Modify the height of the system tabbar

1. After creating UITabBarController, set UITabBar to (0 440; 320 40) and output NSLog (@ "% @", [self. view subviews]);
Generally, results like this are returned (
"<UITransitionView: 0x18dfb0; frame = (0 0; 320 431); clipsToBounds = YES; autoresize = W + H; layer = <CALayer: 0x192610> ",
"<UITabBar: 0x192ac0; frame = (0 440; 320 40); hidden = YES; autoresize = W + TM; layer = <CALayer: 0x192ba0>"
)
2. in this case, you will find that the frame of the UITransitionView is (0 0; 320 431). In fact, the gap height is 440-431 = 9. You only need to set the frame of the UITransitionView to (0 0; 320 440.
3. Generally, when creating UITabBarController, only the two views above are included.
For (UIView * view in self. view. subviews ){
If (! [View isKindOfClass: [UITabBar class]) {
View. frame = CGRectMake (0, 0,320,440 );
Break;
}
}