Some methods of IOS about NSString

Some of the string application methods that are organized in the project can be encapsulated in a single class for invocation and are constantly updated to add:

1. The numbers are converted into corresponding Chinese numerals (the chapter number of the course grading catalogue in the project is used)

Excerpt from: 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 = @[@ "One", @ "two", @ "three", @ "four", @ "five", @ "six", @ "seven", @ "eight", @ "nine" @ "0"];    Nsarray *digits = @[@ "A", @ "ten", @ "hundred", @ "thousand", @ "Million", @ "ten", @ "hundred", @ "thousand", @ "Million", @ "ten", @ "hundred", @ "thousand", @ "Mega"];    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. Decide whether to include Chinese (video URL to determine if transcoding is required)

+ (BOOL) Ischinese: (NSString *) str{for    (int i=0; i<str.length; ++i)    {        Nsrange range = Nsmakerange (i, 1); c4/>nsstring *substring = [str substringwithrange:range];        const char *cstring = [subString utf8string];        if (strlen (cString) = = 3)        {            return YES;        }    }    return NO;}

3. Remove special characters (used when "/" in time stamp is removed)

+ (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 = = ') ') {//* This can be any character            [str1 Deletecharactersinrange : Range];            -----;}    }    NSString *newstr = [NSString stringwithstring:str1];    return NEWSTR;}

4. Special character escaping (TextView to interface with "&" cannot be successful because the interface parameter begins with "&" The solution is that the mobile side first escapes the input and then turns the background one more time)

+ (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. Converts the number of seconds to hours, minutes (the length of time that the interface returns is a unit of seconds, such as 3600 when you need to turn into hour and minute styles)

method to modify Time division + (NSString *) Timeformatfromseconds: (int) seconds{if (seconds >) {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:@ "%@ when%d", Str_hour,[str_minute Intva                LUE]+1];            return format_time; }else{nsstring *format_time = [NSString stringwithformat:@]%@%@ ", Str_hour,str_minute];            return format_time;    }}}else if (seconds = = 0) {return @ "0";    } else{return @ "1"; }}

6. Get the size of the file (used when downloading the course video to get the size)

Ways to return file size
+ (NSString *) getfilesizestring: (cgfloat) size
{
if (size>1024*1024*1024) {
return [NSString stringwithformat:@ "%.1FG", size/1024/1024/1024];//greater than 1G, convert to G-Unit string
}
else if (size<1024*1024*1024&&size>=1024*1024)//greater than 1M, convert to M-unit string
{
return [NSString stringwithformat:@ "%.1FM", size/1024/1024];
}
else if (size>=1024&&size<1024*1024)//less than 1M, but more than 1KB, convert to KB units
{
return [NSString stringwithformat:@ "%.1FK", size/1024];
}
else//the remainder is less than 1K, it is converted into B units
{
return [NSString stringwithformat:@ "%.1FB", size];
}
}

7. Calculate the time difference (pre-save and the current time difference for the display of the course update times)

+ (NSString *) Comparecurrenttime: (nsdate*) comparedate{nstimeinterval timeinterval=[Comparedate Timeintervalsincenow]; TimeInterval= -timeinterval; Longtemp =0; NSString*result; NSLog (@"timeinterval:%f", timeinterval); if(TimeInterval < -) {result= [NSString stringWithFormat:@"just"]; }    Else if(temp = timeinterval/ -) < -) {result= [NSString stringWithFormat:@"%ld minutes ago", temp]; }    Else if(temp = temp/ -) < -) {result= [NSString stringWithFormat:@"%ld Small Front", temp]; }    Else if(temp = temp/ -) < -) {result= [NSString stringWithFormat:@"%ld days ago", temp]; }    Else if(temp = temp/ -) < A) {result= [NSString stringWithFormat:@"%ld months ago", temp]; }    Else{Temp= temp/ A; Result= [NSString stringWithFormat:@"%ld years ago", temp]; }    returnresult; }

8. String transcoding (useful for submitting data in the background)

String to 16 binary + (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;} String to 8 binary + (NSString *) Eightunicostr: (NSString *) text{    nsstring *hexstr = @ "";//    int slen = strlen ([text Utf8string]);    for (int i = 0; i < text.length; i++)    {        //fffffff0 remove front six F & 0xFF        hexstr = [Hexstr stringbyappending format:@ "%@", [NSString stringwithformat:@ "0x%X", [Text Utf8string][i] & 0xFF];    }    return hexstr;}

Some methods of IOS about NSString