如何创建半透明（背后有内容）UITabBar

Question

I have subclassed UITabBar and overriden drawRect: method to make it transparent (and make it look like I need to). Problem I am having is that the view added to UITabBarController does not cover whole screen but ends 49 pixels above bottom, so even tho I have transparent tabbar, I can't see thing behind it.

Is there proper way how I can set size of UIView inside UITabBarController to cover entire screen?

PS:I know it is not good idea to show content behind tabbar. I do not want to show any content there, just art, that is specific to each View and needs to be visible through tabbar.

Answer 1

If you want to have content behind the UITabBar , I see two options:

• Don't use UITabBarController – This will definitely work, because you can position the views as you want and it is not so difficult to implement it.

• Try turning off clipsToBounds on the view and place some view out of his bounds.

   // UIViewController contained in UITabBarController: self.view.clipsToBounds = NO; UIView *viewBehindTabBar = [[UIView alloc] init]; viewBehindTabBar.frame = CGRectMake(0, self.view.bounds.size.height, self.view.bounds.size.width, 49); // autoresizing mask, background color, ... [self.view addSubview:viewBehindTabBar]; 

Answer 2

You can simply create a category of UITabBar or UITabBarController and set It's Alpha .

Something Like :-

@implementation UITabBarController (Translucent)
- (void)createImage
{
     [self.tabBar setAlpha:0.1];
}
@end

You can set Alpha even in Drawrect .