修改tabBarItem  默认图片和选中时的图片

UITabBarItem* item1 = [self.tabBar.items objectAtIndex:0];
    item1.p_w_picpath = [[UIImage p_w_picpathNamed:@"icon_video"] p_w_picpathWithRenderingMode:UIImageRenderingModeAlwaysOriginal];
    item1.selectedImage = [[UIImage p_w_picpathNamed:@"icon_video_on"] p_w_picpathWithRenderingMode:UIImageRenderingModeAlwaysOriginal];