I think there is a bug in iOS. I have a search bar in the navbar of a root-page tab. When I click on the search bar to write something the keyboard comes up, then I press the cancel button to stop the search and the keyboard hides. But the tab bar stays up for about a second and then it goes to its original position.
Cordova CLI: 6.0.0
Ionic Version: 2.0.0-beta.0
Ionic CLI Version: 2.0.0-beta.17
Ionic App Lib Version: 2.0.0-beta.8
ios-deploy version: 1.8.5
ios-sim version: 5.0.6
OS: Mac OS X El Capitan
Node Version: v4.3.0
Xcode version: Xcode 7.2.1 Build version 7C1002
"angular2": "2.0.0-beta.2",
"es6-promise": "3.0.2",
"es6-shim": "0.33.13",
"ionic-framework": "2.0.0-beta.0",
"ionicons": "3.0.0-alpha.3",
"reflect-metadata": "0.1.2",
"rxjs": "5.0.0-beta.0",
"zone.js": "0.5.10"