vc1.tabBarItem = [[UITabBarItem alloc]initWithTitle:@"动态" p_w_picpath:[self OriginalImageName:@"tabbar_icon_auth"] selectedImage:[self OriginalImageName:@"tabbar_icon_auth_click"]];
- (UIImage *)OriginalImageName:(NSString *)p_w_picpathName
{
    return [[UIImage p_w_picpathNamed:p_w_picpathName] p_w_picpathWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
}


2.调整tabbaritem中某个图片的位置方法
vc3.tabBarItem.p_w_picpathInsets = UIEdgeInsetsMake(5, 0, -5, 0);
//字体属性设置
[vc1.tabBarItem setTitleTextAttributes:[NSDictionary dictionaryWithObjectsAndKeys:[UIColor blackColor],NSForegroundColorAttributeName, nil] forState:UIControlStateNormal];