I have created one view, which I want to use for all iPhone dimensions. So I've set constraints in the view's subviews and its working fine. But when I tried to launch the app in a phone with dimensions less than that of the xib I created, the view projects outside the superview when adding as subview. So now each time when I am adding as subview I have to set the view's frame according to the device's screen dimensions.
I want to know whether there is any other way to resize the view's dimensions in accordance with the device's dimensions, other than setting the view's frame manually.
if you are using the the auto layout in your xib then go to
editor menu-->Resolve auto layout issues-->ALL views in view-->update constraints. if there is no constraints applied then you can go for add missing constraints and see the difference.
I just started using AutoLayout more thoroughly, and I encountered a big problem:
I have a view with some subviews attached to its top and some subviews attached to its bottom, so when the view is changed in height the subviews are moved accordingly. Depending on user actions the height of the subviews can change (= their height constraint values change), and this can lead to a situation where they don't fit in their parent view anymore.
How can I find out whether a new set of constraints will make it necessary to change the parent view's height in order to accommodate all of its subviews? Preferably before I display all fields with the new constraints - I'd like the view's height to change at the same time. Reason for this: I animate the change of constraint values, and I'd like to animate the view height change at the same time. Already performing the new constraints by calling layoutIfNeeded is out of the question because of this.
The question is not clear enough, but couldn't you just get the height of each subview and compare the summary value with parent view's height?
I have one UIView and inside that, N UILabels which are laid out relative to each other.
The containing UIView has a background color, I want to extend the UIView to be high enough to cover all labels inside it, so the background color is behind them all.
(I'm embedding them in a UIView so I can have the labels inset from the view edges.)
Is there away to make the UIView's height expand to fill its content? I can't figure it from the constraint options, it seems like its all relative to superviews.
Normally I'd just work out the frame sizes programatically in viewDidAppear but those are getting reset by the constraints system, AFAIK.
I think I actually worked it out though.
I had the labels height set manually from when I drag-dropped and resized it. Deleting the height constraint on the UILabel made it size to fit content, which causes its superview to resize too. At least I think that's the case, I'm new to constraints.
Will leave the question up since it will probably bite someone else too.
While I've used UIScrollView successfully in the past by manipulating it programmatically, I'm having trouble getting it to work by setting it up exclusively in Interface Builder.
I have a simple "about" page in my iPhone app. It has a UITextView, some icons, and links to my other apps. I have added all of these views to my UIScrollView, arranging them so that their total size is > 480. When I launch my app, the scrollview displays only the contents that fit on the screen, and nothing scrolls.
Is it possible to do this entirely via IB, or must I manipulate the contentSize via code?
You forgot to set the contentSize property of the UIScrollView. Strangely enough you can not do this from Interface Builder. You will have to do it from the view controller managing this scroll view.
Boby_Wan's answer got me thinking, and I found the following solution to configure the UIScrollView's contentSize from Interface Builder:
Select the UIScrollView in the Storyboard scene
Go to the Identity inspector, create a new User Defined Runtime Attribute (click the + button)
Change the attribute Key Path to contentSize
Change the attribute Type to Size
Now set the Value to {desired content width, desired content height}
eg setting the value to {320, 920} will let the user scroll down a whole extra screen on the iPhone.
(I am using xcode 4.3.3, the project's iOS Deployment Target is 5.1)
When I first did this I received the following error:
Illegal Configuration:
Size type user defined runtime attributes with Xcode versions prior to 4.3
MainStoryboard.storyboard
If you too get this error it is simple to fix: select the Storyboard in the Project Navigator, and bring up the File inspector. Find/expand the Interface Builder Document section, and there is a drop down for Development. Ensure this is set to Xcode 4.3
With Autolayout (iOS6+), you can avoid setting contentSize. Set the following constraints instead:
Pin the top of the scrollview to the top of its top-most child.
And pin the bottom to the bottom of its bottom-most child.
You can do it using only Interface Builder, go to the Identity Inspector (the third inspector tab) and add a new User Defined Runtime attribute with
Key Path: contentSize
Type: Size
Value: {width, height}
Now there is a way to make a UIScrollView scroll without leaving Storyboard:
Select the UIScrollView in the Storyboard, go to the Size
inspector and change the Bottom value (or whatever other value
you need to change) in the Content Insets section to the height of the content area.
Now go to the Identity inspector and create a new User Defined Runtime Attribute (by clicking the + button) and name it contentSize. It doesn't matter what Type or Value you fill in (you can even leave their default value).
This will make the UIScrollView work properly, although I don't know why the second step is necessary (I found out by chance). :(
one approach i have used in the past is to drag the scrollview out of it's containing view in interface builder, and set it's actual size to what want the contentSize to be.
what is not inherently obvious about interface builder is you can have unassociated views that are stored in the nib, but aren't a part of the main view the nib is primarily for.
in the view where you want it the scrollview to live, place a simple UIView, which you use as a place holder. (this is simply so you can visually design it's location. if you are just using the entire view, you can skip this step and use the second code snippet i supply at the end of this answer).
you can then populate the scrollview with controls, visually laying it out how you want it to be. give both the placeholder and the scrollview properties inside your view controller so you an access them at runtime.
at runtime, in - (void)viewDidLoad
scrollView.contentSize = scrollView.frame.size;
scrollView.frame = placeholder.frame;
[placeholder.superview addSubView:scrollView];
[placeholder removeFromSuperview];
alternatively (if you didn't use a placeholder):
CGRect f = self.view.frame;
scrollView.contentSize = f.size;
f.origin.x = 0;
f.origin.y = 0;
scrollView.frame = f;
[self.view addSubView:scrollView];
finally, if you "lose" your scroll view in interface builder (it's possible to close it so it disappears from the design grid), don't panic. just click on it in the object list to the left of the design grid.
In Xcode 4.5 using Autolayout I have no Content Insets section in my size inspector. So I had to add it under User Defined Runtime Attributes and then it worked fine.
What you add in "User Defined Runtime Attributes" is keyPath == contentInset which is of type "Rect" (UIEdgeInsets, which has the same input as a Rect) and is defined as {top, left},{bottom, right}. The contentSize only defines the region of the scrollview window. contentInset defines the scrollable area.
I hope this helps somebody in the same situation.
Many of the answers above are misleading or outdated. As of 2017 (possibly much earlier) interface builder does support scrollviews with automatically sized content. The trick is that XCode gives a special, non-standard meaning to the constraints between the scrollview and the content inside it. These "inward" constraints will not actually affect the size of the content as you might otherwise expect.
This means that you can e.g. have your scrollview pinned to the bottom of the main view with zero margin, and also have your scrollview's content pinned to the bottom of the scrollview with zero margin, but the content will not actually be stretched by this. Instead the content will get its self-determined size (more below) and this will also be the size of the scrollable area within the scrollview.
Think of it like this - There is an asymmetry in binding constraints to a scrollview: Constraints from the scrollview to the "outside" (parent) world determine the size and position of the scrollview as usual. But constraints "inside" the scrollview are really setting the size and position of the scrollable area of the scrollview, by binding it to the content.
This is totally non-obvious because when you go to set the constraints XCode will always suggest the current spacing and it might never occur to you to intentionally change the inward and outward facing constraints in a way that conflicts. But you can and they have the meaning described above: one controls the scrollview layout and one controls the scrollable content area size.
I stumbled upon this by accident and then seeing how it appeared to work lead me to this article that explains it completely and cites the Apple docs source for this:
https://spin.atomicobject.com/2014/03/05/uiscrollview-autolayout-ios/
One last critical piece of information, about the content's self-determined size: You may feel that you are in a catch-22 here because you normally size your content to e.g. the parent view's width, but in this case the parent is the scrollview and as described above - the constraint will not affect your content size. The answer here is to remember that you can constrain items to items not directly neighboring in your view hierarchy: e.g. You can set the width of your content view to the width of the main view instead of trying in vain to get the scrollview to do it for you.
If you click on the Properties icon of any View Controller in Interface Builder, you can set it to a "Freeform" size in Simulated Metrics and change the size of the main View to be your desired content size.
This way you can create your ScrollView's content as if it were one large view. As it's only a simulated metric your View Controller will be resized to the window's bounds when it's loaded.
Setting up a UIScrollView via Interface Builder is not intuitive. Here is my checklist for setting it up:
Select the UIViewController's XIB file. In the interface builder's "Identity Inspector", change the UIView to class type UIScrollView
Under "File Inspector", uncheck Autolayout
Under "Attributes Inspector", change the size to Freeform. You can then stretch the Scroll View manually or you can specify a custom width and height under "Size Inspector".
In "Identity Inspector", add a new User Defined Runtime Attribute called "contentSize" of type "Size" and change it to a value like {320, 1000}. You cannot set this programmatically anymore and therefore need this step so that Scroll View knows that contents of the Scroll View are bigger than the window.
Just remove the autoLayout on your scrollview. then the code is as simple as this:
scrollviewName.contentSize = CGSizeMake(0, 650);
just create an iboulet property on .h file then synthesize on .m file. Make sure that the scrolling is enabled.
Yes, st3fan is right, UIScrollView's contentSize property must be set.
But you should not turn off autolayout for this purpose.
You easily can setup contentSize of UIScrollView with autolayout in IB only, without any code.
It is important to understand that when using autolayout contentSize of UIScrollView is not set directly, it is calculated based on constraints of all subviews of UIScrollView. And all you need is to provide proper constraints for subviews for both directions.
E.g. if you have only one subview you can set its height and space from top and bottom to superview (i.e. scrollView in our case) contentSize.height is calculated as sum
Vertical Space (aSubview.top to Superview.top) + aSubview.height + Vertical Space (aSubview.top to Superview.top)
contentSize.width is calculated similarly from horizontal constraints.
If there too few constraints to calculate contentSize properly small red button is shown near View Controller Scene item to inform about layout ambiguity.
If there are many subviews then it may be "chain" of constraints: top to topmost subview, heights and spaces between subviews and bottommost subview to bottom like in Danyal Aytekin answer.
But in practice in most cases it is more convenient just to add a empty view with required size and set spaces to top, left, bottom, right of scrollView to 0.
You can use this view as "content View" i.e. put all other subviews on it or if you already have many subviews and do not want move them and setup layout again you can add this auxiliary view to existing subviews and made it hidden.
To make scrollView scrollable calculated contentSize must be greater than scrollView size.
You can have UIScrollView in StoryBoard with Autolayouts.
Basically what do you need is:
Add UIScrollView
Add all constraints to it (like insets from top, left, right, bottom edges)
Add a 'container' UIView to UIScrollView
If you want just one-direction scroll (say, vertical):
set height explicitly (for the instance, 600) and link width to the width of UIScrollView.
If you want two-directional scroll just set both width and height.
Here's a solution to design ScrollView with a content larger than the screen entirely in Storyboard (well, almost entirely, you'll need to add 1 single line of code too)
https://stackoverflow.com/a/19476991/1869369
I find out a more convenient way.
1: Scale the size of the scroll view to contain all the ui inside it.
2: Add a iboutlet of the scroll view.
3: In viewDidLoad, save the frame.size of the scroll view.
(e.g. _scrollSize = _scrollView.frame.size;)
4: In viewWillAppear, set the contentSize by the CGSize you saved before.
(e.g. _scrollView.contentSize = _scrollSize;)
5: Done~
Add UIViewController
In UIViewController 'Attribute Inspector -> Simulated Metrics' set size Freeform
In UIViewController 'Size Inspector -> View Controller' set height 800
Add UIScrollView in UIViewController
Add all constraints to UIScrollView (top, left, right, bottom) and add alignment X = center
Add UIView in UIScrollView
Add all constraints to UIView (top, left, right, bottom) and add alignment X = center. Yes, same as for UIScrollView in #3, but for UIView
Add height constraint to UIView. For example 780
Run
Create a new Xcode Project
Navigate to Main.storyboard file
Select ScrollView from the objects library.
Set frame for the ScrollView.
Add another view to scroll view and keep the frame same as that of ScrollView.
Now to set its height and width dynamically you may this Configure A UIScrollView Using Auto Layout In XIB
You can do it entirely in Interface Builder without setting the "contentSize" property in code.
Put only one View in Scroll View. The Scroll View should only has this child view. You can name it as Content View. And put all contents inside this View later.
Align four edges of this View to the Scroll View (the View's superview) with zeros.
Set the width and height of this View. The width and the height will be implicitly treated as the "contentSize" of the Scroll View.
Simply put, the width and height of this View define the "contentSize" of the Scroll View. Because this View is the only content of the Scroll View, the size of this View is the content size of the Scroll View. It is quite reasonable.
I learned it from this tutorial:
https://riptutorial.com/ios/example/12812/scrolling-content-with-auto-layout-enabled