Swift中的ScrollView和键盘 [英] ScrollView and keyboard in Swift

问题描述

我开始创建一个简单的iOS应用，该应用可以执行一些操作.

I started creating a simple iOS app that does some operations.

但是当键盘出现时，我遇到了一些问题，隐藏了我的一个文本字段.

But I'm having some problems when the keyboard appears, hiding one of my textfields.

我认为这是一个普遍的问题，我做了一些研究，但找不到能解决我问题的任何东西.

I think it's a common problem and I did some research but I couldn't find anything that solved my problem.

我想使用ScrollView而不是为文本字段设置动画以使其可见.

I want to use a ScrollView rather than animate the textfield to make it visible.

推荐答案

在ViewDidLoad中，注册通知:

In ViewDidLoad, register the notifications:

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

在下面添加观察者方法，这些方法将在出现键盘时自动滚动.

Add below observer methods which does the automatic scrolling when keyboard appears.

@objc func keyboardWillShow(notification:NSNotification) {

    guard let userInfo = notification.userInfo else { return }
    var keyboardFrame:CGRect = (userInfo[UIResponder.keyboardFrameBeginUserInfoKey] as! NSValue).cgRectValue
    keyboardFrame = self.view.convert(keyboardFrame, from: nil)

    var contentInset:UIEdgeInsets = self.scrollView.contentInset
    contentInset.bottom = keyboardFrame.size.height + 20
    scrollView.contentInset = contentInset
}

@objc func keyboardWillHide(notification:NSNotification) {

    let contentInset:UIEdgeInsets = UIEdgeInsets.zero
    scrollView.contentInset = contentInset
}

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