iOS does not differentiate between string-case comparisons

1NSString *str;2         //using stringWithFormat to generate a formatted string3str = [NSString stringWithFormat:@"This is %@","John"];4NSLog (@"STR--->%@", str);5         //string lengths length;6NSLog (@"The length of this string is%@", [str length]);7         //string comparison isequaltostring, return no (false), isequaltostring case-sensitive8BOOL isequal = [str isequaltostring:@"This is John"];9          Ten         //The string sequence is compare than the column and returns the result Nscomparisonresult One         //type enum _nscomparisonresult{ A         //nsorderedascending =-1, -         //Nsorderedsame, -         //nsordereddescending the         // } -         intresult = [@"BOOL"Compare@"Cool"]; -NSLog (@"The result is%d", result); -           +         //Compare comparison rules options -         //Nsliteralsearch Case-sensitive (full comparison) +         //Nscaseinsensitivesearch Case insensitive A         //Nsnumericsearch compares only the number of strings, not the literal value of a string at         intRESULT1 = [@"This is John"Compare@"This is John"Options:nscaseinsensitivesearch |Nsnumericsearch]; -NSLog (@"The result is%d", RESULT1); -           -         //whether the beginning of the string includes another string hasprefix, returns the result Yes (true) -BOOL Ishas = [str hasprefix:@" This"]; -         //whether the end of the string includes another string hassuffix, returns the result Yes (true) inBOOL Ishas = [str hassuffix:@"John"]; -           to         //find the position of a string in another string +Nsrange range = [str rangeofstring:@" is"Options:nscaseinsensitivesearch]; -NSLog (@"The location of the string named ' str ' of ' was ' is @d", range.location);

iOS does not differentiate between string-case comparisons