iOS13 presentViewController样式调整

iOS13把UIViewController的UIModalPresentationStyle属性默认为UIModalPresentationPageSheet，效果变成下面这样：

需要在present页面时修改这个属性为UIModalPresentationFullScreen：

UIViewController *viewController = [[UIViewController alloc] init];
viewController.modalPresentationStyle = UIModalPresentationFullScreen;
[self persentViewController:viewController animated:YES completion:nil];