I have a UIScrollView that contains everything else in my ViewController. I use it because I have logic to scroll up the view when the keyboard shows.
I'm working to make my view compatible with variable screen sizes to accommodate newer iPhones. Currently there are no constraints on anything in the ViewController. If I open the app on a device, it appears in the top left corner.
The first thing I tried was pinning the left/right sides of the UIScrollView to the edges of the container, with left/right distances of 0. When I fired it up on a device, the view had disappeared entirely.
I then tried adding a Horizontal center in container constraint the scrollview (removing the other constraints). Again, just a blank screen - everything had disappeared.
What am I doing wrong? How do I make my scrollview fill the screen, or at least be centered on wider devices?
Is there any way to debug layout issues like this? At the moment, I have no insight into what has happened to the view.
Adding height/width constraints, even though these constraints were overridden to stretch the view to the viewport, fixed this problem.
Related
I need to make something like this
the problem is 6 buttons in the middle, how to make it manually by using scroll view? I need to use scroll view since it will be a problem if in landscape mode
here is what I make
https://drive.google.com/file/d/10TBjW3qAaDEGJ_I_EQBPr5anzGcG1-er/view?usp=sharing
the problem is, in iPhone 5s, it seems it can be scrolled horizontally even though I have set width of content view to be the same as scroll view, and in larger phone, it seems not located centrally and not fill the screen
I don't know what went wrong with the auto layout
I unzip your project, and open the storyboard to check those constraint. You can change device to iPhone SE as the red rectangle marked. I notice that the Width of Content View is fixed with 375. It should be as the same as the width of Scroll View.
After updating the width of Content View constraint, I remove the Width:375 constraint, and apply new one that to equal to the width of Scroll View. It looks like the following image.
Hope those help you.
I am facing a very strange problem. Trying to implement constraints to my view controller makes my button inactive.
My view hierarchy is
UIVIew
UISCrollView
UIView
UIView
UIButton
There are many other views but just for simplicity. One thing is that there is an UIImageView object, which I am stretching to the view according to size but not objects are overlapping or similar, but might be related.
Basically all the constraints are in storyboard. Only for the image view I am using manual setting.
self.imageViewHeight.constant=imgHeight;
when I disable auto layout the button works just fine.
EDIT: Latest observation :Just found out that simulator iPhone 6+ works fine with the constraints. The same is happening with a similar view, which is smaller so all iPhone works just 4S.
So it is definitely issue related to screen size and manipulating with constraints.
Looks like all objects that are bellow screen view itself after creation, so you have to scroll it to see them are inactive.
Any help will be greatly appreciated.
It seems you need to increase the frame Width or Height (whatever you need) of container view. The contentSize of scrollView only affects how it will scroll, which is irrelevant here.
If the button is outside the container view, it will still show up. However, it can't respond to any touch event.
HERE WHAT WE NEED TO DO FOR TOUCH RESPONSE
All you need to do is set bunch of constraints for CONTAINER VIEW of scrollview. Start from adding leading, trailing, bottom, top, width equal and height equal. Now in my case, I need fixed contentSize of Scrollview, so i change priority of equal width constraints to 750. For dynamic contentSize, you need to set priority programmatically.
Comment below if you have any query..
Thanks
I am learning constraints and spent whole day applying them to the following screen.It is not getting displayed properly in landscape mode.Basically i am not getting how to fix vertical space between ,say, label-Welcome to BBBB and textfield-username so that textfield always appears below the label yet the spacing between them is adjusted according to the screens of different size. If i go for Pin\Vertical space, it automatically fixes the constant value.
Remove the label (or just move it out of the way).
Fill the space that you want to resize with a view.
Constrain this view to the objects above and below and to the sides of the parent view.
Put your label into this view and constrain it to the top of this view and centred to it.
You may need to change the constraints on the objects above and below it to stop them from changing height in an unwanted manner.
This new view should now resize as the device changes orientation but the label should remain at the top of it.
Repeat on other areas of your layout (i.e put things that are not moving around as you want them into sub views and constrain these views to resize accordingly). Experiment with using variable heights, fixed heigh constraints and 'equal heights with' constraints on the views that you add to get them to resize as you need.
Edit: but you have a lot of vertically stacked items in that view - you may never get them all to fit into a horizontal orientation. You may need to remove a few, or add a scroll view or force that view only to layout in portrait mode or... Don't forget to check that it works on all devices you are targeting.
#Ali Beadle was right. Since i had a lot of vertically stacked items, lining them up in landscape mode was not possible. So, i went for scrollview.
I have taken a ScrollView first and then a UIView named ContentView on that ScrollView. I have made the width of ContentView equal to the width of parent UIView and kept its height fixed to 568. In my code i set
_contentViewHeight.constant = self.view.frame.size.height;
Now it scrolls in landscape mode while in potrait mode, it does'nt scroll.
I run into Autolayout problems all the time. But I finally figured out a way to overcome a lot of issues that arise from it.
I simply will use a container-View like ScrollView or even a plain old UIView, place all my controls in it. thats it. this makes things a lot easier for autolayout to figure out the constraints. in your case you could just use a UIView.
-start off by removing all the constraints you have I would start by selecting each control in the XIB and see if it has width/height constraint, select it then press the delete key then at the bottom of the project explorer you'll see all the constraints that auto layout has select each one then delete. that should get rid of any complaints that auto-layout might have.
-Place a UIView object inside your main View then
-move all the controls inside it. Then
-add the necessary constraints for the container view so it'll resize in different orientations and don't worry about any constraints inside the container view (auto layout will figure them out automatically).
that does the trick for me usually.
I have been struggling for days with this implementation, and even though I have tried to do every tutorial I found on the web, I still cannot make things work the way I want.
Basically, I am trying to put my login form in a scrollview, so that it takes the whole screen at first (and on all iPhones / iPads), and if the keyboard appears everything should move. The problem IS, my view doesn't take the whole screen... Either it is too large, or too high, even though in Interface Builder everything seams correct (from layout to constraints). Below and image of the layout I want to achieve (I am using an universal storyboard, with Size Classes and Autolayout enabled):
http://img4.hostingpics.net/pics/829115app.png
Can someone point me out on achieving this layout ?
Thanks in advance.
I would suggest pinning top, leading and trailing spaces of your scroll view to its superview. And set a bottom space constraint less or equal to the keyboard's height if you set it to 0, the scroll view won't be able to resize.
With your form layout set vertical center constraints and top space to superview constraints for your top label being more or equal than the distance you set in the IB, and then you can set relative space constraints between each of the components.
Hope I answered your question.
Edit: Just the provided project and got it working. I think the problem is caused by it being a containerView inside a scrollView. And both the container and the scrollViews content view adapt to the size of its subviews. Because of that, setting relative constraints won't help.
What I did was to set an explicit size (screen's size) to the containerView and setting setTranslatesAutoresizingMaskIntoConstraints(true) to it.
I modified your project and uploaded it here
I am having a very frustrating issue. I know there are all kinds of issues with UIScrollView in iOS7 and XCode 5. I need to implement a scrollview and there are all kinds of tutorials showing you how to do it by switching off auto layout but that then messes with the rest of the views in my app.
I tried the fix of putting my subviews into a container UIView and placing that in the UIScrollView and setting the scrollview's content size to the size of the contained UIVIew. That didn't work. Now I am working with placing everything in the scrollview and it all works with one exception. When I load the view on the simulator or a device the content view is moved down but somewhere around 60 points or so. See image below.
That white space below the title bar on the right is still the scroll view as I can press and drag within it. Adjusting the contentOffset doesn't do any good as that just scrolls the view down slightly. I have no idea what to do here.
Just a little more info: I setup the scrollview and all the subviews in storyboard and the connected them up. Not sure if that has any bearing on it.
Thanks in advance for any help you can provide.
I think your Scrollview top space constraint have 64 pixels. That's a problem. So, set your top space constraint value to 0.
You need to add the constraints before view displayed then contentsize will be set automatically.
Check UIScrollView's autoresizing mask. It has to be set like this.