如何获得键盘的高度？ [英] How to get height of Keyboard?

问题描述

不同iOS设备上键盘的高度不同。有没有人知道如何以编程方式获得设备键盘的高度？

The height of a keyboard on varying iOS devices is different. Does anybody know how I can get height of a device's keyboard programmatically?

推荐答案

在Swift中：

您可以通过订阅 UIKeyboardWillShowNotification 通知来获得键盘高度。 （假设你想知道它显示之前的高度）。

You can get the keyboard height by subscribing to the UIKeyboardWillShowNotification notification. (Assuming you want to know what the height will be before it's shown).

这样的事情：

    NSNotificationCenter.defaultCenter().addObserver(self, selector: "keyboardWillShow:", name: UIKeyboardWillShowNotification, object: nil)

Swift 3

Swift 3

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

然后你可以在某些函数中访问高度：

Then you can access the height in some function like this:

func keyboardWillShow(notification:NSNotification) {
    let userInfo:NSDictionary = notification.userInfo!
    let keyboardFrame:NSValue = userInfo.valueForKey(UIKeyboardFrameEndUserInfoKey) as! NSValue
    let keyboardRectangle = keyboardFrame.CGRectValue()
    let keyboardHeight = keyboardRectangle.height
}

Swift 3

Swift 3

@objc func keyboardWillShow(_ notification: Notification) {
    if let keyboardFrame: NSValue = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue {
        let keyboardRectangle = keyboardFrame.cgRectValue
        let keyboardHeight = keyboardRectangle.height
    }
}

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