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Questions tagged [nslayoutanchor]

44 questions
40
votes
3 answers

On iOS, what are the differences between margins, edge insets, content insets, alignment rects, layout margins, anchors...?

There seem to be several different options/terms and people in the iOS community use with respect to layout (e.g. UIEdgeInsets is a type, but sometimes I hear/read "set the insets" or layout margins vs layout guides). I've always been able to find…
kraeon
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Is layoutMarginsGuide seems to be kind of excessive?

When i was trying to create layout constraints, i read about NSLayoutAnchor class. They said: Note UIView does not provide anchor properties for the layout margin attributes. Instead, the layoutMarginsGuide property provides a UILayoutGuide…
Ninja
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Unable to activate constraint with anchors because they have no common ancestor

I have added a view called myView in interface builder as can be seen in the code below and have added this to the main view as a subview, I have then added three buttons programatically. I have added these as subviews to the main view before trying…
Marcus Levi
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1 answer

Add multiplier to NSLayoutAnchor constraints in Swift

Anchor constraints simplify adding constraints but the multiplier property available in storyboard does not seem to be available for all types of constraints. For example, as per the answer here, you can center a label in a view…
user6631314
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3
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1 answer

How to update anchor constraint in swift

I would like to create a menu like android in iOS. I'm using layout constraints to setup constraints. I'm facing the issue when I'm trying to update the left constraint of an image on button click (It should animate to clicked button's position).…
Damodar
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Generics to consolidate NSLayoutAnchor

I want to consolidate the NSLayoutDimension NSLayoutXAxisAnchor and NSLayoutYAxisAnchor to create a wrapper for my anchors to avoid a long list of convenience methods The ideal syntax I was looking for was extension UIView { func example() { …
Magoo
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2 answers

How can I get the height of a view if I set its anchors

I am currently trying to access the height of a view which I previously set anchors for. So for example, I set the left, right, top, and bottom anchors of searchTable using the following in my…
kbunarjo
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"Cannot convert value of type 'NSLayoutDimension' to expected argument type NSLayoutAnchor

I am trying to add a subview in my Swift 3 tableView. I want the leading anchor to be related to 0.05 x the width of my parent view( tableView). When I write the following: modalView.leadingAnchor.constraint(equalTo:margins.widthAnchor, constant:…
Thalatta
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NSLayoutConstraint negative multiplier gives unexpected results

We are using Xcenter and Ycenter NSLayoutConstraint to position subview inside parent superview. As we need to keep the position proportional we can't use the constant value of the constraints to position it, it needs to be based purely on the…
Roi Mulia
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3 answers

heightAnchor.constraint not change height of view

I use this code: func show(){ view.translatesAutoresizingMaskIntoConstraints = false view.leftAnchor.constraint(equalTo: view.leftAnchor, constant: 0).isActive = true view.topAnchor.constraint(equalTo: view.topAnchor, constant:…
Mohammad
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Is using NSLayoutAnchor bad?

I usually use NSLayoutAnchor but many times I have been advised to not use it. Is there any problem with it such as performance drop besides more complex/longer code? I've been told to use: let myView = UIView(frame: CGRect(x: 0, y: 20, width:…
Sin Sopheak
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1 answer

Console warning when using NSLayoutAnchor.constraintEqualToSystemSpacingAfter

I am using NSLayoutAnchor's constraintEqualToSystemSpacingAfter for building my layout. NSLayoutConstraint.activate([ customView.leadingAnchor.constraintEqualToSystemSpacingAfter(safeAreaLayoutGuide.leadingAnchor, multiplier: 1) ]) It actually…
Tamás Sengel
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iOS - anchor view to the top of the screen, behind status bar

I've a CollectionViewController with the default status bar and all it's embedded in a NavigationController. I'm trying to reproduce an effect in which I have a View anchored to the top of the screen, since my navController is fully transparent and…
Ivan Cantarino
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Compile error in extension NSLayoutAnchor

I am trying to create an extension method on NSLayoutAnchor to accept a multiplier. I get a weird Swift compile error (Swift 3, XCode 8.2.1) not in the extension file but in the corresponding .h file (this file is automatically generated by the…
andrewz
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Subview that clips to parent view in Swift

I'm trying to add a subview that would always have the same size as its parent, so that it would always resize if the parent size changes. I was thinking about adding (top, bottom, leading, trailing) constraints from the code. When I add the…
Xys
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