UIAlertController: addSubview

Question

我想给我的警报控制器添加一个子视图。但是为什么按钮在顶部呢？我该怎么解决这个问题？

    let alert = UIAlertController(title: nil, message: nil, preferredStyle: UIAlertControllerStyle.alert)

    let somethingAction = UIAlertAction(title: "Something", style: .default, handler: {(alert: UIAlertAction!) in print("something")})

    let cancelAction = UIAlertAction(title: "Annuler", style: .cancel, handler: {(alert: UIAlertAction!) in print("cancel")})

    alert.addAction(somethingAction)
    alert.addAction(cancelAction)

    let customView = UIView()
    customView.backgroundColor = .green
    customView.translatesAutoresizingMaskIntoConstraints = false
    customView.widthAnchor.constraint(equalToConstant: 128).isActive = true
    customView.heightAnchor.constraint(equalToConstant: 128).isActive = true

    alert.view.addSubview(customView)

    customView.centerXAnchor.constraint(equalTo: alert.view.centerXAnchor).isActive = true
    customView.topAnchor.constraint(equalTo: alert.view.topAnchor).isActive = true
    customView.bottomAnchor.constraint(equalTo: alert.view.bottomAnchor, constant: -32).isActive = true
    self.present(alert, animated: true, completion:{})

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Answer 1

UIAlertController是一个非常封闭的系统。它被设计成系统标准警报。您不应该向它添加子视图。

我将创建一个可以充当警报的自定义UIViewController。您可以使用自定义UIViewController转换使其看起来与UIAlertController一样。

还有许多GitHub项目提供您可能喜欢的自定义警报样式。比如这个：https://github.com/DominikButz/DYAlertController