獲取當前頁面的topViewController

Controller中獲取

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

+ (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;
    }
}
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view 中獲取

- (UIViewController *)viewController {
    for(UIView* next = [self superview]; next; next = next.superview) {
        UIResponder* nextResponder = [next nextResponder];
        if([nextResponder isKindOfClass:[UIViewController class]]) {
            return (UIViewController*)nextResponder;
        }
    }
    return nil;
}

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