前言：

 续上一篇https://blog.csdn.net/qq_33226881/article/details/86635136写如何封装UITableView的数据源和代理源以达到对C瘦身以及解耦目的后，又一篇对C瘦身以及解耦的文章，大家可整合两篇进行使用，基本可以使C变得好看很多，不显得辣么臃肿。

MVP设计模式：

1、数据请求放于M里面

2、新增一个modelPresent类，用于处理逻辑，并且编写一个协议，让C进行遵守此协议，以达到C和present交互的效果

3、好处是C里面没了数据请求，只要遵守协议就能拿到数据，并且V和M之间进行了完全的解耦

代码展示：

Model.h文件

#import <Foundation/Foundation.h>

NS_ASSUME_NONNULL_BEGIN

@interface UserModel : NSObject

@property (nonatomic, assign)NSInteger age;

@property (nonatomic, copy)NSString *name;

@property (nonatomic, copy)NSString *email;

- (instancetype)initWithAge:(NSInteger)age name:(NSString *)name email:(NSString *)email;

///模拟获取数据
+ (void)getUser:(void(^)(NSArray <UserModel *> *users))usersBlock;

@end

NS_ASSUME_NONNULL_END

Model.m文件

#import "UserModel.h"

@implementation UserModel

- (instancetype)initWithAge:(NSInteger)age name:(NSString *)name email:(NSString *)email
{
    self = [super init];
    if (self) {
        _age = age;
        _name = name;
        _email = email;
    }
    return self;
}

+ (void)getUser:(void(^)(NSArray <UserModel *> *users))usersBlock
{
    //11行
    NSInteger count = 10;
    NSMutableArray<UserModel *> *users = [NSMutableArray arrayWithCapacity:count];
    for (int i = 0 ; i < count; i++) {
        NSString *indexStr = [NSString stringWithFormat:@"%ld",(long)i];
        UserModel *user = [[UserModel alloc]initWithAge:i name:indexStr email:indexStr];
        [users addObject:user];
    }
    
    dispatch_after(dispatch_time(DISPATCH_TIME_NOW, (int64_t)(2 * NSEC_PER_SEC)), dispatch_get_main_queue(), ^{
        if (usersBlock) {
            usersBlock(users);
        }
    });
}

@end

modelPresent.h文件

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

NS_ASSUME_NONNULL_BEGIN

///建议协议另建一个protocol文件方便管理
@protocol UserViewDelegate <NSObject>

@optional

- (void)startLoading;
- (void)finishLoading;
///数据为空时
- (void)setEmptyUsers;

@required
- (void)setUsers:(NSArray<UserModel *> *)users;

@end

@interface UserModelPresent : NSObject

@property (nonatomic, weak)id <UserViewDelegate> delegate;
///逻辑启动入口
- (void)getUsers;

@end

NS_ASSUME_NONNULL_END

modelPresent.m文件

#import "UserModelPresent.h"

@implementation UserModelPresent

- (void)getUsers
{
    __weak typeof(self) weakSelf = self;
    [UserModel getUser:^(NSArray<UserModel *> * _Nonnull users) {
        
        [weakSelf.delegate finishLoading];
        
        BOOL isUsers = users && users.count;
        if (!isUsers) {
            [weakSelf.delegate setEmptyUsers];
        }else{
            if ([weakSelf.delegate respondsToSelector:@selector(setUser:)]) {
                [weakSelf.delegate setUsers:users];
            }
        }
        
    }];
}

@end

controller调用

#import "ViewController.h"
#import "UserModelPresent.h"

@interface ViewController ()<UserViewDelegate>

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
    // Do any additional setup after loading the view.
}

#pragma mark - <UserViewDelegate>
- (void)startLoading
{
    NSLog(@"开始操作");
}

- (void)finishLoading
{
    NSLog(@"结束操作");
}

- (void)setEmptyUsers
{
    NSLog(@"数据为空");
}

- (void)setUsers:(NSArray<UserModel *> *)users
{
    NSLog(@"接收数据");
}

@end

欢迎各位看官提出不足之处以及更好的解决方案