nslayoutconstraint

I have a couple views in my view controller that move up when an up swipe is detected then down when a down swipe is detected. I was forcing the views to move by adjusting the y origin using CGRectOffset. I've now applied constraints to my views with IB and I'm not sure whats the best way to move the views so that they end up in the right position on the iphone 5, 6, and 6+. Currently I'm doing something like this: [self.view layoutIfNeeded]; self.panFrameVerticalConstraint.constant = self.panFrameVerticalConstraint.constant +338; [UIView animateWithDuration:5 animations:^{ [self.view

I know how to modify a existing constraint. But I would to know if someone has found a solution to get a constraint without save this one as a property. Current solution to set Constraint height: 1) save NSLayoutConstraint in a variable: NSLayoutConstraint *heightConstraint = [NSLayoutConstraint constraintWithItem:myView attribute:NSLayoutAttributeHeight relatedBy:NSLayoutRelationEqual toItem:nil attribute:NSLayoutAttributeNotAnAttribute multiplier:1.0f constant:20]; [self.view addConstraint:heightConstraint]; 2) Set the constant of the Constraint saved to "0.0" ( to hide this view)

I have a custom UIView subclass which is being initialized via a nib. In -awakeFromNib , I'm creating a subview and attempting to center it in its superview. [self setInteralView: [[UIView alloc] init]]; [[self internalView] addConstraint: [NSLayoutConstraint constraintWithItem: [self internalView] attribute: NSLayoutAttributeCenterX relatedBy: NSLayoutRelationEqual toItem: self attribute: NSLayoutAttributeCenterX multiplier: 1 constant: 0]]; This breaks, and causes the following output: 2013-08-11 17:58:29.628 MyApp[32414:a0b] The view hierarchy is not prepared for the constraint:

I am trying to place UITextView inside UIScrollView with AutoLayout with no luck. What I have tried is, I placed UIScrollView inside the main view in Storyboard I placed UITextView inside UIScrollView in Storyboard and disabled Scrolling Enabled I set constraints (leading, trailing, top, bottom) on UIScrollView I set constraints (top, leading, trailing, height) on UITextView I created IBOutlet of height constraint of UITextView I set a text (a lot of text which can cause scrolling) on UITextView in viewDidLoad() I set a height constraint of UITextView with the code below. I have tried it right

Am new to Auto layout constraints in Xcode. I have one Bottom View like UITabBar with 6 UIButtons . Without constraints I aligned those buttons with 5 space padding with each buttons and each buttons has 50 width. Now,I am trying to make it by using Auto layout to support all Screen sizes. In Storyboard constrains I set equal width for 6 buttons and I made 60 space between each buttons. I set first button 0 to leading space and I set the last button 0 to tail constraints. I want the buttons with equal width and flexible spaces between views in all device sizes. Can anyone pleas help me?