swift3.0 Tabbar

1. 设置文字颜色

viewController.tabBarItem.setTitleTextAttributes([NSForegroundColorAttributeName: UIColor.orange], for: UIControlState.selected)

2.去除图片的渲染颜色

viewController.tabBarItem.selectedImage = viewController.tabBarItem.selectedImage?.withRenderingMode(UIImageRenderingMode.alwaysOriginal)