UIViewController：调整 xib 的约束

Question

在我的项目中，我定义了一个 xib 和一个将包含 xib 的 ViewController。

class FeedDetailViewController: UIViewController, FeedDetailDelegate {

  var feedDetail: FeedDetail!

  override func viewDidLoad() {
    super.viewDidLoad()
    feedDetail = (NSBundle.mainBundle().loadNibNamed("FeedDetail", owner: self, options: nil)[0] as? UIView)! as! FeedDetail
    feedDetail.delegate = self;
    self.view.addSubview(feedDetail)
    self.adjustContraints()
  }

 func adjustContraints() { 

    feedDetail.sizeThatFits(self.view.frame.size)

    var constraint = NSLayoutConstraint(item: feedDetail,
        attribute: NSLayoutAttribute.Bottom, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 0)
    view.addConstraint(constraint)

    constraint = NSLayoutConstraint(item: feedDetail,
        attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Top, multiplier: 1, constant: 0)
    view.addConstraint(constraint)

    constraint = NSLayoutConstraint(item: feedDetail,
        attribute: NSLayoutAttribute.Trailing, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Trailing, multiplier: 1, constant: 0)
    view.addConstraint(constraint)

    constraint = NSLayoutConstraint(item: feedDetail,
        attribute: NSLayoutAttribute.Leading, relatedBy: NSLayoutRelation.Equal, toItem: view, attribute: NSLayoutAttribute.Leading, multiplier: 1, constant: 0)
    view.addConstraint(constraint)

    self.view.layoutIfNeeded()

}

我想要的只是 "fullscreen" 处的 xib，但 xib 边框不是 "sticked" 到控制器的主视图。

边框图例：

红色：self.view
黄色：feedDetail
其他：feedDetail 中的元素（仅测试）

Answer 1

尝试在添加约束之前调用此方法。

feedDetail.setTranslatesAutoresizingMaskIntoConstraints(false)

UIViewController：调整 xib 的约束

UIViewController: adjust contraints of xib

constraints

ios

swift