NSComparisonPredicate NSDiacriticInsensitivePredicateOption example in Objective C (iOS).

NSComparisonPredicate NSDiacriticInsensitivePredicateOption

NSComparisonPredicate Options
These constants describe the possible types of string comparison for NSComparisonPredicate. These options are supported for LIKE as well as all of the equality/comparison operators.

enum {
NSCaseInsensitivePredicateOption = 0x01,
NSDiacriticInsensitivePredicateOption = 0x02,
NSNormalizedPredicateOption = 0x04,
NSLocaleSensitivePredicateOption = 0x08
};
typedef NSUInteger NSComparisonPredicateOptions;

Constants
NSCaseInsensitivePredicateOption
A case-insensitive predicate.
You represent this option in a predicate format string using a [c] following a string operation (for example, "NeXT" like[c] "next").
NSDiacriticInsensitivePredicateOption
A diacritic-insensitive predicate.
You represent this option in a predicate format string using a [d] following a string operation (for example, "naïve" like[d] "naive").
NSNormalizedPredicateOption
Indicates that the strings to be compared have been preprocessed.
This option supersedes NSCaseInsensitivePredicateOption and NSDiacriticInsensitivePredicateOption, and is intended as a performance optimization option.
You represent this option in a predicate format string using a [n] following a string operation (for example, "WXYZlan" matches[n] ".lan").
NSLocaleSensitivePredicateOption
Indicates that strings to be compared using <, <=, =, =>, > should be handled in a locale-aware fashion.
You represent this option in a predicate format string using a [l] following one of the <, <=, =, =>, > operators (for example, "straße" >[l] "strasse").

NSComparisonPredicate NSDiacriticInsensitivePredicateOption example.

NSExpression * leftExpression = [NSExpression expressionForKeyPath:@"name"];
NSExpression * rightExpression = [NSExpression expressionForConstantValue:@"Hello!"];

NSComparisonPredicate * predicate = [NSComparisonPredicate predicateWithLeftExpression:leftExpression
                                                                       rightExpression:rightExpression
                                                                              modifier:NSDirectPredicateModifier
                                                                                  type:NSContainsPredicateOperatorType
                                                                               options:(NSCaseInsensitivePredicateOption | NSDiacriticInsensitivePredicateOption)];

Example of [NSComparisonPredicate NSDiacriticInsensitivePredicateOption].

NSPredicate *nameQuery =
[NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"s_name"]
                                   rightExpression:[NSExpression expressionForConstantValue:Name]
                                          modifier:NSDirectPredicateModifier
                                              type:NSLikePredicateOperatorType
                                           options:NSCaseInsensitivePredicateOption|NSDiacriticInsensitivePredicateOption];

NSPredicate *regNoQuery =
[NSComparisonPredicate predicateWithLeftExpression:[NSExpression expressionForKeyPath:@"s_regno"]
                                   rightExpression:[NSExpression expressionForConstantValue:RegNo]
                                          modifier:NSDirectPredicateModifier
                                              type:NSEqualToPredicateOperatorType
                                           options:0];

NSPredicate *query = [NSCompoundPredicate andPredicateWithSubpredicates:@[nameQuery,regNoQuery]];

End of NSComparisonPredicate NSDiacriticInsensitivePredicateOption example article.