开源第三方地址： https://github.com/icanzilb/JSONModel

• 1 model 创建

#import "JSONModel.h"

// 次model
@interface ScoreModel : JSONModel
@property (nonatomic, strong) NSString *english;
@property (nonatomic, strong) NSString *chinese;
@end

// 主model
@interface UserModel : JSONModel
@property (nonatomic, strong) NSString *name;       // 一般
@property (nonatomic, strong) ScoreModel *scores;  // model 嵌套 model
@property (nonatomic, strong) NSString *eng_score; // 获取 scores 中的 英语成绩，model多级映射
@property (nonatomic, strong) NSArray *scoreArray;// model 嵌套数组
@end

• 2 model 属性 可空 或 不存在

#import "UserModel.h"
@implementation ScoreModel
+ (BOOL)propertyIsOptional:(NSString *)propertyName{
    return YES; //
}
@end
@implementation UserModel
+ (BOOL)propertyIsOptional:(NSString *)propertyName{
    return YES;
}

• 3 修改 映射 路径,

+(JSONKeyMapper*)keyMapper{
    // 映射路径 : 属性名
    return [[JSONKeyMapper alloc] initWithDictionary:@{
                                                       @"scores.english": @"eng_score"
                                                       }];
}

• 4 举例

    NSDictionary *dict = @{
                           @"name" : @"Jack",
                           @"address":@"浙大紫金港",
                           @"age" : @"20",
                           @"scores":@{@"english":@"99",@"chinese":@"133"},
                           @"scoreArray":@[@{@"english":@"99",@"chinese":@"133"},
                                           @{@"english":@"98",@"chinese":@"134"},
                                           @{@"english":@"97",@"chinese":@"135"}]
                           };

 
    UserModel *model = [[UserModel alloc] initWithDictionary:dict error:nil];
    NSLog(@"%@",model.name);// 正常的 字典
    NSLog(@"%@",model.scores.english);// 嵌套 model
    NSLog(@"%@",model.eng_score);// 修改映射路径
    NSLog(@"%@",model.scoreArray[0]);// 嵌套 model数组

其他

model 属性 不仅限于 NSString类型。
model 可以 设置 ignores