Ionic dev app work perfect on android but not work on ios

Hi everyone, i am newbie of ionic v4, i am having with dev app on ionic, when i test dev app on android it work perfect, you can look at image below:

but when i test dev app on ios it work but not show action when i click and not show sidebar icon too, like this :

i am using laptop and run window 10
i hope someone can help me fix this problem, thank you everyone.