带有UIScrollView的UIViewController

Question

I'm trying to change a UIViewControllers view to a scroll view to make use :

def loadView
  super
  scrollView = UIScrollView.alloc.initWithFrame(UIScreen.mainScreen.bounds)
  self.view = scrollView
  # Tried experimenting with this
  # self.view.contentSize = CGSizeMake(UIScreen.mainScreen.bounds.size.width,, UIScreen.mainScreen.bounds.size.height)
  self.view.backgroundColor = UIColor.whiteColor
end

I then add subViews to self.view inside of viewDidLoad , use subview.setTranslatesAutoresizingMaskIntoConstraints(false) on each and then set constraints using NSLayoutConstraint.constraintsWithVisualFormat .

The constraints work fine normally, but as soon as I change the view to a scroll view, everything gets messed up:

The "title" field should be flush with the navigation bar, and both fields should fill the screen width.

The red box is simply demonstrating the width of the subviews.

Answer 1

Sometimes it's hard to get UIViews working with autoLayout inside of a UIScrollView. What i do in those cases is set a containerView that fills the UIScrollView four edges with constraints and positioning in autoLayout. Then in this container i add what i want, one thing that i always have to do is to keep track of the height of this container and make it grow accordingly to the subviews added to that. This way is a bit harder to implement the view hierarchy, but the constraints become more organized. Here is a note from Apple of how to do this in a quick way: https://developer.apple.com/library/ios/technotes/tn2154/_index.html