I try to create UIView with auto resizing constraints. The goal is so simple. I need UIView that will transform its size according to device screen. I created three constraints that align to safeArea and one with offset. But when I change Device in a storyboard view, it always appears some gap in the bottom constrain.
In this view, everything is ok. This where I created all constraints
But in all others it's terrible gap.
Does anybody have an adea how to fix that? Unfortunately I don't understand where I did mistake.
Related
So I am using interface builder (which I don't often use), and I have two storyboards, one for iPhone 5+ and one for iPhone 4. The iPhone 5 one works perfectly.
However, when I run the app in an iPhone 4 or 4s, one of the UITextViews shrinks in size like it has deflated. When I use constraints, I usually put the views where I want them then do Editor -> Resolve AutoLayout Views or something, and normally the views snap into place.
Here is what it looks like in IB:
IB constraints
And this is what I get when I run the app:
The UITextView when I run the app
This is probably a really simple mistake, but I do feel like a bit of a doompf with my pancake like UITextView. Does anyone know what constraints I could add/actions I could take in order to make the UITextView the size it is in the storyboard?
I am in Xcode 6 and I am using auto layout.
Thanks in advance,
Edit Solved:
Firstly, I deleted the 3.5 inch storyboard so I only have one storyboard.
Then I selected the view in question, and fiddled around with the different iPhone sizes. Once I had put constraints that look good on all the devices, I ran it on every phone, and it worked :).
I agree with #Minestroni-Soup that you don't necessarily need to use two distinct storyboards. In any case, here's how I'd approach the problem. First, I'll ignore the horizontal direction because your problem happens in the vertical direction. If you have problems with the horizontal direction, post a new question.
Place constraints of fixed heights between vertically adjacent views in your layout, and also between the top view and the top border, and also between the bottom view and the bottom border. Then create a constraint that sets the height of one UITextView to be the same as the height of the other UITextView. That should solve your problem.
top border
constraint to set a vertical space of some amount
label 1
constraint to set a vertical space of some amount
textview 1
constraint to set a vertical space of some amount
label 2
constraint to set a vertical space of some amount
textview 1
constraint to set a vertical space of some amount
bottom border
Note that the above, alone, doesn't uniquely define the heights of the two text views but if you add a constraint that sets their heights to be the same, then all the constraints together will have a unique solution (because the labels have well-defined default heights).
I hope my explanation is clear enough.
I'm trying to understand how autolayout works under XCode6, but there's a lot of mysterious things that runs away from my mind. Autolayout and constraints philosofy can be very hard to learn, but I realized that life can be easier using these tools...
For your information, I need to build a chat view with a table (the messages) and a view containing a text field (the send message pane) nested in a UIView that is again nested in a UIScrollView, so I can shift up the scroll view as the keyboard appears under the textfield.
I read a lot of tutorials and watched a lot of video until I found the useful tutorial Using UIScrollView with Auto Layout in iOS. There's a Xcode project in Github of what the tutorial explains, too.
In his tutorial, Mike Woelmer tells that
One of the big pain points with the old way of setting up a
UIScrollView was communicating the content size to the scroll view. It
was fairly straightforward to calculate your content size if the
content in the UIScrollView was an image. But it was not as easy if
your scroll view included a mixed bag of buttons, labels, custom
views, and text fields. Lengthy code adjustments were needed to
reflect constant changes in device rotations and phone size
differences.
So Mike explains the way to adapt the UIView, using placeholder and forcing the view inside the scrollview to fits the device's screen, creating in viewDidLoad some NSLayoutConstraint:
The solution is to look outside the scroll view and attach a
constraint to the view controller’s main view. This cannot be done in
interface builder, so we will have to write some code. Interface
builder is still complaining, though, so we have to add a placeholder
width constraint to make it happy.
I tried to use parts of the code of the tutorial for my project, but I cannot get a working view controller for my needs (I always get errors). Which is the best approach to do this? Am I on the right road?
Last but not least, I'm italian, so pardon for my english. If something is not clear enough, please leave me a comment.
Basically you have to set both alignment and size constraints in order for Autolayout to take care of the rest for you. If you don't provide enough information you get warning. If you provide conflicting information you get errors.
You need basically to provide enough information for Autolayout to calculate the UIView frame property (i.e., x-position, y-position, width, height).
For example, by providing the distance constraints from the top, right, bottom, and left edges, Autolayout has enough information to draw that UIView's frame rectangle. But you could also provide just the distance constraints from the top and left edges and then provide a size and height constraint.
You can also configure the key constraints you need and then click 'resolve auto layout issues' and choose 'add missing constraints' though sometimes it doesn't give you what you want. It is better to understand that how Autolayout accomplishes what I described above.
If you mess up, it's usually easier to clear all the constraints and start over. Do it a few times and you'll get the hang of it.
I have a UIView and a UITableView. I'm trying to align them in a way so they are sticked to each other. The UIView has a fixed height and I want the UITableView to consume the rest of the horizontal space.
I applied a set of constraints which got me pretty close to what I want to achieve but there's a problem that I don't know how to solve. The layout is OK in the portrait orientation but there's a gap between the two elements in the landscape mode. Please see the screenshots below.
Here are the constraint setups for the elements.
UITableView: (all constants are set to 0)
UIView: (all constants are set to 0 except for Height)
Thanks in advance.
I had the same issue of that space appearing above the top cell of a UITableView.
Like yourself, I looked into the constraints and the properties of the table, though the only way I could fix the issue was to delete the UITableView altogether and re-insert it.
Once re-inserted the gap was gone.
So, i am new to xcode and iOS7 and i'm trying to create simple container with two elements inside.
I prefer to make it 100% programmatically. (no IB)
I want to create container with two elements Image and Label.
I want to achieve variable width depends on the text element inside.
Here is example:
Based on user action i want to change text on the fly. Let's assume longer text, and main container have to change width too.
And now the question is: What is best approach to to that?
UIView with subviews or something else i'm just expecting direction.
Code examples with be gratefully appreciated.
Thank you in advance.
What you have described is exactly what a UIButton does automatically: it is a container containing an image and a title (text) and it resizes itself automatically when the text changes.
Let us assume, however, that you want to do this yourself. That is, let's say you want a UIView ("container") containing two other UIViews (subviews). Then we need to discuss this requirement:
Based on user action i want to change text on the fly. Let's assume longer text, and main container have to change width too.
This is not going to happen automatically. You can use constraints (auto layout) to describe the size / position of the subviews in relation to the superview, but it works the other way: the superview changes, and the subviews obey. So you will have to change the superview size manually after you change the text.
You can still use auto layout to help you. Let's say the text is in a UILabel. Well, a UILabel wants to change width automatically when the text changes. So far so good. But you must still change the container view width yourself. You can call systemLayoutSizeFittingSize: to learn what the size of the container should be, using constraints, working from the inside out; but then you will have to change its size yourself to that size.
(You can easily create the view, the subviews, and the auto layout constraints in code.)
If you don't want to use autolayout, then you will just calculate the sizes and positions of everything when the text changes and adjust it all yourself (in code). You can learn the size the label needs to be, to fit its text, by calling sizeThatFits: (or sizeToFit which will actually resize it correctly).
here is the problem i have a tow muti-line label with many content, so I use a scroll view to show them all
then I follow this to do the autolayout: https://developer.apple.com/library/ios/documentation/UserExperience/Conceptual/AutolayoutPG/AutoLayoutbyExample/AutoLayoutbyExample.html#//apple_ref/doc/uid/TP40010853-CH5-SW2
basic idea is to make a container view outside the scroll view to make sure the labels can fill the scroll view no matter what direction it is.
here is the hierarchy and constraint:
and the portrait mode works well:
but when it change to landscape mode some wired gap pops up!
and the more text i put in the label the higher gap i got!
my question is what should i do to kill those gap?
please give me some explicit solution or just give me an example, thank you!
and i am using autolayout in ios7, so some solution without coding are preferred!