Question

我在XCode6中遇到自动布局，所以我试图在代码中设置约束。我有一个覆盖大部分屏幕的scrollview。在scrollview中，我放置了一个按钮，一个imgview和一个textview。该按钮是一个固定的44px，现在我想在imgview和textview之间拆分滚动视图的左边（导致它们的大小相同）。

这是我的SubViewsDidLoad函数：

override func viewDidLayoutSubviews() {
    super.viewDidLayoutSubviews()
    let screenSize: CGRect = UIScreen.mainScreen().bounds
    let screenWidth = screenSize.width;
    let screenHeight = screenSize.height;
    let scrollViewTop = self.navigationBar.frame.height + self.navigationBar.frame.minY
    let scrollViewBottom = self.toolBar.frame.height


 // set scrollView frame

    println ("navigationbarTop: ", scrollViewTop)
    println ("toolbarHeight: ", scrollViewBottom)
    self.scrollView.frame = CGRect(x: 0, y: scrollViewTop, width: screenWidth, height: screenHeight-(scrollViewTop+scrollViewBottom))

// set btnLocation size & constraints

    self.view.addConstraint(NSLayoutConstraint(item:self.btnLocatie, attribute:.CenterX, relatedBy:.Equal, toItem:self.view,attribute:.CenterX, multiplier:1, constant:0))
    self.view.addConstraint(NSLayoutConstraint(item:self.btnLocatie, attribute:.Top, relatedBy:.Equal, toItem:self.scrollView,attribute:.Top, multiplier:1, constant:8))
    self.view.addConstraint(NSLayoutConstraint(item:self.btnLocatie, attribute:.Left, relatedBy:.Equal, toItem:self.scrollView,attribute:.Left, multiplier:1, constant:8))

 // set imageview size & constraints

    //X - align to center
    self.view.addConstraint(NSLayoutConstraint(item: self.imgAfbeelding, attribute:.CenterX, relatedBy:.Equal, toItem:self.view, attribute:.CenterX, multiplier:1, constant:0))
    //Top - Scrollview+8
    self.view.addConstraint(NSLayoutConstraint(item:self.imgAfbeelding, attribute:.Top, relatedBy:.Equal, toItem:self.btnLocatie, attribute:.Bottom, multiplier:1, constant:+8))
    //Left - scrollview leftside+8
    self.view.addConstraint(NSLayoutConstraint( item:self.imgAfbeelding, attribute:.Left, relatedBy:.Equal, toItem:self.scrollView, attribute:.Left, multiplier:1, constant:8))
    //Size - scrollView size
    self.view.addConstraint(NSLayoutConstraint(item:self.imgAfbeelding, attribute:.Bottom, relatedBy:.Equal, toItem:self.scrollView, attribute:.Bottom, multiplier:1, constant:(scrollView.frame.height-btnLocatie.frame.height+16)/2))

 // set textview size & constraints

    self.view.addConstraint(NSLayoutConstraint( item:self.txtTekst, attribute:.Left, relatedBy:.Equal, toItem:self.scrollView, attribute:.Left, multiplier:1, constant:0))

    self.view.addConstraint(NSLayoutConstraint(item: self.txtTekst, attribute:.Top, relatedBy:.Equal, toItem:self.imgAfbeelding, attribute:.Bottom, multiplier:1, constant:+8))

    self.view.addConstraint(NSLayoutConstraint(item:self.txtTekst, attribute:.Bottom, relatedBy:.Equal, toItem:self.scrollView, attribute:.Bottom, multiplier:1, constant:scrollView.frame.height-8))
 }

当我运行代码时，一开始看起来一切都很好。但是当我旋转设备时，控制台会显示很多约束错误，并且图像视图和textview的位置和大小完全关闭。

我猜测有更好的方法让它正常工作，但我似乎无法让它工作。任何人都可以帮助我吗？

Answer 1

试试这个

self.btnLocatie.setTranslatesAutoresizingMaskIntoConstraints(false)
self.imgAfbeelding.setTranslatesAutoresizingMaskIntoConstraints(false)

布局约束错误

1 个答案: