UISegmentedControl is hidden under the titleBar - ios

Question

i guess i am missing something with the UISegmentedControl and auto layout.
i have a TabbedApplication (UITabBarController), and i created a new UIViewController to act as tab.
to the new view i added UISegmentedControl, and place it to top using auto layout.
i guess i don't understand completely something ,
cause the UISegmentedControl is hiding under the titleBar
. can u help me understand what i am missing ?
thank you .
import Foundation
import UIKit;
class ViewLikes:UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
title = "some title";
var segmentControl:UISegmentedControl = UISegmentedControl(items:["blash", "blah blah"]);
segmentControl.selectedSegmentIndex = 1;
segmentControl.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(segmentControl)
//Set layout
var viewsDict = Dictionary <String, UIView>()
viewsDict["segment"] = segmentControl;
//controls
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[segment]-|",
options: NSLayoutFormatOptions.AlignAllCenterX,
metrics: nil,
views: viewsDict))
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("V:|-[segment]",
options: NSLayoutFormatOptions(0),
metrics: nil,
views: viewsDict))
}
override func didReceiveMemoryWarning() {
super.didReceiveMemoryWarning()
// Dispose of any resources that can be recreated.
}
}

Answer 1

Your top space vertical constraint has to be related to your Top Layout Guide, not to your container margin. The following code should fix this problem:
override func viewDidLoad() {
super.viewDidLoad()
let segmentControl = UISegmentedControl(items:["blash", "blah blah"])
segmentControl.selectedSegmentIndex = 1
segmentControl.setTranslatesAutoresizingMaskIntoConstraints(false)
self.view.addSubview(segmentControl)
//Horizontal constraints
view.addConstraint(NSLayoutConstraint(item: segmentControl, attribute: NSLayoutAttribute.Top, relatedBy: NSLayoutRelation.Equal, toItem: self.topLayoutGuide, attribute: NSLayoutAttribute.Bottom, multiplier: 1, constant: 10))
//Horizontal constraints
let viewsDict = ["segment" : segmentControl]
self.view.addConstraints(NSLayoutConstraint.constraintsWithVisualFormat("H:|-[segment]-|", options: NSLayoutFormatOptions(0), metrics: nil, views: viewsDict))
}
Note that the horizontal constraints setting has also been rewritten.