Question

我有一个函数可以在其中创建一个带有schoolB_courses的数组UIStackViews：

UIButtons

然后我将该数组添加到func generateStackViews() -> [UIStackView] { var stackViewArray = [UIStackView]() let finalButtonArray = generateButtons() for buttons in finalButtonArray{ stackViewArray.append(createStackView(subViews: buttons)) } return stackViewArray }：

tableViewCell

一切正常，但当我尝试添加约束以将override func tableView(_ tableView: UITableView, cellForRowAt indexPath: IndexPath) -> UITableViewCell { let cell = tableView.dequeueReusableCell(withIdentifier: "First")! cell.contentView.addSubview(generateStackViews()[indexPath.row]) return cell }固定到单元格时，我收到此错误：

失败 - [UITableViewCell _layoutEngine_didAddLayoutConstraint：roundingAdjustment：mutualExclusiveConstraints：]

我尝试在创建stackViews和stackViews函数的函数中添加约束，尝试将其固定到cellForRowAt，单元格和contentView，但是没有工作，我得到了同样的错误信息。

我的逻辑在哪里失败？

Answer 1

以编程方式将此方法称为addContraints。

func addSubviewWithConstraint(to parentView: UIView, and childView: UIView, top:CGFloat, bottom:CGFloat, leading:CGFloat, trailing:CGFloat) {
    parentView.addSubview(childView)
    //Below line tells the view to not use AutoResizing
    childView.translatesAutoresizingMaskIntoConstraints = false
    // set top constraint
    let topConstraint = NSLayoutConstraint(item: childView, attribute: .top, relatedBy: .equal, toItem: parentView, attribute: .top, multiplier: 1, constant: top)
    // set Bottom constraint
    let bottomConstraint = NSLayoutConstraint(item: childView, attribute: .bottom, relatedBy: .equal, toItem: parentView, attribute: .bottom, multiplier: 1, constant: bottom)
    // set leading constraint
    let leadingConstraint = NSLayoutConstraint(item: childView, attribute: .leading, relatedBy: .equal, toItem: parentView, attribute: .leading, multiplier: 1, constant: leading)
    // set Bottom constraint
    let trailingConstraint = NSLayoutConstraint(item: childView, attribute: .trailing, relatedBy: .equal, toItem: parentView, attribute: .trailing, multiplier: 1, constant: trailing)
    //Add all constraints to parentView
    parentView.addConstraint(topConstraint)
    parentView.addConstraint(bottomConstraint)
    parentView.addConstraint(leadingConstraint)
    parentView.addConstraint(trailingConstraint)
}

并像这样调用上述方法。

self.addSubviewWithConstraint(to: cell.contenetView, and: stackView, top: 0, bottom: 0, leading: 0, trailing: 0)

如何以编程方式在UITableViewCell swift中为UIStackView添加约束？

1 个答案: