化成B单位
{
return [NSString stringWithFormat:@"%.1fB",size];
}
}
7.计算时间差（事前保存的时间与当前时间差 用于课程更新时间的显示）
+(NSString *)compareCurrentTime:(NSDate*)compareDate { NSTimeInterval timeInterval = [compareDate timeIntervalSinceNow]; timeInterval = -timeInterval; long temp = 0; NSString *result; NSLog(@"timeInterval：%f ",timeInterval); if (timeInterval < 60) { result = [NSString stringWithFormat:@"刚刚"]; } else if((temp = timeInterval/60) <60){ result = [NSString stringWithFormat:@"%ld分前",temp]; } else if((temp = temp/60) <24){ result = [NSString stringWithFormat:@"%ld小前",temp]; } else if((temp = temp/24) <30){ result = [NSString stringWithFormat:@"%ld天前",temp]; } else if((temp = temp/30) <12){ result = [NSString stringWithFormat:@"%ld月前",temp]; } else{ temp = temp/12; result = [NSString stringWithFormat:@"%ld年前",temp]; } return result; }
8.字符串转进制 （给后台提交数据时有用到）
//字符串转16进制
+(NSString *)unicoStr:(NSString *)text
{
NSString *hexstr = @"";
for (int i=0;i< [text length];i++)
{
hexstr = [hexstr stringByAppendingFormat:@"%@",[NSString stringWithFormat:@"0x%1X ",[text characterAtIndex:i]]];
}
return hexstr;
}
//字符串转8进制
+(NSString *)eightUnicoStr:(NSString *)text
{
NSString *hexstr = @"";
// int slen = strlen([text UTF8String]);
for (int i = 0; i < text.length; i++)
{
//fffffff0 去除前面六个F & 0xFF
hexstr = [hexstr stringByAppendingFormat:@"%@",[NSString stringWithFormat:@"0x%X ",[text UTF8String][i] & 0xFF ]];
}
return hexstr;
}
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原文地址：http://www.cnblogs.com/wusang/p/5601733.html
