找出UIKeyboard.frame与其他框架何时相交? [英] Find out when UIKeyboard.frame intersects with other frame?

问题描述

我需要找出文本字段何时成为第一个响应者，以通知我将要显示的键盘是否会阻塞UITextField.如果可以，我想调整scrollview属性.

I need to find out when the textfield becomes the first responder to notify me whether the keyboard that's going to show will obstruct the UITextField. If it does, I wanna adjust the scrollview properties.

到目前为止，我已经进行了此设置.我正在监听UIKeyboardWillShow通知，该通知调用以下选择器:

So far I have this setup. I'm listening for UIKeyboardWillShow notifications that calls the following selector:

func keyboardWillAppear(notification:NSNotification)
{
    if let keyboardSize = (notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? NSValue)?.cgRectValue
    {

        if keyboardSize.intersects(textField.frame)
        {
            print("It intersects")
        }
        else
        {
            print("Houston, we have a problem")
        }
    }

注意:我尝试使用UIKeyboardDidShow，但仍然没有成功. UITextField是scrollView的子视图.

Note: I tried with UIKeyboardDidShow but still no success. UITextField is a subview of the scrollView.

推荐答案

1. 听听键盘的大小变化
2. 转换坐标

工作示例:

 @IBOutlet weak var textView: UITextView!
 override func viewDidLoad() {
    super.viewDidLoad()

    //keyboard observers
    NotificationCenter.default.addObserver(self, selector: #selector(keyboardWillChange), name: NSNotification.Name.UIKeyboardWillChangeFrame, object: nil)
}

func keyboardWillChange(notification:NSNotification)
{
    print("Keyboard size changed")

    if let keyboardSize = notification.userInfo?[UIKeyboardFrameEndUserInfoKey] as? CGRect {
        //convert gotten rect
        let r = self.view.convert(keyboardSize, from: nil)

        //test it
        if r.intersects(textView.frame) {
            print("intersects!!!")
        }
    }
}

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