I have a UICollectionView with size: 768x1024 with a navbar on top. My custom UICollectionViewCells are of size 200x200. The problem is that when I keep adding cells and I reach the bottom row, I can only see part of the 200x200 cell. It won't let me scroll further before it bounces back up. Any ideas on what the problem could be?
EDIT:
I add cells via:
insertItemsAtIndexPaths:
The issue was just adding AutoLayout constraints to the View Controller which housed the UICollectionView. To do this, select the View Controller in Storyboards and click on "Editor" on the top. Then, "Resolve Autolayout Issues" > "Reset to Suggested Constraints..."
Check whether you have changed the minimum spacing attribute of collection view in size inspector of collection view. Setting it back to default values(10) was the solution for me.
The problem has to do with your UICollectionViewLayout, since it is the job of the layout to state how large the actual scrollable content is, and to ask for a refresh of that information when necessary. But unfortunately your question reveals nothing about how you are doing layout or how you "keep adding cells", so no specific answer is possible.
EDIT (after your edit): It is not enough to call insertItemsAtIndexPaths:; you must also add the items to your model (the data source). Otherwise, the layout doesn't know about them and doesn't make the scrollable content bigger (and lots of other bad things happen too).
i think you use the collection view in an unsual way, but if the content area of the scrollview of the collection view extend the frame size of the collection view you have to set the virtual size with the property 'contentSize' :
self.collectionView.contentSize = CGSizeMake(768,900);
I had a similar problem but due a gradient that it was at the bottom of the collection view and the user was not able to see the last rows of the collection view.
The way I've found to solve it is in the Size Inspector, set the Height of the Footer Size to a number that works for issue.
I know that maybe, it's not the best solution. But it works for my problem and it's really easy to use it.
Collection View that doesn't show the last row:
Collection View after setting the Footer Size Height to 40:
Related
I have some modal controllers that are UIViews and are not scrolling.
Reading on SO, the apple docs and elsewhere, it seems there are three approaches to fixing this:
Multiselect all the elements within the view and then go
editor-embedin-UIScrollview.
change the view to a scrollview in the identity inspector and then
add the following line to viewdidload:
[(UIScrollView *)self.view setContentSize:CGSizeMake(320, 2000)];
Copy elements to clipboard, delete the uiview, add a new scrollview
and copy the elements into the scrollview. Warning - this destroys
the positioning of the elements although it does preserve their
outlet properties.
However, I have tried all of these and the scrollview still does not scroll.
Is there any other step I am missing?
Thanks in advance for any suggestions.
Edit:
Getting scrollviews to work is not easy and there is much conflicting advice on the web.
I finally got this to work by setting the content size in a separate method as opposed to viewdidload.
(void)viewDidLayoutSubviews {
self.MainScroll.contentSize = CGSizeMake(320, 1800);
}
Thanks as well to Evo for advice on setting all the vertical dimensions correctly and using freeform in the VC size inspector as it won't work if you don't carefully set these.
If you have EVER enabled autolayout, even if it's disabled now, you need to:
Select the view controller you plan on scrolling
At the bottom right of the storyboard view, click the third button (far right) and then "Reset to Suggested Constraints"
Make sure that all the elements in the scrollview are embedded in the desired positions.
If you are not using autolayout:
Check that the Size of the view controller is set to (320, 2000), or whatever you want.
In the Simulated Metrics of the view controller, you can set the size type to Freeform.
Then in the tab to the right of Simulated Metrics, you can set the width and height to the desired values.
Please comment any concerns
I would like to insert a UITableView into a UIScrollView.
To do this I added a ContainerView inside the UIScrollView and a UITableView linked to this ContainerView.
The result obtained in the storyboard is this :
http://i.stack.imgur.com/12hZz.jpg (Storyboard)
http://i.stack.imgur.com/AGY4L.jpg (Storyboard)
When I launch the emulator the TableView is loaded correctly, but not with the result expected
http://i.stack.imgur.com/ebij9.gif (Animated GIF)
http://i.stack.imgur.com/bEO8B.jpg (Wrong result)
But instead what I wanted to to obtain is this:
http://i.stack.imgur.com/R7Zhb.jpg
Is it possible?
Could you tell me if the way to proceed is correct?
Thanks!!
I have not enough reputation to post images and more than two links.
Sorry for my poor english.
So what you have is close, but you need to set the size of the container view to the content size of the table view once it has loaded its data. Your other views around the content view then need to respond to the change in size so you don't get overlaps.
If you know the height of each row in the table and how many there are then it's easiest to calculate the hight required and set that as the size of the content view. If you don't, or the height can change based on user choices or something like that, then you will need to do something more complicated which observes the content size of the table view and updates things when it changes.
I have this UICollectionView, layout scroll direction = horizontal.
I don't want it to occupy all page (as it does when you create it in IB), I need to have a header (another view) above it. This won't work using Accessories -> Header Section, when the scrolling is horizontal this header section sits to the left of the collection view. And it's not fixed, as I need my view to be.
Thanks
I was doing something similar and ended up just putting a UIView at the top that allowed me to put whatever I needed up there. It just solved a lot of problems for me.
I thought it was strange the way the header operates in the horizontal scrolling mode. It isn't really a header at all.
Revision -- I don't use IB at all, so it is all hand-coded -- but either way, you can do it. I've attached a screenshot of something I'm working on now -- it has a picker view and a youtube video at the top, where your header would be and a collection view down below. You could, of course, make your header view whatever size you want it to be and with whatever content. In this case I also have a footer that is a different view as well, but the concept is the same.
I am quite new to xcode.
I am trying to create a contact details form for an iPhone using the storyboard. The problem is that form is longer than the display and I can't work out how to design it using the storyboard.
Any ideas?
Tom
In IB, you can set the controller's size in Simulated Metrics to Freeform, then select the view and make it as tall as you want. Then, add a scroll view to take up the whole view, and add your UIElements, and lay them out how you want. When you run the app, the view controller will still only be as big as the screen (obviously), but the scroll view will be as big as you made the view in IB (you may need to increase its contentSize even more to be able to scroll to the bottom).
Such forms are often made in storyboards using a UITableView and setting the "content" of the table to be "Static Cells." You can set any number of cells and the contents of the cell you want. The table itself is scrollable inside the storyboard/Interface Builder editor and looks much the way it would when presented to a user.
First, select the tableView on the left
Then, you can move it simply scrolling (on mac, two fingers on the trackpad, or using the mouse wheel)
You should have a look at UIScrollView, it is designed to support content larger than screen size (like you see in web browser or settings)
Basic usage is:
//Set a size which will be able to cover all form elements
[yourScrollView setContentSize:CGSizeMake()];
//Your scrollView now extends from CGPoint 0,0 to contentSize.width,contentSize.height.
//Your subviews should be positioned according to scrollview's bounds not the viewcontroller.view or any other container view.
//Add all the form elements
[yourScrollView addSubview:...];
[yourScrollView setDelegate:self]; //If you need actions after user scrolled etc.
Have a look at the developer manual for more info. Most method names are quite self explanatory.
http://developer.apple.com/library/ios/#documentation/uikit/reference/UIScrollView_Class/Reference/UIScrollView.html
I have a vertically scrolling uiscrollview - imagine an 'about this app' page of a tab bar app which goes on a bit and requires a scrollview. It only contains a few images, a video and some text (only the video has been coded in - the rest have been placed in the GUI). In storyboard (Interface Builder?) Xcode 4.2, everything is set up as it should be and works fine, but the view is only as large as what you see on the screen, is it not possible to manually arrange in storyboard the items that are initially offscreen - that you need to scroll up to? The only way I've found so far is to design them on the visible view then navigate them down with the arrow keys..
In the storyboard select the viewController, then in Attributes inspector change 'size' to 'freeform'. Then change the 'height' of the view/scroll view to as big as you need. The default settings of struts and springs should take care of resizing the view back correctly when the app is run, but you should double check.
I feel your pain. The only way I found is to manually pan the scroll view in the size inspector to reveal the portion of the view that you wish to visually edit.
Use a UIView to contain elements so they are positioned relatively to this view. Add the view as a subview to the scrollview at 0,0.
pan: use the Y coordinate say to -200, then edit the contents.
to place more contents in the hidden part, pan again to reveal new real-estate
when finished, restore the values of the ScrollView's height and X,Y position.
Make sure the scroll view frame rectangle is smaller than the contained view.
New: 3/26/2013
I stumbled upon what I think is even simpler way of dealing with UIScrollView directly in storyboard.
No code needed, just storyboard settings. This maybe new in iOS6.1 / Xcode 4.6
No need to disable constraints (i.e. uncheck "Use autolayout" in File Inspector for storyboard file)
No need to add UIScrollView* scrollView; in .h
No need to add self.scrollView.contentSize = ... in overrides of viewWillAppear or viewDidLoad
Here is what I did (important parts highlighted with **): (see code)
Create a new project with storyboard enabled
Drop in a UIScrollView, set class in identity inspector for view controller
In attributes Inspector, change Size under simulated metrics to Freeform**
Select scroll View; In attributes inspector, turn on "scroll enabled" and "background" to "White" (you'll figure out why - if you don't)
Under Size Inspector (with scroll view selected) change the height to 900 for example**
Add buttons, one on top and one at the bottom
Add a default handler for buttonTouchUpInside for both buttons and simply Log sender.
See Code Select the View Controller and scroll view and check inspectors.
Just change the 'Simulated Size' of the view controller to freeform and set a height that is larger than the usual size, you will be able to see all the outlets you need to edit.
On iOS 6.0 you can drag a Container View inside your Scroll View. This will automatically create a new View for your content, outside of the current scene. You can then resize this view as big as needed to fit your content.
I believe you would still have to set the ScrollView content height at runtime, but at least you can design you content view at once without having to scroll up and down on IB.
Just uncheck the "Autoresize subviews" from any view that you're trying to resize and it should keep all your objects from resizing with it.
I've been struggling with this for a while now, and every single thing I've tried has failed.
Specifically, What I am trying to achieve is a freeform sized modal dialog with a scrollable view containing a container for another view. I have had a lot of varied results, including occasionally having it working correctly. Most often I get it looking exactly correct, but with no scrolling.
In finally downloaded Dickey Singh's code, which worked perfectly but had nothing special. (Excellent clean solution BTW). So, I added a container view to it, exactly as I had in my code, and it broke!
After some experimenting, I worked out what is going on. Just bear with me.
1) Using Auto Layout, the size of the scroll view seems to dictate what the scrolling bounds will be. Setting "contentSize" in "USer Defined Runtime Attributes" seems to have no effect on this, and neither does setting "contentSize" or "bounds" in "viewWillDisplay" or "viewDidLoad". Thus if the initial size of the scroll view is 800x800, that will be all the space that can be displayed. For this reason, when I want a scrollable region, I create a container view and then put the scrolling view inside the content.
2) Without Auto Layout, setting "contentSize" in "User Defined Runtime Attributes" works, as does by setting it programmatically in "viewDidLoad". I prefer to use "User Defined Runtime Attributes" because it keeps the size with the layout. This solution allows you to use scrolling view with more flexibility, since it can be any size at design time.
3) Regardless of Auto Layout, if any view within the scrolling region exactly matches EITHER the horizontal or vertical frame bounds, then the scroll view ceases to function as a scroll view. This applies to my own code and to Dickey Singh's code in every possible configuration that I have tried.
I have no idea what is causing (3), but it is clearly a bug.
I hope this helps everybody out there who is struggling to use scroll view. I imagine that some people are using them without any problem, and some (like me) have had noting but problems with them.
Here's my solution to design a ScrollView with a content larger than the screen entirely in Storyboard (well, except for 1 single line of code :-) :
https://stackoverflow.com/a/19476991/1869369
I'm currently developing an app for iOS 7, and I did exactly as #Dickey Singh's answer, but it doesn't work in the beginning.
After checking the storyboard, I found that we also need to add Auto Layout Constraints for the view controller who holds the scrollView.
It seems that such auto layout constraints would be added automatically before Xcode 5, but now we need to do it ourselves.
The way to add constraints: First select the view controller in the storyboard; Enter 'Editor' in the top menu; Select the 'Resolve Auto Layout Issues'; Select the 'Add Missing Constraints In Container'. Done :-)