ios - UItabar不能变色或透明

Question

我已经实现了下面的代码，使 tabBar 透明，但它根本没有生效，我错过了什么吗？我在 UItabbarcontroller 中有这段代码。

 mainTabbar.barTintColor = .clear
 mainTabbar.tintColor = .black

 mainTabbar.backgroundImage = UIImage()
 mainTabbar.shadowImage = UIImage()

Answer 1

使用这个

func configureTabBar(tabBarController:UITabBarController) {
        //Tab bar customization
        tabBarController.tabBar.backgroundImage = coloredImage(size: UIScreen.main.bounds.size, restrictedToRect: CGRect(x: 0, y: 0, width: (tabBarController.tabBar.frame.size.width),height: (tabBarController.tabBar.frame.size.height)), color: UIColor.clear)
        tabBarController.tabBar.shadowImage = UIImage()
    }

然后使用这个方法创建清晰的颜色UIImage

func coloredImage(size:CGSize,restrictedToRect:CGRect,color:UIColor) -> UIImage{

    let colorView = UIView(frame: CGRect(origin:CGPoint(x: 0, y: 0) , size: size))
    colorView.backgroundColor = color
    colorView.contentScaleFactor = UIScreen.main.scale

    UIGraphicsBeginImageContextWithOptions(restrictedToRect.size, false, UIScreen.main.scale)
    colorView.layer.render(in: UIGraphicsGetCurrentContext()!)
    let image = UIGraphicsGetImageFromCurrentImageContext()
    UIGraphicsEndImageContext()
    return image!
}

使用示例

if let tabBarController = self.window?.rootViewController as? UITabBarController {
        self.configureTabBar(tabBarController: tabBarController)
}