# NSPredicate

# Filter By Name

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]);

# Find movies except given ids

// *** 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]);

# Find all the objects which is of type movie

// *** 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]);

# Find Distinct object ids of array

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

# Find movies with specific ids

// *** 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]);

# Case Insensitive comparison with exact title match

// *** 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]);

# Case sensitive with exact title match

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

# Case Insensitive comparison with matching subset

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

# Syntax

CONTAINS operator : It allows to filter objects with matching subset. `NSPredicate *filterByName = [NSPredicate predicateWithFormat:@"self.title CONTAINS[cd] %@",@"Tom"];`

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

= operator : It returns all the objects with matching filter value. `NSPredicate *filterByNameCS = [NSPredicate predicateWithFormat:@"self.title = %@",@"Tom and Jerry"];`

IN operator : It allows you to filter objects with specific filter set. `NSPredicate *filterByIds = [NSPredicate predicateWithFormat:@"self.id IN %@",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]];`

NOT IN operator : It allows you to find Inverse objects with specific set. `NSPredicate *filterByNotInIds = [NSPredicate predicateWithFormat:@"NOT (self.id IN %@)",@[@"7CDF6D22-8D36-49C2-84FE-E31EECCECB79", @"7CDF6D22-8D36-49C2-84FE-E31EECCECB76"]];`

# Remarks

For more details read NSPredicate in Apple documentation (opens new window)

← NSData NSRegularExpression →