自动布局警告“NSLayoutConstraint 正在配置超过内部限制的常量”

Question

我有一个名为 MyScrollView 的 UIScrollView 子类。 MyScrollView 中有一个名为 contentView 的子视图。宽度约束设置为 MyScrollView 的 contentSize。

   private func setupSubviews() {
      contentView = ContentView()
      contentView.backgroundColor = UIColor.blue
      contentView.translatesAutoresizingMaskIntoConstraints = false
      contentView.isUserInteractionEnabled = true
    
    
      self.addSubview(contentView)
    
      contentView.leadingAnchor.constraint(equalTo: self.leadingAnchor).isActive = true
      contentView.trailingAnchor.constraint(equalTo: self.trailingAnchor).isActive = true
      contentView.topAnchor.constraint(equalTo: self.topAnchor).isActive = true
      contentView.bottomAnchor.constraint(equalTo: self.bottomAnchor).isActive = true
      
      // create contentView's Width and Height constraints
      cvWidthConstraint = contentView.widthAnchor.constraint(equalToConstant: 0.0)
      cvHeightConstraint = contentView.heightAnchor.constraint(equalToConstant: 0.0)
           
    // activate them
      cvWidthConstraint.isActive = true
      cvHeightConstraint.isActive = true


      cvWidthConstraint.constant = myWidthConstant //<--- problem here if myWidthConstant is very high, such as 512000
      cvHeightConstraint.constant = frame.height
      contentView.layoutIfNeeded()
}

问题是，如果稍后我将 cvWidthConstraint.constant 设置为非常高的值，例如 521000，我会收到警告：

   This NSLayoutConstraint is being configured with a constant that exceeds internal limits.  A smaller value will be substituted, but this problem should be fixed. Break on BOOL _NSLayoutConstraintNumberExceedsLimit(void) to debug.  This will be logged only once.  This may break in the future.

我想知道如何将 UIScrollView 内容大小设置为非常高的值？