71_iOS干货37_获取最外层window+获取当前window的VC+根据显示的view找到对应的VC+判断和获取导航控制器中的VC

一，获取最外层的window

+(UIWindow *)getOutWindow() {
    id appDelegate = [UIApplication sharedApplication].delegate;
    if (appDelegate && [appDelegate respondsToSelector:@selector(window)]) {
        return [appDelegate window];
    }
    
    NSArray *windows = [UIApplication sharedApplication].windows;
    if ([windows count] == 1) {
        return [windows firstObject];
    }
    else {
        for (UIWindow *window in windows) {
            if (window.windowLevel == UIWindowLevelNormal) {
                return window;
            }
        }
    }
    return nil;
}

二，获取当前window的控制器VC

+ (UIViewController *)getCurrentActivityViewController {
    UIWindow *window = [UIApplication sharedApplication].delegate.window;
    NSLog(@"window level: %.0f", window.windowLevel);
    if (window.windowLevel != UIWindowLevelNormal) {
        NSArray *windows = [[UIApplication sharedApplication] windows];
        for (UIWindow * tmpWin in windows) {
            if (tmpWin.windowLevel == UIWindowLevelNormal) {
                window = tmpWin;
                break;
            }
        }
    }
    
    //从根控制器开始查找
    UIViewController *rootVC = window.rootViewController;
    UIViewController *activityVC = nil;
    
    while (true) {
        if ([rootVC isKindOfClass:[UINavigationController class]]) {
            activityVC = [(UINavigationController *)rootVC visibleViewController];
            
        } else if ([rootVC isKindOfClass:[UITabBarController class]]) {
            activityVC = [(UITabBarController *)rootVC selectedViewController];
            
        } else if (rootVC.presentedViewController) {
            activityVC = rootVC.presentedViewController;
        }  else {
            break;
        }
        
        rootVC = activityVC;
    }
    
    return activityVC;
}

三，根据显示的view找到对应的控制器VC

+ (UIViewController *)getViewControllerWithView:(UIView *)view {
    for (UIView* next = [view superview]; next; next = next.superview) {
        UIResponder *nextResponder = [next nextResponder];
        if ([nextResponder isKindOfClass:[UIViewController class]]) {
            return (UIViewController *)nextResponder;
        }
    }
    return nil;
}

四，判断导航控制器中是否含有某类控制器VC

+ (BOOL)haveSpecialVCWithStack:(UINavigationController *)navi SpecificName:(NSString *)name;
{
    for (UIViewController *controller in navi.viewControllers) {
        if ([controller isKindOfClass:[NSClassFromString(name) class]]) {
            return YES;
        }
    }
    return NO;
}

五，取出导航控制器中的控制器VC

//  获取导航控制器中的FeedBackViewController
for (UIViewController *controller in VC.navigationController.viewControllers) {
                if ([controller isKindOfClass:[FeedBackViewController class]]) {
                    ((FeedBackViewController *)controller).inShotImage = image;
                    [VC.navigationController popViewControllerAnimated:YES];
                }else {

}
            };