IOS searchBar 修改背景颜色

if (CurrentSystemVersion >=7.1) {

        [[[[searchBar.subviewsobjectAtIndex:0]subviews] objectAtIndex:0]removeFromSuperview];

        [searchBar setBackgroundColor:[UIColorclearColor]];

    }elseif(CurrentSystemVersion <7.0){

        [[searchBar.subviewsobjectAtIndex:0]removeFromSuperview];

        [searchBar setBackgroundColor:[UIColorclearColor]];

    }else{

    

        [searchBarsetBarTintColor:[UIColorclearColor]];

        [searchBar setBackgroundColor:[UIColorclearColor]];

    }