#import "Person.h" @implementation Person - (NSArray *)personKeys { return @[@"firstName", @"lastName", @"bloodType", @"age"]; } @end #import "ViewController.h" #import "Person.h" @interface ViewController () @property (strong, nonatomic) NSArray *personData; @end @implementation ViewController - (NSArray *)personData { NSMutableArray *persons = [NSMutableArray array]; NSDictionary *person1 = @{@"
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