Разобрать PFUser QueryWithPredicate Не работает

Во-первых, ваш объект, вот как вы это настраиваете, пример:

Книга.ч

#import <Foundation/Foundation.h>

@interface Book : NSObject

@property (strong, nonatomic)NSString *bookID;
@property (strong, nonatomic)NSString *publishingYear;
@property (strong, nonatomic)NSString *author;
@property (strong, nonatomic)NSString *printHouse;
@property (strong, nonatomic)NSString *title;
@property (strong, nonatomic)NSString *ISBN;

-(id)initWithBookObjectId:(NSString *)bookID
           publishingYear:(NSString *)publishingYear
                   author:(NSString *)author
               printHouse:(NSString *)printHouse
                    title:(NSString *)title
                     ISBN:(NSString *)ISBN;

- (id)initWithDictionary:(PFObject *)dic;

@end

Книга.м

#import "Book.h"
#define NSHNullCheck(object) ([object isKindOfClass:[NSNull class]] ? nil : object)

@implementation Book
{
    NSDictionary * descriptionDict;
}

-(id)initWithBookObjectId:(NSString *)bookID
           publishingYear:(NSString *)publishingYear
                   author:(NSString *)author
               printHouse:(NSString *)printHouse
                    title:(NSString *)title
                     ISBN:(NSString *)ISBN;

{
    self = [super init];
    if (self) {
        _bookID = bookID;
        _publishingYear = publishingYear;
        _author = author;
        _printHouse = printHouse;
        _title = title;
        _ISBN = ISBN;}
    return self;
}

- (id)initWithDictionary:(PFObject *)dic
{
    self = [self initWithBookObjectId:dic.objectId
                       publishingYear:NSHNullCheck([dic  valueForKey:@"publishingYear"])
                               author:NSHNullCheck([dic  valueForKey:@"author"])
                           printHouse:NSHNullCheck([dic  valueForKey:@"printHouse"])
                                title:NSHNullCheck([dic  valueForKey:@"title"])
                                 ISBN:NSHNullCheck([dic  valueForKey:@"ISBN"])];


    descriptionDict = @{ @"sessionObjectId":_bookID,
                         @"teacherAge":_publishingYear,
                         @"teacherEmail":_author,
                         @"teacherFacebookuniquekey":_printHouse,
                         @"teacherFirstname":_title,
                         @"teacherGender":_ISBN};
    return self;
}

- (id)init
{
    self = [self initWithBookObjectId:nil
                       publishingYear:nil
                               author:nil
                           printHouse:nil
                                title:nil
                                ISBN:nil];
    return self;
}

- (NSString *)description
{
    return descriptionDict.description;
}

@end

Хранение данных в объектной модели: books — это массив, содержащий ваши «книжные объекты». Следующий фрагмент кода используется везде, где вы извлекаете данные из сети с помощью запроса от Parse.

for (PFObject *object in objects) { //"objects" here is the NSArrray returned from the parse query!
    Book *book = [[Book alloc] initWithBookObjectId:object.objectId];
    book.publishingYear = object[@"publishingYear"];
    book.author = object[@"author"];
    book.printHouse = object[@"printHouse"];
    book.title = object[@"title"];
    book.ISBN = object[@"isbn"];
    [self.books addObject:book];
}
if ([self.searchTerm isEqualToString:@""]) {
    self.filteredBooksArray = self.books;
} else {
    NSPredicate *predicate = [NSPredicate predicateWithFormat:@"SELF.title contains[c] %@",self.searchTerm];
    self.filteredBooksArray = [NSMutableArray arrayWithArray:[self.books filteredArrayUsingPredicate:predicate]];
}
[self.booksTable reloadData];

Итак, вот как вы выполняете поиск с помощью PFObjects: сначала вам нужно извлечь данные, сохранить эти данные внутри подкласса NSObject (объектная модель данных), а затем использовать предикаты регулярных выражений, как в любой объектной модели с функцией поиска в IOS. .

Есть такой метод:

PFQuery *query = [PFQuery queryWithClassName:@"Post"]
[query whereKey:@"hashtags" containsAllObjectsInArray:@[@"#parse", @"#ftw"]];
NSArray *parseFTWPosts = [query findObjects];

а затем этот метод:

/ Using PFQuery
 [query whereKey:@"playerName" notEqualTo:@"Michael Yabuti"];
 [query whereKey:@"playerAge" greaterThan:@18];

 // Using NSPredicate
 NSPredicate *predicate = [NSPredicate predicateWithFormat: @"playerName != 'Michael Yabuti' AND playerAge > 18"];
 PFQuery *query = [PFQuery queryWithClassName:@"GameScore" predicate:predicate];

а затем этот фрагмент:

Specifying Constraints with NSPredicate

To get the most out of PFQuery we recommend using its methods listed below to add constraints. However, if you prefer using NSPredicate, a subset of the constraints can be specified by providing an NSPredicate when creating your PFQuery.

NSPredicate *predicate = [NSPredicate predicateWithFormat:@"playerName = 'Dan Stemkosk'"];
PFQuery *query = [PFQuery queryWithClassName:@"GameScore" predicate:predicate];

let predicate = NSPredicate(format: "playerName = 'Dan Stemkosk'")
var query = PFQuery(className: "GameScore", predicate: predicate)

These features are supported:

    Simple comparisons such as =, !=, <, >, <=, >=, and BETWEEN with a key and a constant.
    Containment predicates, such as x IN {1, 2, 3}.
    Key-existence predicates, such as x IN SELF.
    BEGINSWITH expressions.
    Compound predicates with AND, OR, and NOT.
    Sub-queries with "key IN %@", subquery.

The following types of predicates are not supported:

    Aggregate operations, such as ANY, SOME, ALL, or NONE.
    Regular expressions, such as LIKE, MATCHES, CONTAINS, or ENDSWITH.
    Predicates comparing one key to another.
    Complex predicates with many ORed clauses.

и еще здесь:

https://github.com/ParsePlatform/Docs/blob/master/en/ios/queries.mdown