Monday, May 20, 2013

NSString NSDiacriticInsensitiveSearch example ios


Search and Comparison Options - NSDiacriticInsensitiveSearch

These values represent the options available to many of the string classes’ search and comparison methods.
enum {
   NSCaseInsensitiveSearch = 1,
   NSLiteralSearch = 2,
   NSBackwardsSearch = 4,
   NSAnchoredSearch = 8,
   NSNumericSearch = 64,
   NSDiacriticInsensitiveSearch = 128,
   NSWidthInsensitiveSearch = 256,
   NSForcedOrderingSearch = 512,
   NSRegularExpressionSearch = 1024
};
Constants
NSCaseInsensitiveSearch
A case-insensitive search.
NSLiteralSearch
Exact character-by-character equivalence.
NSBackwardsSearch
Search from end of source string.[NSString NSDiacriticInsensitiveSearch]
NSAnchoredSearch
Search is limited to start (or end, if NSBackwardsSearch) of source string.
NSNumericSearch
Numbers within strings are compared using numeric value, that is, Name2.txt <Name7.txt < Name25.txt.
This option only applies to compare methods, not find.
NSDiacriticInsensitiveSearch
Search ignores diacritic marks.[NSString NSDiacriticInsensitiveSearch]
For example, ‘ö’ is equal to ‘o’.
NSWidthInsensitiveSearch
Search ignores width differences in characters that have full-width and half-width forms, as occurs in East Asian character sets.
For example, with this option, the full-width Latin small letter 'a' (Unicode code point U+FF41) is equal to the basic Latin small letter 'a' (Unicode code point U+0061).
NSForcedOrderingSearch
Comparisons are forced to return either NSOrderedAscending orNSOrderedDescending if the strings are equivalent but not strictly equal.
This option gives stability when sorting. For example, “aaa” is greater than "AAA” if NSCaseInsensitiveSearch is specified.
NSRegularExpressionSearch
The search string is treated as an ICU-compatible regular expression. If set, no other options can apply except NSCaseInsensitiveSearch and NSAnchoredSearch. You can use this option only with the rangeOfString:...methods and stringByReplacingOccurrencesOfString:withString:options:range:.
Discussion of [NSString NSDiacriticInsensitiveSearch]
See “Searching, Comparing, and Sorting Strings” for details on the effects of these options.


Example of [NSString NSDiacriticInsensitiveSearch]

// should return NSOrderedSame, i.e. identical
[@"Apple" compare:@"Ápple" 
          options:NSDiacriticInsensitiveSearch]
If you want it to be case-insensitive as well:
// ditto
[@"Apple" compare:@"Ápple" 
          options:NSDiacriticInsensitiveSearch | NSCaseInsensitiveSearch] 
Example of [NSString NSDiacriticInsensitiveSearch]
NSString *accentedString = @"ÁlgeBra";
NSString *unaccentedString = [accentedString stringByFoldingWithOptions:NSDiacriticInsensitiveSearch locale:[NSLocale currentLocale]];
NSString *capitalizedString = [unaccentedString capitalizedString];
Example of [NSString NSDiacriticInsensitiveSearch]
NSStringCompareOptions  compareOptions = NSDiacriticInsensitiveSearch;
NSArray* countryIndex = [[NSArray alloc] initWithObjects:@"alpha", @"beta", @"gamma' nil];

for (NSString* element in countryIndex) {
    NSInteger result = [(NSString *)country compare:element options:compareOptions];
    if(NSOrderedAscending == result) {
        // Do something here...
    }
    else if (NSOrderedSame == result) {
        // Do another thing here if they match...
    }
    else {
        // Try something else...
    }
}