model模型创建（模型里面套模型）

作者: huicuihui | 来源:发表于2018-02-07 16:12 被阅读77次

在做公司项目的时候，数据是解析的json文件， json文件包括所有的数据（不同的列表数据和点进去的详情数据）。里面的内容样式是这样的：
这是最外层的数据格式：

image.png

所以可以先创建一个model继承自NSObject
里面有如下几个属性：

#import <Foundation/Foundation.h>
#import "ChildrenModel.h"
@interface JournalModel : NSObject
@property (nonatomic, copy)NSString *zhunze;
@property (nonatomic, copy)NSString *zhunzecode;
@property (nonatomic, strong)NSArray <ChildrenModel *>*children;

@end

.m的实现文件如下：

#import "JournalModel.h"

@implementation JournalModel
- (void)setValue:(id)value forKey:(NSString *)key {
    //必须得加上这句话   不然除了下面重写的children有值，其它的字段会没数据
    [super setValue:value forKey:key];

    if ([key isEqualToString:@"children"]) {
        NSMutableArray *tempArray = [NSMutableArray array];
        for (NSDictionary *obj in value) {
            ChildrenModel *model = [[ChildrenModel alloc]init];
            [model setValuesForKeysWithDictionary:obj];
            [tempArray addObject:model];
        }
        self.children = tempArray;
    }
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {

}
@end

注：

只要是重写了- (void)setValue:(id)value forKey:(NSString *)key方法，必须得先调用父类的方法[super setValue:value forKey:key];，否则就会只显示重新赋值的key的值，其他的key会没有值。
第二层的数据参数如下图：

image.png
创建一个model继承自NSObject
里面有如下几个属性：

#import <Foundation/Foundation.h>
#import "ChildModel.h"
@interface ChildrenModel : NSObject
@property (nonatomic, copy)NSString *leibie;
@property (nonatomic, copy)NSString *leibiecode;
@property (nonatomic, copy)NSString *href;
@property (nonatomic, strong)NSArray <ChildModel *>*child;

@end

.m实现文件如下：

#import "ChildrenModel.h"

@implementation ChildrenModel
- (void)setValue:(id)value forKey:(NSString *)key {
    //这句话要实现， 不然视图上不显示数据。
    [super setValue:value forKey:key];

    if ([key isEqualToString:@"child"]) {
        NSMutableArray *tempArray = [NSMutableArray array];
        for (NSDictionary *obj in value) {
            ChildModel *model = [[ChildModel alloc]init];
            [model setValuesForKeysWithDictionary:obj];
            [tempArray addObject:model];
        }
        self.child = tempArray;
    }
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}
@end

最后一层的数据如下图：

image.png

创建一个model继承自NSObject
里面有如下几个属性：

#import <Foundation/Foundation.h>
#import "DetailModel.h"
@interface ChildModel : NSObject
@property (nonatomic, copy)NSString *zilei;
@property (nonatomic, copy)NSString *zileicode;
@property (nonatomic, strong)NSArray <DetailModel *>*detail;

@end

.m的实现文件：

#import "ChildModel.h"

@implementation ChildModel
- (void)setValue:(id)value forKey:(NSString *)key {
    //这句话要实现， 不然视图上不显示数据。
    [super setValue:value forKey:key];

    if ([key isEqualToString:@"detail"]) {
        NSMutableArray *tempArray = [NSMutableArray array];
        if ([value isKindOfClass:[NSArray class]]) {
            if (!([value count] > 0)) {
                //这行也得加上，不然后面用到model.detail的时候会出错。
                self.detail = [NSArray array];

                return;
            }
        } else {
                //这行也得加上，不然后面用到model.detail的时候会出错。
                self.detail = [NSArray array];

            return;
        }
        for (NSDictionary *obj in value) {
            DetailModel *model = [[DetailModel alloc]init];
            [model setValuesForKeysWithDictionary:obj];
            [tempArray addObject:model];
        }
        self.detail = tempArray;
    }
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}
@end

最终的详情model

image.png

#import <Foundation/Foundation.h>

@interface DetailModel : NSObject
@property (nonatomic, copy)NSString *shumu;
@property (nonatomic, strong)NSArray *jie;
@property (nonatomic, strong)NSArray *dai;

@end

#import "DetailModel.h"

@implementation DetailModel
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}
@end

已经写完了，但是运行之后，解析数据，会崩溃到ChildModel文件下面的方法中：

image.png

控制台中报如下错误：
-[__NSCFString countByEnumeratingWithState:objects:count:]: unrecognized selector sent to instance 0x60400085dcd0
查找问题知道原因是因为：
如果你要是对一个数组进行forin操作，并且你的数组是null 可能就会报这个错
被枚举对象是一个NSNull值。
本质就是:

for(id a in [NSNull null]){

}

解决方法：
添加下面方法判断：

        if ([value isKindOfClass:[NSArray class]]) {
            if ([value count] > 0) {
                //这行也得加上，不然后面用到model.detail的时候会出错。
                self.detail = [NSArray array];

                //如果数组内容为空， 不做下面操作。
                return;
            }
        } else {
                //这行也得加上，不然后面用到model.detail的时候会出错。
                self.detail = [NSArray array];

            //如果不是数组类型的直接跳出， 不做下面操作。
            return;
        }

ChildModel的实现为：

#import "ChildModel.h"

@implementation ChildModel

- (void)setValue:(id)value forKey:(NSString *)key {
    //必须得调用父类的方法，不然详情的没有数据。
    [super setValue:value forKey:key];
    if ([key isEqualToString:@"detail"]) {
        NSMutableArray *tempArray = [NSMutableArray array];
        if ([value isKindOfClass:[NSArray class]]) {
            if (!([value count] > 0)) {
                //这行也得加上，不然后面用到model.detail的时候会出错。
                self.detail = [NSArray array];

                //如果数组内容为空， 不做下面操作。
                return;
            }
        } else {
                //这行也得加上，不然后面用到model.detail的时候会出错。
                self.detail = [NSArray array];

            //如果不是数组类型的直接跳出， 不做下面操作。
            return;
        }
        for (NSDictionary *obj in value) {
            DetailModel *model = [[DetailModel alloc]init];
            [model setValuesForKeysWithDictionary:obj];
            [tempArray addObject:model];
        }
        self.detail = tempArray;
    }
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {

}
@end

在一个文件中创建model

后台返回的数据格式如下，

{
    code = 1000;
    data =     (
                {
            awardDetails =             (
                                {
                    category = 10001;
                    coverPic = "https://pic.ningmengyun.com/PicLibrary/AppProducts/NaNaNaN/NaNaNaNaNaNaN/20180329172758cut.jpg?t=0.8026015642824169";
                    effectiveText = "\U957f\U671f\U6709\U6548";
                    expressNeeded = 1;
                    expriseDate = 0;
                    inventory = 1193;
                    isExpire = 0;
                    isLimitInventory = 0;
                    orderLevel = 0;
                    price = 390;
                    prodId = 900807;
                    prodName = "\U300a\U4f01\U4e1a\U4f1a\U8ba1\U5904\U7406\U4e0e\U7eb3\U7a0e\U7533\U62a5\U771f\U8d26\U5b9e\U64cd\U300b\U300a\U4f01\U4e1a\U4f1a\U8ba1\U5904\U7406\U4e0e\U7eb3\U7a0e\U7533\U62a5\U771f\U8d26\U5b9e\U64cd\U300b\U300a\U4f01\U4e1a\U4f1a\U8ba1\U5904\U7406\U4e0e\U7eb3\U7a0e\U7533\U62a5\U771f\U8d26\U5b9e\U64cd\U300b";
                },
                                {
                    category = 10001;
                    coverPic = "https://pic.ningmengyun.com/PicLibrary/AppProducts/NaNaNaN/NaNaNaNaNaNaN/20180324170206cut.jpg";
                    effectiveText = "\U957f\U671f\U6709\U6548";
                    expressNeeded = 1;
                    expriseDate = 0;
                    inventory = 0;
                    isExpire = 0;
                    isLimitInventory = 0;
                    orderLevel = 0;
                    price = 450;
                    prodId = 900808;
                    prodName = "\U300a\U4e2d\U5c0f\U4f01\U4e1a\U7a0e\U52a1\U4e0e\U4f1a\U8ba1\U5b9e\U52a1\U300b";
                },
                                {
                    category = 10001;
                    coverPic = "https://pic.ningmengyun.com/PicLibrary/AppProducts/NaNaNaN/NaNaNaNaNaNaN/20180324170310cut.jpg";
                    effectiveText = "\U957f\U671f\U6709\U6548";
                    expressNeeded = 1;
                    expriseDate = 253402185600000;
                    inventory = 4;
                    isExpire = 0;
                    isLimitInventory = 0;
                    orderLevel = 0;
                    price = 5566;
                    prodId = 900809;
                    prodName = "\U300a\U65bd\U5de5\U4f01\U4e1a\U4f1a\U8ba1\U6838\U7b97\U4e0e\U5904\U7406\U5b9e\U6218\U300b";
                },
                                {
                    category = 10001;
                    coverPic = "https://pic.ningmengyun.com/PicLibrary/AppProducts/NaNaNaN/NaNaNaNaNaNaN/20180324170350cut.jpg";
                    effectiveText = "\U957f\U671f\U6709\U6548";
                    expressNeeded = 1;
                    expriseDate = 0;
                    inventory = 995;
                    isExpire = 0;
                    isLimitInventory = 0;
                    orderLevel = 0;
                    price = 20;
                    prodId = 900810;
                    prodName = "\U300a\U8d22\U52a1\U62a5\U544a\U5206\U6790\U300b";
                },
                                {
                    category = 10001;
                    coverPic = "https://pic.ningmengyun.com/PicLibrary/AppProducts/NaNaNaN/NaNaNaNaNaNaN/20180324170445cut.jpg?t=0.29931295238424793";
                    effectiveText = "\U957f\U671f\U6709\U6548";
                    expressNeeded = 1;
                    expriseDate = 0;
                    inventory = 1;
                    isExpire = 0;
                    isLimitInventory = 0;
                    orderLevel = 0;
                    price = 550;
                    prodId = 900811;
                    prodName = "\U300a\U8d22\U52a1Excel\U8fbe\U4eba\U901f\U6210\U300b";
                },
                                {
                    category = 10001;
                    coverPic = "https://pic.ningmengyun.com/PicLibrary/AppProducts/NaNaNaN/NaNaNaNaNaNaN/20180324170930cut.jpg?t=0.48121949416046905";
                    effectiveText = "\U5df2\U8fc7\U671f";
                    expressNeeded = 1;
                    expriseDate = 1540009425000;
                    inventory = 0;
                    isExpire = 1;
                    isLimitInventory = 0;
                    orderLevel = 0;
                    price = 680;
                    prodId = 900812;
                    prodName = "\U300a\U589e\U503c\U7a0e\U7eb3\U7a0e\U5b9e\U52a1\U4e0e\U8282\U7a0e\U6280\U5de7\U300b";
                }
            );
            category =             {
                categoryId = 10001;
                name = "\U4f1a\U8ba1\U5b9e\U64cd";
                num = 6;
                order = 1;
            };
        }
    );
    msg = "<null>";
    subCode = 0;
}

data是一个数组，数组里面对象是字典，字典中有两个键值对awardDetails和category，awardDetails是一个数组，category是一个字典。
整个模型里面包括两个模型awardDetails和category，可以在模型文件中再创建两个子模型AwardDetailModel和CategoryModel。
实现如下：
CashPrizeModel.h

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface AwardDetailModel : NSObject
@property (nonatomic, copy)NSString *category;
@property (nonatomic, copy)NSString *coverPic;
@property (nonatomic, copy)NSString *effectiveText;
@property (nonatomic, copy)NSString *expressNeeded;
@property (nonatomic, copy)NSString *expriseDate;
@property (nonatomic, copy)NSString *inventory;
@property (nonatomic, copy)NSString *isExpire;
@property (nonatomic, copy)NSString *isLimitInventory;
@property (nonatomic, copy)NSString *orderLevel;
@property (nonatomic, copy)NSString *price;
@property (nonatomic, copy)NSString *prodId;
@property (nonatomic, copy)NSString *prodName;
@end

@interface CategoryModel : NSObject
@property (nonatomic, copy)NSString *categoryId;
@property (nonatomic, copy)NSString *name;
@property (nonatomic, copy)NSString *num;
@property (nonatomic, copy)NSString *order;
@end

@interface CashPrizeModel : NSObject
@property (nonatomic, strong)NSArray <AwardDetailModel *>*awardDetailModels;
@property (nonatomic, strong)CategoryModel *categoryModel;
@end

NS_ASSUME_NONNULL_END

CashPrizeModel.m文件

#import "CashPrizeModel.h"

@implementation AwardDetailModel
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}
@end

@implementation CategoryModel
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}
@end

@implementation CashPrizeModel
- (void)setValue:(id)value forKey:(NSString *)key {
    [super setValue:value forKey:key];
    if ([key isEqualToString:@"awardDetails"]) {
        NSMutableArray *tempArray = [NSMutableArray arrayWithCapacity:0];
        for (NSDictionary *dic in value) {
            AwardDetailModel *model = [[AwardDetailModel alloc]init];
            [model setValuesForKeysWithDictionary:dic];
            [tempArray addObject:model];
        }
        self.awardDetailModels = tempArray;
    } else if ([key isEqualToString:@"category"]) {
        self.categoryModel = [[CategoryModel alloc]init];
        [self.categoryModel setValuesForKeysWithDictionary:value];
    }
}
- (void)setValue:(id)value forUndefinedKey:(NSString *)key {
    
}
@end

model模型创建（模型里面套模型）

注：

在一个文件中创建model

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