Custom tab bar background image - in iOS 4.x

问题

I have made a tab bar iOS project, when I received the request to change the tab bar's background image to a custom image. The project is developed for iOS 4.x, so the iOS5's [tabBar setTabBarBackgroundImage:[UIImage imageNamed:@"custom.jpg"]] does not work. Can you suggest me some simple solutions (if there is any possibility, I would not like to change the entire project)?

Edit: Only three lines of code can resolve all:

UIImageView *imageView = [[UIImageView alloc] initWithImage:[UIImage imageNamed:@"customImage.png"]];
[self.tabBarController.tabBar insertSubview:imageView atIndex:0];
[imageView release];

回答1:

A possible solution would be to put an UIView with your background image exactly behind the UITabBar. Then lower the opacity of your tabbar to 0.5 so you can see the background-image coming through.

UIView *bckgrndView = [[UIView alloc] initWithFrame:CGRectMake(tabbar.frame.coords.x, tabbar.frame.coords.y, tabbar.frame.size.width, tabbar.frame.size.height)];
[bckgrndView setBackgroundImage:[UIImage imageNamed:@"custom.jpg"]];
[tabbar.superView insertSubView:bckgrndView belowSubview:tabbar];
tabbar.alpha = 0.5;
[bckgrndView release];

Sorry if my code contains some errors. I tried doing this by heart... But you'll catch the drift.

回答2:

I have answered similar kind of question here. Hope it will help.

回答3:

Check out NGTabBarController, an open source tab bar replacement with customizable background image.

来源：https://stackoverflow.com/questions/8709802/custom-tab-bar-background-image-in-ios-4-x