NSObject Return Null

Question

3 클래스가 있습니다. 그리고 나는 이것들 중 하나를 사용하려고 시도했지만 뭔가 잘못되었다는 것을 알고 있지만 잘못하고있는 것을 알아 내지 못했습니다. 이것은 내 코드입니다. 장소 클래스

@interface Venue : NSObject 

@property (nonatomic, strong) NSString *name; 
@property (nonatomic, strong) NSString *venueId; 
@property Location *location; 
@property Stats *stats; 

+(Venue*) sharedInstance; 
-(void)getVenues:(NSString*)ll :(NSString*)query completionHandler:(void (^)(NSMutableArray *array))completionHandler; 

@end 

위치 클래스

#import <Foundation/Foundation.h> 

@interface Location : NSObject 

@property (nonatomic, strong) NSString *address; 
@property (nonatomic, strong) NSString *city; 
@property (nonatomic, strong) NSString *lat; 
@property (nonatomic, strong) NSString *lng; 
@property (nonatomic, strong) NSString *crossStreet; 
@property NSNumber *distance; 
@property (nonatomic, strong) NSString *cc; 
@property (nonatomic, strong) NSString *country; 

@end 

그리고 통계 클래스

@interface Stats : NSObject 
@property NSNumber *usersCount; 
@property NSNumber *checkinsCount; 
@property NSNumber *tipCount; 
@end 

나는 위치와 통계를 할당하는 노력의 수익률이 null 값.

-(void)getVenues:(NSString*)ll :(NSString*)query completionHandler:(void (^)(NSMutableArray *array))completionHandler { 
    NSDate *date = [[NSDate alloc] init]; 
    NSDateFormatter *dateFormatter = [[NSDateFormatter alloc] init]; 
    [dateFormatter setDateFormat:@"yyyymmdd"]; 
    NSString *today = [dateFormatter stringFromDate:date]; 
    NSMutableArray *response = [[NSMutableArray alloc] init]; 
    NSString *url = [NSString stringWithFormat:@"%@/venues/search?v=%@&ll=%@&query=%@&client_id=%@&client_secret=%@&intent=checkin", kBaseUrl,today,ll,query,kClientId,kClientSecret]; 
    NSLog(@"%@", url); 
    AFHTTPSessionManager *manager = [AFHTTPSessionManager manager]; 
    [manager GET:url parameters:nil progress:nil success:^(NSURLSessionDataTask * _Nonnull task, id _Nullable responseObject) { 
     NSDictionary *objects = (NSDictionary *)responseObject; 
     NSDictionary *venues = objects[@"response"][@"venues"]; 
     for (NSDictionary *object in venues) { 
      Venue *venue = [[Venue alloc] init]; 
      venue.name = object[@"name"]; 
      venue.venueId = object[@"id"]; 
      venue.stats.usersCount = object[@"stats"][@"usersCount"]; 
      venue.stats.checkinsCount = object[@"stats"][@"checkinsCount"]; 
      venue.stats.tipCount = object[@"stats"][@"tipCount"]; 
      venue.location.address = object[@"location"][@"address"]; 
      venue.location.city = object[@"location"][@"city"]; 
      venue.location.lat = object[@"location"][@"lat"]; 
      venue.location.lng = object[@"location"][@"lng"]; 
      venue.location.crossStreet = object[@"location"][@"crossStreet"]; 
      venue.location.distance = object[@"location"][@"distance"]; 
      venue.location.cc = object[@"location"][@"cc"]; 
      venue.location.country = object[@"location"][@"country"]; 
      NSLog(@"%@",venue.location); 
      [response addObject:venue]; 
     } 
     completionHandler(response); 
    } failure:^(NSURLSessionDataTask * _Nullable task, NSError * _Nonnull error) { 
     NSLog(@"Error: %@", error); 
    }]; 

} 

이 조건을 변경하려면 어떻게해야합니까?

Answer 1

값을 할당하기 전에 통계 및 위치 클래스를 인스턴스화해야합니다. 더러운 예 : 나는 개체의 속성을 보지 못했다

Venue *venue = [[Venue alloc] init]; 
venue.stats = [[Stats alloc] init]; 
venue.location = [[Location alloc] init]; 

Answer 2

가 생성되는 모든 객체가 초기화되어 있는지 확인하십시오.