透明视图背景变黑

Question

我想让视图控制器的视图半透明.为此,我在viewDidLoad方法中设置了这样的背景颜色.

view.backgroundColor = UIColor(white: 0, alpha: 0.5)

当显示视图控制器时,背景显示为我需要它然后它立即变黑.

为什么会这样？

这是显示以下内容的代码PopupViewController:

@IBAction func didTapShowButton(_ sender: UIButton) {
    let navController = UINavigationController(rootViewController: PopupViewController())
    present(navController, animated: true, completion: nil)
}

我也在这里上传了一个演示项目.

Answer 1

你可以添加标志overCurrentContext(或custom),所以你present 可能会这样:

@IBAction func didTapShowButton(_ sender: UIButton) {
    let navController = UINavigationController(rootViewController: PopupViewController())
    navController.modalPresentationStyle = .overCurrentContext
    present(navController, animated: true, completion: nil)
}