Defaults to UIModalPresentationAutomatic on iOS starting in iOS 13.0, and UIModalPresentationFullScreen on previous versions. Defaults to UIModalPresentationFullScreen on all other platforms.
IOS13以前控制器UIModalPresentationStyle默認是UIModalPresentationFullScreen,
而IOS13控制器UIModalPresentationStyle默認是UIModalPresentationAutomatic（卡片樣式）,
因此IOS13模態(tài)跳轉(zhuǎn)的界面會以卡片的樣式展示窖壕；
解決辦法：
UIViewController *vc = [[UIViewController alloc] init];
[vc setModalPresentationStyle:UIModalPresentationFullScreen];
[self presentViewController:vc animated:YES completion:nil];
