NSObject返回Null

Question

我有3节课。我试图像这样使用其中一个，但我知道有些事情是错的，但无法弄清楚我做错了什么。这是我的代码。 地点等级

results = [(4,[1],[4]),(5,[1],[5]),(6,[1],[6]),(7,[1],[7]),
           (8,[2],[4]),(10,[2],[5]),(12,[2],[6]),(14,[2],[7]),
           (12,[3],[4]),(15,[3],[5]),(18,[3],[6]),(21,[3],[7])]
reduce( ( lambda x,y: x if x[0]<y[0] else y), results )

位置等级

@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

和统计类

#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

当我尝试分配位置和统计值时，它返回null。

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

我应该怎样做才能改变这种情况？

Answer 1

在为其分配值之前，您需要实例化Stats和Location类。 肮脏的例子：

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

Answer 2

我还没有看到正在创建的对象属性，请确保所有对象都已初始化。