angularjs - Black box appears only in iOS when navigating back to view in ionic -

i building ionic app , have login , register page.

when start app land on "login" page. can click on register , brings there. when come register state login state, have huge black bar appearing (i hid company logo in red) :

this routing code :

.state('login', {   url: '/',   templateurl: 'templates/login.html',   controller: 'logincontroller' }) .state('register', {   url: '/register',   templateurl: 'templates/register.html',   controller: 'registercontroller' });