setTitle

"Show Flutter!"

for

UIControl

State

normal

button

frame

CGRect

80.0

210.0

width

160.0

height

40.0

button

backgroundColor

UIColor

blue

self

view

addSubview

button

@objc

func

showFlutter

()

let

flutterEngine

UIApplication

shared

delegate

as!

AppDelegate

flutterEngine

let