UIViewController：调整xib的限制

Question

在我的项目中，我定义了一个xib和一个包含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xib在“全屏”，但xib边框并没有“贴”到控制器的主视图。

边境传奇：

• 红：self.view
• 黄：feedDetail
• 人：内feedDetail元素（仅测试）

Answer 1

试图调用此方法在添加约束之前。

feedDetail.setTranslatesAutoresizingMaskIntoConstraints(false)