- setAttributedText: 后，会自动滚动到文本中间的位置。
解决办法：
bottomTextView = UITextView()
bottomTextView.delegate = self
bottomTextView.backgroundColor = UIColor.clear
bottomTextView.isSelectable = true
bottomTextView.isEditable = false
bottomTextView.isUserInteractionEnabled = true
bottomTextView.linkTextAttributes = [:]
bottomTextView.attributedText = attributedString
// 使用主操作队列来确保恢复操作在“重置为0”之后发生
OperationQueue.main.addOperation {
self.bottomTextView.setContentOffset(CGPoint.zero, animated: false)
}
view.addSubview(bottomTextView)
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