[__NSCFNumber length]: unrecognized selector sent to instance 0x8b3c310

Terminating app due to uncaught exception 'NSInvalidArgumentException', reason:
'-[__NSCFNumber length]: unrecognized selector sent to instance 0x8b3c310’

@property (nonatomic, copy) NSString *username;
@property (nonatomic, copy) NSString *userhead;
@property (nonatomic, copy) NSNumber *replyNum;
@property (nonatomic, copy) NSNumber *likedNum;
@property (nonatomic, copy) NSNumber *isLiked;

报错原因

replyNum数据类型为NSNumber类型,之前写成了NSString类型,所以报了以上错误

解决方法:

将模型属性中的replyNum改为NSNumber类型,

调用时做下数据类型转换,转成NSString即可