ios 13 后会无法运行，如下修改

[SCSHICHUAN]

`- (UINavigationController *)navigationController {

UIWindow *window;

if (@available(iOS 13.0, *)) {
        window = [UIApplication sharedApplication].windows[0];
    } else {
        window = [UIApplication sharedApplication].delegate.window;
    }
return [self navigationControllerWithController:window.rootViewController];

}`