Questions tagged [autolayout]
Auto Layout is a constraint-based, descriptive user interface layout system for OS X and iOS.
autolayout
12,109
questions
1614
votes
29
answers
708k
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Using Auto Layout in UITableView for dynamic cell layouts & variable row heights
How do you use Auto Layout within UITableViewCells in a table view to let each cell's content and subviews determine the row height (itself/automatically), while maintaining smooth scrolling ...
- 30.4k
1049
votes
12
answers
338k
views
How do I animate constraint changes?
I'm updating an old app with an AdBannerView and when there is no ad, it slides off screen. When there is an ad it slides on the screen. Basic stuff.
Old style, I set the frame in an animation block.
...
- 23.1k
721
votes
10
answers
262k
views
Cocoa Autolayout: content hugging vs content compression resistance priority
I can't find a clear answer on Apple documentation regarding Cocoa Autolayout about the difference between content hugging and compression resistance.
Can somebody explain their usages and ...
- 9,042
625
votes
35
answers
366k
views
UIScrollView Scrollable Content Size Ambiguity
Fellow devs,
I am having trouble with AutoLayout in Interface Builder (Xcode 5 / iOS 7).
It's very basic and important so I think everyone should know how this properly works. If this is a bug in ...
- 6,773
568
votes
19
answers
692k
views
How to add constraints programmatically using Swift
I'm trying to figure this out since last week without going any step further. Ok, so I need to apply some constraints programmatically in Swift to a UIView using this code:
var new_view:UIView! = ...
- 6,251
565
votes
41
answers
431k
views
How do I size a UITextView to its content?
Is there a good way to adjust the size of a UITextView to conform to its content? Say for instance I have a UITextView that contains one line of text:
"Hello world"
I then add another line of text:
...
- 10.1k
410
votes
4
answers
433k
views
How to get StackPanel's children to fill maximum space downward?
I simply want flowing text on the left, and a help box on the right.
The help box should extend all the way to the bottom.
If you take out the outer StackPanel below it works great.
But for reasons ...
- 191k
367
votes
24
answers
214k
views
How to use Auto Layout to move other views when a view is hidden?
I have designed my custom Cell in IB, subclassed it and connected my outlets to my custom class. I have three subviews in cell content which are: UIView (cdView) and two labels (titleLabel and ...
- 4,357
343
votes
8
answers
96k
views
Emulating aspect-fit behaviour using AutoLayout constraints in Xcode 6
I want to use AutoLayout to size and layout a view in a manner that is reminiscent of UIImageView's aspect-fit content mode.
I have a subview inside a container view in Interface Builder. The subview ...
- 5,188
322
votes
10
answers
101k
views
Automatic Preferred Max Layout Width is not available on iOS versions prior to 8.0
I opened an existing iOS project with Xcode6 beta6, and Xcode lists the following warning for both Storyboard and Xib files:
Automatic Preferred Max Layout Width is not available on iOS versions
...
- 4,341
320
votes
21
answers
162k
views
Getting a "This application is modifying the autolayout engine from a background thread" error?
Been encountering this error a lot in my OS X using swift:
"This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. ...
- 12.4k
311
votes
23
answers
116k
views
What is NSLayoutConstraint "UIView-Encapsulated-Layout-Height" and how should I go about forcing it to recalculate cleanly?
I have a UITableView running under iOS 8 and I'm using automatic cell heights from constraints in a storyboard.
One of my cells contains a single UITextView and I need it to contract and expand based ...
- 17.2k
298
votes
6
answers
149k
views
How to trap on UIViewAlertForUnsatisfiableConstraints?
I'm seeing an error appear in my debugger log:
Will attempt to recover by breaking constraint
<NSLayoutConstraint:0x191f0920 H:[MPKnockoutButton:0x17a876b0]-(34)-[MPDetailSlider:0x17a8bc50](LTR)&...
- 9,196
293
votes
8
answers
198k
views
When is layoutSubviews called?
I have a custom view that's not getting layoutSubview messages during animation.
I have a view that fills the screen. It has a custom subview at the bottom of the screen that correctly resizes in ...
- 4,609
288
votes
29
answers
144k
views
Evenly space multiple views within a container view
Auto Layout is making my life difficult. In theory, it was going to be really useful when I switched, but I seem to fight it all of the time.
I've made a demo project to try to find help. Does anyone ...
- 3,097
281
votes
20
answers
174k
views
Is it possible for UIStackView to scroll?
Let's say I have added more views in UIStackView which can be displayed, how I can make the UIStackView scroll?
- 24.8k
258
votes
3
answers
95k
views
What is "Constrain to margin" in Storyboard in Xcode 6
I am Working with autolayout and constraints and found there is a Constrain to margins option in Xcode 6 which was not present in Xcode 5 and is checked by default.
I created a test project then I ...
- 16.3k
252
votes
3
answers
106k
views
setNeedsLayout vs. setNeedsUpdateConstraints and layoutIfNeeded vs updateConstraintsIfNeeded
I know that the auto layout chain consists in basically 3 different process.
updating constraints
layout views (here is where we get calculation of frames)
display
What's is not totally clear to me ...
- 26.3k
237
votes
18
answers
334k
views
UICollectionView Self Sizing Cells with Auto Layout
I'm trying to get self sizing UICollectionViewCells working with Auto Layout, but I can't seem to get the cells to size themselves to the content. I'm having trouble understanding how the cell's size ...
- 2,956
230
votes
11
answers
85k
views
Autolayout - intrinsic size of UIButton does not include title insets
If I have a UIButton arranged using autolayout, its size adjusts nicely to fit its content.
If I set an image as button.image, the instrinsic size again seems to account for this.
However, if I ...
- 26.3k
206
votes
4
answers
57k
views
Are NSLayoutConstraints animatable? [duplicate]
I am trying to animate up some views so that they are blocked by the giant keyboard in landscape. It works well if I simply animate the frames, but others have suggested that this is counter-...
- 33.3k
195
votes
21
answers
147k
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UICollectionView, full width cells, allow autolayout dynamic height?
Historic question.
Note that Apple now have UICollectionViewCompositionalLayout, which is trivial to use.
(Essentially just set fractionalWidth to 1.)
All previous apple systems for sizing collection ...
- 17.9k
191
votes
8
answers
129k
views
iOS: Multi-line UILabel in Auto Layout
I'm having trouble trying to achieve some very basic layout behavior with Auto Layout. My view controller looks like this in IB:
The top label is the title label, I don't know how many lines it will ...
- 4,345
185
votes
17
answers
117k
views
UITextView that expands to text using auto layout
I have a view that is laid out completely using auto layout programmatically. I have a UITextView in the middle of the view with items above and below it. Everything works fine, but I want to be able ...
- 2,232
177
votes
18
answers
91k
views
How can I use Autolayout to set constraints on my UIScrollview?
I have spent two days trying out the various solutions for Mixed and Pure Autolayout approaches to achieve what was a trivial scrollview setup prior to autolayout, and it's now official - I must be ...
- 3,603
170
votes
13
answers
100k
views
AutoLayout with hidden UIViews?
I feel like it's a fairly common paradigm to show/hide UIViews, most often UILabels, depending on business logic. My question is, what is the best way using AutoLayout to respond to hidden views as if ...
- 10.8k
167
votes
12
answers
62k
views
How do I adjust the anchor point of a CALayer, when Auto Layout is being used?
Note: Things have moved on since this question was asked; see here for a good recent overview.
Before auto layout, you could change the anchor point of a view's layer without moving the view by ...
- 119k
166
votes
4
answers
37k
views
NSInvalidUnarchiveOperationException: Could not instantiate class named NSLayoutConstraint
I am very new to this. I followed Apple's tutorial step by step for the iPhone project "HelloWorld". I ran it in the iPhone 5.0 simulator and it crashed:
2012-11-02 14:46:06.782 HelloWorld[9880:...
- 1,661
162
votes
14
answers
89k
views
Centering a view in its superview using Visual Format Language
I just started learning AutoLayout for iOS and had a look at Visual Format Language.
It all works fine except for one thing: I just can't get a view to center within its superview.
Is this possible ...
- 10.8k
160
votes
22
answers
56k
views
reloadData() of UITableView with Dynamic cell heights causes jumpy scrolling
I feel like this might be a common issue and was wondering if there was any common solution to it.
Basically, my UITableView has dynamic cell heights for every cell. If I am not at the top of the ...
- 7,256
159
votes
13
answers
97k
views
UILabel sizeToFit doesn't work with autolayout ios6
How am I supposed to configure programmatically (and in which method) a UILabel whose height depends on its text? I've been trying to set it up using a combination of Storyboard and code, but to no ...
- 3,489
153
votes
6
answers
52k
views
Enabling auto layout in iOS 6 while remaining backwards compatible with iOS 5
What is the best way to take advantage of the new auto layout features of iOS 6 while still providing compability with older devices on earlier versions of iOS?
- 2,063
148
votes
4
answers
112k
views
How to resize superview to fit all subviews with autolayout?
My understanding of autolayout is that it takes the size of superview and base on constrains and intrinsic sizes it calculates positions of subviews.
Is there a way to reverse this process? I want to ...
- 1,505
142
votes
10
answers
229k
views
How to update the constant height constraint of a UIView programmatically?
I have a UIView and I set the constraints using Xcode Interface Builder.
Now I need to update that UIView instance's height constant programmatically.
There is a function that goes like myUIView....
- 4,037
141
votes
6
answers
95k
views
autolayout - make height of view relative to half superview height
have been getting into autolayouts recently and I'm stuck on what seems like a really trivial problem example. I have a view that I want to sit at the top of the screen, and take up half of the screen-...
- 5,555
138
votes
13
answers
105k
views
How to determine height of UICollectionView with FlowLayout
I've got an UICollectionView with an UICollectionViewFlowLayout, and i want to calculate its content size (for return in intrinsicContentSize needed for adjusting its height via AutoLayout).
The ...
- 6,903
132
votes
30
answers
75k
views
UITableView dynamic cell heights only correct after some scrolling
I have a UITableView with a custom UITableViewCell defined in a storyboard using auto layout. The cell has several multiline UILabels.
The UITableView appears to properly calculate cell heights, but ...
- 1,752
131
votes
10
answers
97k
views
Is it possible to obtain a dynamic table view section header height using Auto Layout?
New in iOS 8, you can obtain 100% dynamic table view cells by simply setting the estimated row height, then layout your elements in the cell using Auto Layout. If the content increases in height, the ...
- 54k
131
votes
6
answers
25k
views
What happens with constraints when a view is removed
The question I have is simple but I couldn't find any information in the documentation.
What happens with layout constraints when a view is removed from the view hierarchy (or moved to another view)?
...
- 129k
128
votes
6
answers
84k
views
iOS: How does one animate to new autolayout constraint (height)
I've never worked with autolayout constraints before. I have a small new app I'm working on and noticed that the NIB's views are defaulting to autolayout. So, I figured I'd take the opportunity to ...
- 38.2k
127
votes
18
answers
165k
views
How to adjust height of UICollectionView to be the height of the content size of the UICollectionView?
I would like the UICollectionView (The red one) to shrink to the height of the content size in this case UICollectionViewCells(the yellow ones) because there is a lot of empty space. What I tried is ...
- 1,895
121
votes
3
answers
66k
views
How to create percentage of total width using autolayout?
I need to create three dynamic columns, each with a fixed percentage of the total width. Not thirds, but different values. For example, the following illustration shows three columns: the first ...
- 4,584
120
votes
8
answers
104k
views
When can I activate/deactivate layout constraints?
I've set up multiple sets of constraints in IB, and I'd like to programmatically toggle between them depending on some state. There's a constraintsA outlet collection all of which are marked as ...
- 49k
117
votes
5
answers
119k
views
Use Storyboard to mask UIView and give rounded corners?
Lots of questions like this explain how to programmatically create a mask and provide rounded corners to a UIView.
Is there a way to do it all within Storyboard? Just asking because it seems like ...
- 34.1k
116
votes
5
answers
85k
views
How can I get a view's current width and height when using autolayout constraints?
I'm not talking about the frame property, because from that you can only get the view's size in the xib. I'm talking about when the view is resized because of its constraints (maybe after a rotation, ...
- 3,102
115
votes
5
answers
33k
views
Disable autolayout constraint error messages in debug console output in Xcode
Is there a way to (temporarily) disable autolayout error/warning messages:
Unable to simultaneously satisfy constraints.
Probably at least one of the constraints in the following list is one you ...
- 8,157
115
votes
29
answers
85k
views
Is it possible to use AutoLayout with UITableView's tableHeaderView? [duplicate]
Since I discovered AutoLayout I use it everywhere, now I'm trying to use it with a tableHeaderView.
I made a subclass of UIView added everything (labels etc...) I wanted with their constraints, then ...
- 2,619
115
votes
31
answers
54k
views
"Auto Layout still required after executing -layoutSubviews" with UITableViewCell subclass
Using XCode 4.5 and iOS 6, I'm developing an app with a simple table view with custom cells. I've done this a hundred times in iOS 5 and below, but for some reason the new autoLayout system is giving ...
- 1,259