ios - 在 IQKeyboardManager 中始终保持视图位于顶部（不要使用键盘滚动）

Question

我用IQKeyboardManager键盘输入后保持文本字段上升。

即使单击文本字段，我也不想滚动到特定视图。下面是设计的截图。我希望“标题”保持在顶部。

从他们的文档中，有一种方法可以使导航栏保持在顶部。

Answer 1

为您的 ViewController 禁用 IQKeyboardManager。

为了那个原因，

IQKeyboardManager.sharedManager().disableInViewControllerClass(ViewController.self)

并在该 viewController 中编写以下代码。它会根据键盘高度向上移动您的视图

override func viewDidLoad() {
        super.viewDidLoad()

        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(ViewController.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)

}

func keyboardWillShow(notification: NSNotification) {

        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0 {
                self.view.frame.origin.y -= keyboardSize.height
            }
        }
}

func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y != 0 {
                self.view.frame.origin.y += keyboardSize.height
            }
        }
}

现在您希望您的“ HEADER ”视图保持在顶部，

这样做：

**

YourViewController.view -> [headerView][contentView]

**

将文本字段放入 [contentView] 并在上面的代码中更改 [contentView].y 而不是 Self.view。

Answer 2

IQKeyboardManager为您禁用viewController：

override func viewWillAppear(animated: Bool) {
        super.viewWillAppear(animated)
        IQKeyboardManager.sharedManager().enable = false

        NotificationCenter.default.addObserver(self, selector: #selector(Login.keyboardWillShow), name: NSNotification.Name.UIKeyboardWillShow, object: nil)
        NotificationCenter.default.addObserver(self, selector: #selector(Login.keyboardWillHide), name: NSNotification.Name.UIKeyboardWillHide, object: nil)
}

手柄键盘：

func keyboardWillShow(notification: NSNotification) {

        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y == 0{
            self.table_view.frame.origin.y -= keyboardSize.height
            }
        }
    }

func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = (notification.userInfo?[UIKeyboardFrameBeginUserInfoKey] as? NSValue)?.cgRectValue {
            if self.view.frame.origin.y != 0{
            self.table_view.frame.origin.y += keyboardSize.height
            }
        }
    }

移除观察者：

override func viewWillDisappear(animated: Bool) {
        IQKeyboardManager.sharedManager().enable = true
        NSNotificationCenter.defaultCenter().removeObserver(self)    
    }

Answer 3

@Wolverine 和 @Bhavin Ramani 的回答很棒：让自定义标题保持在顶部的最佳方法是手动处理键盘（根据 IQKeyboardSwift 作者的评论）。如果您使用 iOS 默认导航栏，它似乎是由库为您处理的。

在这里我只想分享一些关于这个主题的更新，以供我将来参考，因为答案有点老了，而且一些 Swift 语法已经改变。下面的代码是用 Xcode 13.2 编写的，面向 iOS 13+。

首先，您想通过执行禁用 KQKeyboardManager

IQKeyboardManager.shared.enable = false

请注意，此行仅禁用将文本字段向上移动功能，其他 IQKeyboard 功能（例如外部触摸时退出、自动工具栏等）不会被此行禁用，这通常是您想要的。

然后，您在视图控制器中注册键盘事件观察者，在 .viewDidLoad中删除观察者deinit。

    override func viewDidLoad() {
        super.viewDidLoad()

        IQKeyboardManager.shared.enable = false

        NotificationCenter.default.addObserver(self,
                                               selector: #selector(keyboardWillShow),
                                               name: UIResponder.keyboardWillShowNotification,
                                               object: nil)
        
        NotificationCenter.default.addObserver(self,
                                               selector: #selector(keyboardWillHide),
                                               name: UIResponder.keyboardWillHideNotification,
                                               object: nil)
    }

    deinit {
        IQKeyboardManager.shared.enable = true
        NotificationCenter.default.removeObserver(self)
    }

接下来，为键盘显示/隐藏添加视图向上/向下移动方法。

    @objc private func keyboardWillShow(notification: NSNotification) {     
        if let keyboardSize = notification.userInfo?[UIResponder.keyboardFrameEndUserInfoKey] as? CGRect {
            print("keyboardSize.height", keyboardSize.height)
            // using the right key here is important, because 
            // keyboardFrameEndUserInfoKey is an user info key 
            // to retrieve the keyboard’s frame at the END of its animation.

            // here you move up the views you need to move up
            // if you use auto layout, update the corresponding constraints
            // or you update the views' frame.origin.y
            // you may want to do the updates within a 0.25s animation
        }
    }

    @objc private func keyboardWillHide(notification: NSNotification) {
        if let keyboardSize = notification.userInfo?[UIResponder.keyboardFrameBeginUserInfoKey] as? CGRect {
            // reset views to their original position on keyboard dismiss
        }
    }

您可能还想启用/禁用自动工具栏，因为它可能会使您的键盘高度不稳定。

// in viewDidLoad set to false, in deinit set back to true (if you need it)
IQKeyboardManager.shared.enableAutoToolbar = false