An example for class equality method implementation

iOS - Equality.h

@interface FGEntityLine : NSObject

@property (readonly, nonatomic) NSUInteger companyId;
@property (readonly, nonatomic) NSUInteger brandId;
@property (readonly, nonatomic) NSUInteger propertyId;

/** Returns YES if all identifiers are equal. */
- (BOOL)isEqualToEntityLine:(FGEntityLine *)line;

@end

iOS - Equality.m

@implementation FGEntityLine

#pragma mark - equality

- (BOOL)isEqualToEntityLine:(FGEntityLine *)line {
    if (!line) {
        return NO;
    }
    BOOL haveSameKindOfClass = [self isKindOfClass:line.class];
    BOOL haveEqualIdentifiers = (self.companyId == line.companyId) && (self.brandId == line.brandId) && (self.propertyId == line.propertyId);
    return haveSameKindOfClass && haveEqualIdentifiers;
}

- (BOOL)isEqual:(id)object {
    if (self == object) {
        return YES;
    }
    return [self isEqualToEntityLine:(FGEntityLine *)object];
}

- (NSUInteger)hash {
    return self.companyId ^ self.brandId ^ self.propertyId;
}

@end