ios - 当文本达到 N 行时开始滚动的 UITextView
<p><p>我开始在聊天应用中实现文本输入,我想知道启用滚动的 UITextView 的标准行为绝对不符合预期。<br/>
我只想在 WhatsApp 之类的聊天中完成。当文本达到 N,例如 5 行时,会出现滚动条并且文本容器开始滚动。我写了这样的代码,但它不起作用。
正如我认为需要计算文本容器中的行并制作内容插入或类似的东西。</p>
<pre><code> func textViewDidChange(_ textView: UITextView) {
let fixedWidth = myTextView.frame.size.width
myTextView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
let newSize = myTextView.sizeThatFits(CGSize(width: fixedWidth, height: CGFloat.greatestFiniteMagnitude))
var newFrame = myTextView.frame
let oldFrame = myTextView.frame
newFrame.size = CGSize(width: max(newSize.width, fixedWidth), height: newSize.height)
myTextView.frame = newFrame
let shift = oldFrame.height - newFrame.height
textView.contentInset = UIEdgeInsets(top: 0, left: 0, bottom: shift, right: 0)
textView.scrollIndicatorInsets = textView.contentInset
textView.scrollRangeToVisible(textView.selectedRange)
}
</code></pre>
<p>而myTextView被指定为:</p>
<pre><code>let myTextView : UITextView = {
let textView = UITextView()
textView.translatesAutoresizingMaskIntoConstraints =false
textView.isScrollEnabled = false
textView.textContainer.maximumNumberOfLines = 5
textView.textContainer.lineBreakMode = .byWordWrapping
textView.inputAccessoryView = UIView()
return textView
}()
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>不是基于行数,而是基于用户定义的高度。你会在这里找到你的答案:
<a href="https://stackoverflow.com/a/51235517/10115072" rel="noreferrer noopener nofollow">https://stackoverflow.com/a/51235517/10115072</a> </p></p>
<p style="font-size: 20px;">关于ios - 当文本达到 N 行时开始滚动的 UITextView,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/42235360/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/42235360/
</a>
</p>
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