ios,swift,autolayout , animating a view on top of uitableview
animating a view on top of uitableview
Question:
Tag: ios,swift,autolayout
I have a UINavigationController that has my custom ViewController with a tableView in it that takes up the whole screen.
I want to push down the tableView and reveal a settings menu with just a couple items. My SettingsView.xib I created in a separate nib that is 320 x 90 and just has a single UISegmentedControl in it.
I have an Outlet for the NSLayoutConstraint I created between the tableView and the top layout guide. When my settingsButton is pressed, I do this
func showSettings(sender: UIBarButtonItem) {
println(String(format: "%@", NSStringFromCGRect(settingsView.frame)))
println(String(format: "tableview %@", NSStringFromCGRect(tableView.frame)))
isSettingsOpen = !isSettingsOpen
settingsHeightConstraint.constant = isSettingsOpen ? 90.0 : -64.0
UIView.animateWithDuration(1.0, delay: 0.0, usingSpringWithDamping: 0.4, initialSpringVelocity: 8.0, options: .CurveEaseIn, animations: {
self.view.layoutIfNeeded()
}, completion: nil)
}
That part slides down as I expect. Then I added the settingsView like so:
lazy var settingsView: UIView = self.initializeSettingsView()
func initializeSettingsView() -> UIView {
let nib = UINib(nibName: "SettingsView", bundle: nil)
let nibView = nib.instantiateWithOwner(self, options: nil)[0] as! UIView
return nibView;
}
// in viewDidLoad
settingsView.center.y -= self.settingsView.frame.height
view.addSubview(settingsView)
var constraints = [NSLayoutConstraint]()
constraints.append(NSLayoutConstraint(item: settingsView, attribute: NSLayoutAttribute.Bottom, relatedBy: .Equal, toItem: tableView, attribute: .Top, multiplier: 1.0, constant: 0.0)) // this constraint seems to be the problem one
constraints.append(NSLayoutConstraint(item: settingsView, attribute: .Left, relatedBy: .Equal, toItem: tableView, attribute: .Left, multiplier: 1.0, constant: 0.0))
constraints.append(NSLayoutConstraint(item: settingsView, attribute: .Right, relatedBy: .Equal, toItem: tableView, attribute: .Right, multiplier: 1.0, constant: 0.0))
NSLayoutConstraint.activateConstraints(constraints)
Then I get ambiguous layout. I know that the height constraint that I try to animate and the first constraint that I put a comment on are conflicting with each other because if I comment one of those lines out, I don't get the error message.
What I'm trying to do with that first constraint is just have the settingsView "pinned" to the edge of the tableView so that way when I animate the tableView moving downwards by 90.0 then the settingsView would go with it.
This doesn't seem to be the case and I can't figure out why. I haven't really done much with animating views when constraints are involved. Did I set this up correctly? Do I need to remove one of the constraints and then add a different one? Thanks in advance.
Answer:
In initializeSettingsView() add nibView.setTranslatesAutoresizingMaskIntoConstraints(false). And then in viewDidload add the hight constraint to settingsView
constraints.append(NSLayoutConstraint(item: settingsView, attribute: .Height, relatedBy: .Equal, toItem: nil, attribute: .NotAnAttribute, multiplier: 1.0, constant: 90.0))
And you do not need to set the position of settingsView, since it will be layout at the right position based on the constraints you add. So just remove settingsView.center.y -= settingsView.frame.size.height
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