runtime 字典转模型 二级 三级

runtime 获取属性 和 成员变量不清楚的先看

1. 给 NSObject 添加分类

NSObject+DicToModel.h

#import <Foundation/Foundation.h>

@interface NSObject (DicToModel)

+ (instancetype)modelWithDic:(NSDictionary *)dic;

@end

NSObject+DicToModel.m

#import <objc/runtime.h>
#import "NSObject+DicToModel.h"

@implementation NSObject (DicToModel)

// 字典转模型
+ (instancetype)modelWithDic:(NSDictionary *)dic {
    id obj = [[self alloc] init];
    Class tClass = [self class];
    unsigned int count = 0;
    Ivar *ivalList = class_copyIvarList(tClass, &count);
    for (int i = 0; i < count; i++) {
        Ivar ivar = ivalList[i];
        // 成员变量名称
        const char *charName = ivar_getName(ivar);
        NSString *name = [NSString stringWithUTF8String:charName];
        // 成员变量类型
        const char *charType = ivar_getTypeEncoding(ivar);
        NSString *type = [NSString stringWithUTF8String:charType];
        
        // 将 name 和 type 整理
        name = [name substringFromIndex:1];
        type = [type substringFromIndex:2];
        type = [type substringToIndex:[type length] - 1];
        
        // 根据name (也就是与字典的key对应)取出 value
        NSString *key = [name copy];
        id value = dic[name];
        
        // 二级转换
        if ([value isKindOfClass:[NSDictionary class]]) {
            Class nClass = NSClassFromString(type);
            value = [nClass modelWithDic:value];
        }
        
        // 三级转换
        if ([value isKindOfClass:[NSArray class]]) {
            NSMutableArray *mutArray = [NSMutableArray array];
            NSArray *array = (NSArray *)value;
            for (NSInteger i = 0; i < [array count]; i++) {
                NSDictionary *mapping = [self performSelector:@selector(getMapping)];
                Class interClass = mapping[key];
                id interObj = [interClass modelWithDic:array[i]];
                [mutArray addObject:interObj];
            }
            value = [mutArray copy];
        }
        
        [obj setValue:value forKey:key];
    }
    free(ivalList);
    return obj;
}

2. 新建立 Model 文件

TYLModel.h

#import <Foundation/Foundation.h>
#import "User.h"

@interface TYLModel : NSObject

@property (nonatomic, copy) NSString *content;
@property (nonatomic, strong) User *user;
@property (nonatomic, strong) NSArray<User *> *userArray;

@end

TYLModel.m

#import "TYLModel.h"
#import "User.h"

@implementation TYLModel

+ (NSDictionary *)getMapping {
    return [NSDictionary dictionaryWithObjectsAndKeys:[User class], @"userArray", nil];
}

@end

User.h

#import <Foundation/Foundation.h>

@interface User : NSObject

@property (nonatomic, copy) NSString *account;

@end

User.m

#import "User.h"

@implementation User
@end

开始测试

记得导入头文件#import "NSObject+DicToModel.h"

    NSDictionary *dic = @{@"content" : @"hello tyler",
                          @"user" : @{@"account" :@12342},
                          @"userArray": @[@{@"account" : @8888}]};
    TYLModel *model = [TYLModel modelWithDic:dic];
    User *user = model.userArray[0];
    NSLog(@"%@",user.account);