UITabBar背景替换

//---- For providing background image to tabbar
UITabBar*tabBar =[tabBarController tabBar]; 

if([tabBar respondsToSelector:@selector(setBackgroundImage:)]){
    // ios 5 code here
    [tabBar setBackgroundImage:[UIImage imageNamed:@"image.png"]];
} 
else{
    // ios 4 code here
    CGRect frame =CGRectMake(0,0,480,49);
    UIView*tabbg_view =[[UIView alloc] initWithFrame:frame];
    UIImage*tabbag_image =[UIImage imageNamed:@"image.png"];
    UIColor*tabbg_color =[[UIColor alloc] initWithPatternImage:tabbag_image];
    tabbg_view.backgroundColor = tabbg_color;
    [tabBar insertSubview:tabbg_view atIndex:0];
}