重点：

1.viewmodel 包含model

2.view包含viewmodel,通过驱动viewmodel去控制model的数据和业务逻辑

// Test.cpp : 此文件包含 "main" 函数。程序执行将在此处开始并结束。
//

#include <iostream>
#include <vector>


using namespace std;

#pragma once
//Model数据处理器
class Model
{
public:
	void Increace()
	{
		count++;
	}
	void Decreace()
	{
		count--;
	}
	int GetCount()
	{
		return count;
	}
	void SetCount(int num)
	{
		count = num;
	}
private:
	int count{ 10 };
};

//ViewModel
class ViewModel
{
public:
	ViewModel(shared_ptr<Model> model) :m_model(model)
	{
	}

	int HandleIncrementPressed()
	{
		m_model->Increace();
		return m_model->GetCount();
	}
	int HandleDecrementPressed()
	{
		m_model->Decreace();
		return m_model->GetCount();
	}
	int GetInfo()
	{
		return m_model->GetCount();
	}
private:
	shared_ptr<Model> m_model;
};

class View
{
public:
	View(shared_ptr<ViewModel> vm) :m_viewModel(vm)
	{
	}

	void HandleIncrementPressed()
	{
		m_viewModel->HandleIncrementPressed();
		cout << m_viewModel->GetInfo()<<endl;
	}

	void HandleDecrementPressed()
	{
		m_viewModel->HandleDecrementPressed();
		cout << m_viewModel->GetInfo() << endl;
	}
private:
	shared_ptr<ViewModel> m_viewModel;
};
int main()
{
	shared_ptr<Model> model= make_shared<Model>();
	
	shared_ptr<ViewModel> cont = make_shared<ViewModel>(model);
	shared_ptr<View> view = make_shared<View>(cont);
	view->HandleIncrementPressed();

	view->HandleDecrementPressed();
	return 0;

}