创建 UIAlertController 而不显示它会产生警告 [英] Creating UIAlertController without presenting it produces warning

问题描述

当创建一个 UIAlertController 而不显示它时，控制台会打印警告.为什么会这样?

override func viewDidLoad() {super.viewDidLoad()让 _ = UIAlertController(title: "title", message: "message", preferredStyle: .Alert)}

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不允许在解除分配时尝试加载视图控制器的视图，这可能会导致未定义的行为

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忽略此警告是否安全?如果 UIAlertController 已经创建并且我决定不展示/使用它，我该怎么办?

解决方案

尝试在 viewDidAppear 中编写代码它可能会解决您的问题

override func viewDidAppear(animated: Bool) {super.viewDidAppear(true)让 alertController = UIAlertController(title: "title", message: "message", preferredStyle: .Alert)}

When creating a UIAlertController without presenting it, a warning is printed in the console. Why is this so?

override func viewDidLoad() {
    super.viewDidLoad()
    let _ = UIAlertController(title: "title", message: "message", preferredStyle: .Alert)
}

Attempting to load the view of a view controller while it is deallocating is not allowed and may result in undefined behavior

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Edit:

Is this warning safe to ignore? If the UIAlertController is already created and I decide to not present/use it what should I do?

解决方案

Try to Write code in viewDidAppear it may solver your problem

override func viewDidAppear(animated: Bool) {
    super.viewDidAppear(true)
    let alertController = UIAlertController(title: "title", message: "message", preferredStyle: .Alert)
}

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