45 questions
-2
votes
2
answers
74
views
How do you, or can you, create and/or "adjust" an NSLayoutAnchor property?
Say you have some large complex custom view,
lazy var pinkThing: ..
lazy var greenThing: ..
And you want to
///For upstream views to use as they wish
var pinkCenterY: NSLayoutYAxisAnchor {
return ...
- 12.5k
0
votes
1
answer
374
views
Unable to activate constraint with anchors.... because they have no common ancestor
I am attempting to create a Swift-based UI programmatically that resembles the layout shown below
Below is my view hierarchy which I created using xib. Now I'm attempting to achieve the same through ...
- 801
0
votes
0
answers
51
views
LazyVGrid NSLayoutConstraint conflict
I have a LazyVGrid with minimum width and height for the cells, and the cells have a 10p padding constraint. I get this type of error :
(
"<NSAutoresizingMaskLayoutConstraint:0x282eb3020 h=...
- 10.6k
0
votes
1
answer
73
views
Why these NSView subclass instances do not get initialised [Objective-C]?
I am trying to understand how NSLayoutAnchor works in Objective-C by converting a simple Swift app to it. The Swift app creates an NSView subclass which sets its layer's background color to a randomly ...
- 410
0
votes
0
answers
115
views
Terminating app due to uncaught exception 'NSInvalidArgumentException' Unknown layout attribute'
I am trying to give vertical space constraint programatically for Admob native ads compenents by using NSLayoutConstraint.
I assigned nativeAdView in the ListTileNativeAdFactory class.
(I used this ...
- 195
0
votes
1
answer
593
views
Programmatic NSScrollView with layout anchors - how to fix the scrolling?
Quite a few SO posts on implementing a scroll view programmatically but I haven't found a solution for this case... here I am adding subviews to the document view (with everything laid out using ...
- 189
0
votes
2
answers
857
views
IOS SafeAreaLayoutGuide anchor for landscape screen
I've been following Paul Hudsons' Hacking with Swift tutorials and I'm up to project 6 where he uses layout constraint programmatically. I've been doing this kind of task solely using Interface ...
0
votes
1
answer
1k
views
Cannot convert value of type 'NSLayoutAnchor<NSLayoutXAxisAnchor>' to expected argument type 'NSLayoutAnchor<AnyObject>
I'm trying to write an extension for UIView to make it easier to set anchors for a view.
The idea was to write a setAnchors method like this:
import UIKit
extension UIView {
func setAnchors(top: ...
- 565
3
votes
1
answer
452
views
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 ...
- 1,910
1
vote
1
answer
1k
views
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) ...
- 10.6k
0
votes
1
answer
1k
views
Is best to call .layoutIfNeeded() before or after constraints are changed
I have a button that changes sizes depending on certain situations. I don't need an animation done because the user never sees the change occur. Sometimes when switching back from a smaller size to a ...
- 19.5k
1
vote
2
answers
3k
views
How to animate UIView using constraint from bottom to top?
I am creating UIView programmatically and after that i will animate that view from bottom to top using constraints. But animations doesnot show on this view object.
overlay!.addSubview(...
- 17
3
votes
1
answer
7k
views
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 ...
- 707
2
votes
0
answers
280
views
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 ...
- 5,886
2
votes
3
answers
7k
views
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....
- 59
0
votes
1
answer
77
views
Structure of the cell is destroyed after UIView.transition
In one of my controllers I'm using UICollectionView with two-sided cells (there is a button on the face side of the cell, and if user is tapping it cell should show him/her the other side of the cell)....
- 1,302
0
votes
3
answers
126
views
ios using constraints to hide a view
Why is it that if I have a simple viewcontroller with a button, a "control view" and a tableview below it, I can't get the logic to work that will expand the tableview to cover the "view" when the ...
- 1,364
2
votes
3
answers
2k
views
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 ...
- 364
0
votes
1
answer
138
views
Type of NSLayoutAnchor
No matter what I try I can't get the variations of this to work... What am I not getting?
func anchorType(for string:String) -> NSLayoutAnchor<AnyObject> {
switch string {
case "x":
...
- 2,620
3
votes
0
answers
186
views
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 ...
- 2,620
-2
votes
1
answer
2k
views
How to convert heightAncor to CGFloat Type?
After changing the height of a UITextField using an animation, the Gradient Layer's height that is a subview doesn't match the parent height anynore.
I want to convert heightAncor of a view which is ...
- 416
1
vote
1
answer
2k
views
Removing the blank spaces on left and right side of the UISearchBar
I am creating a UI component that should display a UILabel and a UISearchBar below.
However, I am not able to align them, the UISearchBar always has extra space on both left and right side (...
- 8,024
0
votes
1
answer
842
views
Setting subviews layout anchors to UIScrollView
When i want to set top anchors of my subviews in a UIScrollView, i have to give them a constant height, otherwise scrollView won't scroll. But As they grow in number, it feels like a mess.
For ...
- 301
1
vote
0
answers
478
views
Cocoa Autolayout issue - NSTextView inside a custom NSView
I'm currently writing a Cocoa app, in Swift to exercise the language. I'm not too familiar with the AppKit framework yet, but now I bumped into an interesting problem.
It simply contains an NSWindow,...
- 13
0
votes
2
answers
369
views
Update widthAnchor on Device orientation
I have this constraint in my controller for a view like this:
someView.widthAnchor.constraint(equalToConstant: view.bounds.width).isActive = true
Now I've added this constraint in willLayoutSubviews ...
- 195
5
votes
1
answer
6k
views
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 ...
- 358
4
votes
0
answers
9k
views
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 ...
- 65
1
vote
0
answers
159
views
UITabBar change view hierarchy after rotating process. (or changes its position in view hierarchy)
I have a view with several subviews (with only one peculiarity I added tabBar as a subview to a view of VC)
super.viewDidLoad()
view.addSubview((tabBarController?.tabBar)!)
view.addSubview(...
- 358
0
votes
1
answer
1k
views
Weird layout with tabBar.topAnchor
I have several subviews
view.addSubview(collectionView)
view.addSubview(pageControl)
view.addSubview((tabBarController?.tabBar)!)
view.addSubview(skipButton)
view.addSubview(...
- 358
0
votes
1
answer
616
views
How can I 'add' two NSLayoutDimensions?
Adding two NSLayoutDimension objects doesn't really make sense, but I'm trying to set the height of a container view to the height of two subviews with dynamic heights.
Here's a visual representation ...
- 142
0
votes
2
answers
347
views
How do I update a constraint from the Storyboard without an IBOutlet or Identifier?
I have a lot of views that are created in the storyboard, but I want them to be able to update their constraints dynamically without having to use an IBOutlet each time.
I started by making a custom ...
- 23
1
vote
1
answer
61
views
NSLayoutConstraint:Adding line between the views
I am facing the NSLayoutConstraint issue. I created a view programmatically and wanted to add the line between two view.Line is created but it is added inside the view as shown in figure:
How can i ...
- 191
2
votes
1
answer
216
views
Console warning when using NSLayoutAnchor.constraintEqualToSystemSpacingAfter
I am using NSLayoutAnchor's constraintEqualToSystemSpacingAfter for building my layout.
NSLayoutConstraint.activate([
customView.leadingAnchor.constraintEqualToSystemSpacingAfter(...
- 57.9k
1
vote
2
answers
582
views
Translating constraints in a visual format to NSLayoutAnchor APIs
I have the following extension that I got from this SO question a few months ago, and I'd like to translate this to NSLayoutAnchor (or the more verbose layout APIs) due to the simple reason that the ...
- 12.2k
3
votes
2
answers
12k
views
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 ...
- 1,375
0
votes
1
answer
2k
views
Using NSLayoutAnchor to create constraints between two labels?
I'm creating a view programmatically and need to set constraints between two labels. I recently just discovered NSLayoutAnchor and feel it would be a good choice to use it but I'm unsure how to create ...
- 5,421
1
vote
2
answers
4k
views
How can a `NSLayoutYAxisAnchor` be used as variable?
How can a variable of type NSLayoutYAxisAnchor be defined?
The following doesnt work, but hopefully illustrates what I mean:
let anAnchor: NSLayoutYAxisAnchor = .topAnchor
NSLayoutConstraints....
- 15k
2
votes
3
answers
6k
views
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,...
- 3,236
2
votes
2
answers
786
views
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 ...
- 5,210
3
votes
2
answers
12k
views
"Cannot convert value of type 'NSLayoutDimension' to expected argument type NSLayoutAnchor<NSLayoutXAxisAnchor>
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....
- 4,580
1
vote
1
answer
855
views
changing layout anchors of view on an action
I have one upperLabel, one view and button.
In ViewDidLoad() method I have given some layout constraints to a view. On tap of the button I need to update those constraints(i.e the view should move ...
- 11
1
vote
1
answer
4k
views
How to set the NSLayoutAnchor to generate an centered subview with aspect ratio 1:1
It doesn't sound too difficult, but after hours of trying I couldn't get a proper solution.
Problem: I want to set constraints (with class NSLayoutAnchor) to get a subview (colorImageView) beeing ...
- 7,870
1
vote
2
answers
4k
views
programmatic constraints - cover entire superview using layout anchors
Is it possible using layout anchors to cover an entire superview's screen?
Using NSLayoutConstraints, I can achieve this effect using the code below
dimmingView = UIView()
dimmingView....
- 762
42
votes
3
answers
14k
views
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 ...
- 421
0
votes
1
answer
912
views
pin UiTableView to (view controller)view with layout anchor
I want to 'pin' a tableview to it's container, the view of a view controller. Since UIView does not have anchor properties, I try to do it with the layoutMarginsGuide.
UIView does not provide ...
- 12.9k