NotificationCenter迁移swift 3到migrating 4.2问题

Question

我很难将代码从Swift 3迁移到Swift 4.2

下面是要迁移的当前代码：

fileprivate func observeKeyboardNotifications() {

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow), name: .UIKeyboardWillShow, object: nil)

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardHide), name: .UIKeyboardWillHide, object: nil)
}

以下是我所做的工作：

fileprivate func observeKeyboardNotifications() {

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow), name: NSNotification.Name.UIResponder.UIKeyboardWillShowNotification, object: nil)

}

但我还是发现了一个错误：

Type of expression is ambiguous without more context

我一整天都在编写代码，所以我甚至都看不出这段代码有什么问题。有人能帮我解决这个问题吗？

Answer 1

你把事情搞得太复杂了。

使用这段代码，Xcode 10将向您展示正确的修复-it建议。

fileprivate func observeKeyboardNotifications() {

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow),
                                           name: UIKeyboardWillShowNotification, object: nil)

}

我的Xcode 10已将其修复为：

fileprivate func observeKeyboardNotifications() {

    NotificationCenter.default.addObserver(self, selector: #selector(keyboardShow),
                                           name: UIResponder.keyboardWillShowNotification, object: nil)

}