有几个选择可以尝试…
首先，子类UIScrollView：

class MyScrollView: UIScrollView {
    override func scrollRectToVisible(_ rect: CGRect, animated: Bool) {
        // don't do anything
    }
}

这将防止内置的“自动滚动”时，文本视图是活跃的。
第二种选择：

• 在“容器滚动视图”中嵌入文本视图
• 禁用 that 滚动视图的滚动
• 将文本视图约束为滚动视图的.frameLayoutGuide，以便文本视图控制容器滚动视图的大小
• 将容器滚动视图添加为“内容”视图的子视图

现在，当文本视图处于“活动”状态时，它的“容器”滚动视图将接收自动滚动消息，而不是“主”滚动视图。
当然，在任何一种情况下，您的代码都将负责管理保持插入点可见所需的任何水平/垂直滚动。

编辑

第二个选项的快速示例：

class ViewController: UIViewController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        let tv = UITextView()
        let tvsv = UIScrollView()
        let cv = UIView()
        let sv = UIScrollView()
        
        [tv, tvsv, cv, sv].forEach { v in
            v.translatesAutoresizingMaskIntoConstraints = false
        }
        tvsv.addSubview(tv)
        cv.addSubview(tvsv)
        sv.addSubview(cv)
        view.addSubview(sv)
        
        let g = view.safeAreaLayoutGuide
        let cg = sv.contentLayoutGuide
        let fg = sv.frameLayoutGuide
        
        let tsfg = tvsv.frameLayoutGuide
        
        NSLayoutConstraint.activate([
            
            tv.topAnchor.constraint(equalTo: tsfg.topAnchor, constant: 0.0),
            tv.leadingAnchor.constraint(equalTo: tsfg.leadingAnchor, constant: 0.0),
            tv.trailingAnchor.constraint(equalTo: tsfg.trailingAnchor, constant: 0.0),
            tv.bottomAnchor.constraint(lessThanOrEqualTo: tsfg.bottomAnchor, constant: 0.0),
            
            tv.widthAnchor.constraint(equalToConstant: 600.0),

            tvsv.topAnchor.constraint(equalTo: cv.topAnchor, constant: 20.0),
            tvsv.leadingAnchor.constraint(equalTo: cv.leadingAnchor, constant: 20.0),
            tvsv.bottomAnchor.constraint(lessThanOrEqualTo: cv.bottomAnchor, constant: -20.0),
            
            tv.widthAnchor.constraint(equalToConstant: 600.0),
            

            cv.topAnchor.constraint(equalTo: cg.topAnchor, constant: 20.0),
            cv.leadingAnchor.constraint(equalTo: cg.leadingAnchor, constant: 20.0),
            cv.trailingAnchor.constraint(equalTo: cg.trailingAnchor, constant: -20.0),
            cv.bottomAnchor.constraint(equalTo: cg.bottomAnchor, constant: -20.0),
            
            cv.widthAnchor.constraint(equalToConstant: 1000.0),
            
            sv.topAnchor.constraint(equalTo: g.topAnchor, constant: 20.0),
            sv.leadingAnchor.constraint(equalTo: g.leadingAnchor, constant: 20.0),
            sv.trailingAnchor.constraint(equalTo: g.trailingAnchor, constant: -20.0),
            sv.bottomAnchor.constraint(equalTo: g.bottomAnchor, constant: -20.0),
            
        ])
        
        tv.isScrollEnabled = false
        tvsv.isScrollEnabled = false

        // so we can see the framing
        tv.backgroundColor = .yellow
        cv.backgroundColor = .systemBlue
        sv.backgroundColor = .systemRed
        view.backgroundColor = .systemYellow
        
    }
    
}

注意：我没有实现任何手动处理滚动视图内容偏移量的代码，这是保持插入点可见所必需的。然而，这将证明“自动滚动”不再有效。