If you get this, the app has installed on your device. You have to tap the icon. It will ask you if you really want to run it. Say “yes” and then Build & Run again.
As from iOS 9, it is required to go to Settings → General → Device Management → Developer App → Trust`.
On some versions of iOS, you will have to go to Settings → General → Profile instead.

If you get this, the app has installed on your device. You have to tap the icon. It will ask you if you *really* want to run it. Say “`yes`” and then `Build & Run again`.
As from `iOS 9`, it is required to go to <kbd>Settings</kbd> → <kbd>General</kbd> → <kbd>Device Management</kbd> → <kbd>Developer App</kbd> → <kbd>Trust</kbd>`.
On *some* versions of `iOS`, you will have to go to <kbd>Settings</kbd> → <kbd>General</kbd> → <kbd>Profile</kbd> instead.