Monday, May 20, 2013

NSString NSCaseInsensitiveSearch example ios

Search and Comparison Options - NSCaseInsensitiveSearch

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
A case-insensitive search.
Exact character-by-character equivalence.
Search from end of source string.[NSString NSCaseInsensitiveSearch]
Search is limited to start (or end, if NSBackwardsSearch) of source string.
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.
Search ignores diacritic marks.[NSString NSCaseInsensitiveSearch]
For example, ‘ö’ is equal to ‘o’.
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).
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.
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 NSCaseInsensitiveSearch]
See “Searching, Comparing, and Sorting Strings” for details on the effects of these options.

Example of [NSString NSCaseInsensitiveSearch]

NSArray *array = [NSArray arrayWithObjects:@"éli", @"bob", @"earl", @"allen", @"àli", @"aaron", nil];

NSArray *sorted = [array sortedArrayUsingComparator:^NSComparisonResult(id obj1, id obj2) {
    return [(NSString*)obj1 compare:obj2 options:NSDiacriticInsensitiveSearch|NSCaseInsensitiveSearch];

Example of [NSString NSCaseInsensitiveSearch]
@implementation NSString (YourCategory)

- (NSComparisonResult) compareTheAddressBookWay:(NSString*)iString
    return [self compare:iString 

Example of [NSString NSCaseInsensitiveSearch]
NSString *someString = @"Here is my string";
NSRange isRange = [someString rangeOfString:@"is " options:NSCaseInsensitiveSearch];
if(isRange.location == 0) {
   //found it...
} else {
   NSRange isSpacedRange = [someString rangeOfString:@" is " options:NSCaseInsensitiveSearch];
   if(isSpacedRange.location != NSNotFound) {
      //found it...