YYXC_Student/jiaPei/Utils/Helper/RQControllerHelper.m

//
//  RQControllerHelper.m
//  RQCommon
//
//  Created by 张嵘 on 2018/11/23.
//  Copyright © 2018 张嵘. All rights reserved.
//	管理视图控制器的工具类

#import "RQControllerHelper.h"
#import "RQMainTabBarViewController.h"

@implementation RQControllerHelper
+ (UIViewController *)currentViewController {
	UIViewController *resultVC;
	resultVC = [self _topViewController:[[UIApplication sharedApplication].keyWindow rootViewController]];
	
	/// RQ Fixed : 这里必须要判断一下，否则取出来永远都是 RQMainTabBarViewController。这是架构上小缺(特)陷(性)。因为RQMainTabBarViewController的子控制器是UITabBarController，所以需要递归UITabBarController的所有的子控制器
	if ([resultVC isKindOfClass:[RQMainTabBarViewController class]]) {
		RQMainTabBarViewController *mainVc = (RQMainTabBarViewController *)resultVC;
		resultVC = [self _topViewController:mainVc.tabBarController];
	}
	
	while (resultVC.presentedViewController) {
		resultVC = [self _topViewController:resultVC.presentedViewController];
	}
	return resultVC;
}

+ (UIViewController *)_topViewController:(UIViewController *)vc {
	if ([vc isKindOfClass:[UINavigationController class]]) {
		return [self _topViewController:[(UINavigationController *)vc topViewController]];
	} else if ([vc isKindOfClass:[UITabBarController class]]) {
		return [self _topViewController:[(UITabBarController *)vc selectedViewController]];
	} else {
		return vc;
	}
}


+ (UINavigationController *)topNavigationController{
	return RQSharedAppDelegate.navigationControllerStack.topNavigationController;
}

+ (RQBaseViewController *)topViewController
{
	RQBaseViewController *topViewController = (RQBaseViewController *)[self topNavigationController].topViewController;
	
	/// 确保解析出来的类 也是 RQBaseViewController
	NSAssert([topViewController isKindOfClass:RQBaseViewController.class], @"topViewController is not an RQBaseViewController's subclass: %@", topViewController);
	
	return topViewController;
}
@end