JSJP_Student/jiaPei/Modules/BaseModule/BaseClass/ViewModel/RQBaseViewModel.m

//
//  RQBaseViewModel.m
//  RQCommon
//
//  Created by 张嵘 on 2018/11/13.
//  Copyright © 2018 张嵘. All rights reserved.
//	所有自定义的视图模型的基类

#import "RQBaseViewModel.h"

/// MVVM View
/// The base map of 'params'
/// The `params` parameter in `-initWithParams:` method.
/// Key-Values's key
/// 传递唯一ID的key：例如：商品id 用户id...
NSString *const RQViewModelIDKey = @"RQViewModelIDKey";
/// 传递导航栏title的key：例如 导航栏的title...
NSString *const RQViewModelTitleKey = @"RQViewModelTitleKey";
/// 传递数据模型的key：例如 商品模型的传递 用户模型的传递...
NSString *const RQViewModelUtilKey = @"RQViewModelUtilKey";
/// 传递webView Request的key：例如 webView request...
NSString *const RQViewModelRequestKey = @"RQViewModelRequestKey";
/// 传递数据的key
NSString *const RQViewCommonValueKey = @"RQViewCommonValueKey";

@interface RQBaseViewModel ()
/// 整个应用的服务层 The `services` parameter in `-initWithServices:params` method.
@property (nonatomic, strong, readwrite) id<RQViewModelServices> services;
/// The `params` parameter in `-initWithServices:params` method.
@property (nonatomic, readwrite, copy) NSDictionary *params;
/// A RACSubject object, which representing all errors occurred in view model.
@property (nonatomic, readwrite, strong) RACSubject *errors;
/// The `View` willDisappearSignal
@property (nonatomic, readwrite, strong) RACSubject *willDisappearSignal;
@end

@implementation RQBaseViewModel
/// when `BaseViewModel` created and call `initWithParams` method , so we can ` initialize `
+ (instancetype)allocWithZone:(struct _NSZone *)zone {
	RQBaseViewModel *viewModel = [super allocWithZone:zone];
	@weakify(viewModel)
	[[viewModel
	  rac_signalForSelector:@selector(initWithServices:params:)]
	 subscribeNext:^(id x) {
		 @strongify(viewModel)
		 [viewModel initialize];
	 }];
	return viewModel;
}

/// create `viewModel` instance
- (instancetype)initWithServices:(id<RQViewModelServices>)services params:(NSDictionary *)params {
	self = [super init];
	if (self) {
		/// 默认在viewDidLoad里面加载本地和服务器的数据
		self.shouldFetchLocalDataOnViewModelInitialize = YES;
		self.shouldRequestRemoteDataOnViewDidLoad = YES;
		/// 允许IQKeyboardMananger接管键盘弹出事件
		self.keyboardEnable = YES;
		self.shouldResignOnTouchOutside = YES;
		self.keyboardDistanceFromTextField = 10.0f;
		
		self.title = params[RQViewModelTitleKey];
		/// 赋值
		self.services = services;
		self.params   = params;
	}
	return self;
}


- (RACSubject *)errors {
	if (!_errors) _errors = [RACSubject subject];
	return _errors;
}

- (RACSubject *)willDisappearSignal {
	if (!_willDisappearSignal) _willDisappearSignal = [RACSubject subject];
	return _willDisappearSignal;
}

/// sub class can override
- (void)initialize {
	
}
@end