self

view

addSubview

button

];

void

showFlutter

FlutterEngine

flutterEngine

((

AppDelegate

UIApplication

sharedApplication

delegate

).

flutterEngine

FlutterViewController

flutterViewController

[[

FlutterViewController

alloc

initWithEngine

flutterEngine

nibName

nil

bundle

nil

];

self

presentViewController

flutterViewController

animated

YES

completion

nil

];

@end