有时候从后台返回数据json转model之后，还是nsnumber
比如
#import
@interfaceSelectMessageModel :NSObject
/**
*贷款合同号
*/
@property(nonatomic,copy)NSString*contractNo;
/**
*贷款申请序列号
*/
@property(nonatomic,copy)NSString*loanApplySerialNo;
/**
*分期金额
*/
@property(nonatomic,copy)NSString*loanAmount;
/**
*期数
*/
@property(nonatomic,copy)NSString*loanTerm;
/**
*申请时间
*/
@property(nonatomic,copy)NSString*applyTime;
/**
*状态
*/
@property(nonatomic,copy)NSString*applyState;
/*
产品类型
*/
@property(nonatomic,copy)NSString*productType;
- (void)setValue:(id)value forUndefinedKey:(NSString*)key;
但是返回来的loanTerm [model.loanTerm.descriptionstringByAppendingString:@"期"];
这样做就会报错，报nsnumber没有这个方法
这时候
[model.loanTerm.descriptionstringByAppendingString:@"期"];
就好了
