//
//  UIViewController+Utils.m
//  LightWallPaper
//
//  Created by yuebin on 17/2/11.
//  Copyright © 2017年 adesk. All rights reserved.
//

#import "UIViewController+CurViewController.h"

@implementation UIViewController (CurViewController)

+ (UIViewController*) currentViewController {
    
    // Find best view controller
    UIViewController* viewController = [UIApplication sharedApplication].keyWindow.rootViewController;
    return [UIViewController findBestViewController:viewController];
}

#pragma mark - 内部方法
+ (UIViewController *) findBestViewController:(UIViewController*)vc {
    
    if (vc.presentedViewController) {
        
        // Return presented view controller
        return [UIViewController findBestViewController:vc.presentedViewController];
        
    } else if ([vc isKindOfClass:[UISplitViewController class]]) {
        
        // Return right hand side
        UISplitViewController* svc = (UISplitViewController*) vc;
        if (svc.viewControllers.count > 0)
            return [UIViewController findBestViewController:svc.viewControllers.lastObject];
        else
            return vc;
        
    } else if ([vc isKindOfClass:[UINavigationController class]]) {
        
        // Return top view
        UINavigationController* svc = (UINavigationController*) vc;
        if (svc.viewControllers.count > 0)
            return [UIViewController findBestViewController:svc.topViewController];
        else
            return vc;
        
    } else if ([vc isKindOfClass:[UITabBarController class]]) {
        
        // Return visible view
        UITabBarController* svc = (UITabBarController*) vc;
        if (svc.viewControllers.count > 0)
            return [UIViewController findBestViewController:svc.selectedViewController];
        else
            return vc;
        
    } else {
        
        // Unknown view controller type, return last child view controller
        return vc;
        
    }
}


@end