我UITabBar为此设置了自定义指标图像
UIImage *tabBarSelectedImage = [[UIImage imageNamed:@"tabBar_selected"] resizableImageWithCapInsets:UIEdgeInsetsMake(0, 0, 0, 0)];
[[UITabBar appearance] setSelectionIndicatorImage:tabBarSelectedImage];
并在我的周围获得4px填充tabBarSelectedImage.是否可以将填充设置为0px？这样我tabBarSelectedImage填满了整个空间,没有边框可见？