I resolved this issue by myself. I guess it was the fault of the documentation.
When we want to use Ionic as fullscreen mode, we have to write these code.
$ionicPlatform.ready ->
ionic.Platform.fullScreen()
if window.StatusBar
StatusBar.hide()
Sorry, it’s coffee script but it is same thing in Javascript, call ionic.Platform.fullScreen() and add fullscreen css class in the body tag.
I could not know this is the correct solution of fullscreen mode in iOS. But I could fix this issue.