Objective-C Language
NSPredicate

Sintassi

• Operatore CONTAINS: consente di filtrare gli oggetti con sottoinsieme corrispondente.

  NSPredicate *filterByName = [NSPredicate predicateWithFormat:@"self.title CONTAINS[cd] %@",@"Tom"];

• LIKE: Il suo semplice filtro di confronto.

  NSPredicate *filterByNameCIS = [NSPredicate predicateWithFormat:@"self.title LIKE[cd] %@",@"Tom and Jerry"];

• = operatore: restituisce tutti gli oggetti con il valore del filtro corrispondente.

  NSPredicate *filterByNameCS = [NSPredicate predicateWithFormat:@"self.title = %@",@"Tom and Jerry"];

• Operatore IN: consente di filtrare gli oggetti con un set di filtri specifico.

  NSPredicate *filterByIds = [NSPredicate predicateWithFormat:@"self.id IN %@",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]];

• Operatore NOT IN: consente di trovare oggetti inversi con set specifici.

  NSPredicate *filterByNotInIds = [NSPredicate predicateWithFormat:@"NOT (self.id IN %@)",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]];

Osservazioni

Filtra per nome

NSArray *array = @[
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB71",
                        @"title": @"Jackie Chan Strike Movie",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB72",
                        @"title": @"Sherlock homes",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @0
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB73",
                        @"title": @"Titanic",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB74",
                        @"title": @"Star Wars",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB75",
                        @"title": @"Pokemon",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @0
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76",
                        @"title": @"Avatar",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB77",
                        @"title": @"Popey",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB78",
                        @"title": @"Tom and Jerry",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    },
                    @{
                        @"id": @"7CDF6D22-8D36-49C2-84FE-E31EECCECB79",
                        @"title": @"The wolf",
                        @"url": @"http://abc.com/playback.m3u8",
                        @"thumbnailURL": @"http://abc.com/thumbnail.png",
                        @"isMovie" : @1
                    }
                    ];

// *** Case Insensitive comparision with excate title match ***
NSPredicate *filterByNameCIS = [NSPredicate predicateWithFormat:@"self.title LIKE[cd] %@",@"Tom and Jerry"];
NSLog(@"Filter By Name(CIS) : %@",[array filteredArrayUsingPredicate:filterByNameCIS]);

Trova film tranne dati ID

// *** Find movies except given ids ***
NSPredicate *filterByNotInIds = [NSPredicate predicateWithFormat:@"NOT (self.id IN %@)",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]];
NSLog(@"Filter movies except given Ids : %@",[array filteredArrayUsingPredicate:filterByNotInIds]);

Trova tutti gli oggetti che sono di tipo film

// *** Find all the objects which is of type movie, Both the syntax are valid ***
NSPredicate *filterByMovieType = [NSPredicate predicateWithFormat:@"self.isMovie = %@",@1];
// OR
//NSPredicate *filterByMovieType = [NSPredicate predicateWithFormat:@"self.isMovie = %@",[NSNumber numberWithBool:YES]];
NSLog(@"Filter By Movie Type : %@",[array filteredArrayUsingPredicate:filterByMovieType]);

Trova distinti oggetti ID di matrice

// *** Find Distinct object ids of array ***
NSLog(@"Distinct id : %@",[array valueForKeyPath:@"@distinctUnionOfObjects.id"]);

Trova film con ID specifici

// *** Find movies with specific ids ***
NSPredicate *filterByIds = [NSPredicate predicateWithFormat:@"self.id IN %@",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]];
NSLog(@"Filter By Ids : %@",[array filteredArrayUsingPredicate:filterByIds]);

Confronto insensibile alle maiuscole / minuscole con corrispondenza esatta del titolo

// *** Case Insensitive comparison with exact title match ***
NSPredicate *filterByNameCIS = [NSPredicate predicateWithFormat:@"self.title LIKE[cd] %@",@"Tom and Jerry"];
NSLog(@"Filter By Name(CIS) : %@",[array filteredArrayUsingPredicate:filterByNameCIS]);

Maiuscole / minuscole con corrispondenza esatta del titolo

// *** Case sensitive with exact title match ***
NSPredicate *filterByNameCS = [NSPredicate predicateWithFormat:@"self.title = %@",@"Tom and Jerry"];
NSLog(@"Filter By Name(CS) : %@",[array filteredArrayUsingPredicate:filterByNameCS]);

Confronto insensibile alle maiuscole / minuscole con sottoinsieme corrispondente

// *** Case Insensitive comparison with matching subset ***
NSPredicate *filterByName = [NSPredicate predicateWithFormat:@"self.title CONTAINS[cd] %@",@"Tom"];
NSLog(@"Filter By Containing Name : %@",[array filteredArrayUsingPredicate:filterByName]);