I wants create a ViewController with UIScrollView, UIStackView (Vertical), UILabel and UITableView. But my problem is that I can't set different height sizes to my Views. I did tried write in the field, but XCode erases and set back value. I did tried all options of distribuitions, but I think that my option is "Equal Spacing".
I've added two UIView to test.
I did can make my screen, but this not works on iPhone device and XCode says that it's impossible adjust constraints automatically. This is my objective:
Some fields needs different height sizes. Some labels need 3 lines, other 1 line.
You need to set a height constraint in order for your view to have a specific height within the stack view. Apple's Documentation
If you add constraints to all subviews i.e. top and bottom it will work correctly. Make sure you set translatesAutoResizingMaskIntoConstraints to false
Related
I currently have a UIStackView that I add views to, it fits a maximum of 10 views along with a button. The issue however, is that although the views I add are equal size, the button is not.
I have tried adding a constraint that determines sets the button's equal to 1/11th of the StackViewSize (so that all of the views can fit equally), but it just seems to break all the other constraints.
How can I give the button size without breaking a million constraints?
Currently the height of the button is adjusted with each new view added, but that's just ugly.
First of all, set height and width to that button according to your requirement using AutoLayout. Then select your stack view from the Document Outline(in your view controllers hierarchy) & then in Attribute Inspector set its Distribution to 'Fill Proportionally'. Add some spacing if you want.
I had inserted a ScrollView into UIViewController and dragged ScrollView to fill the space between the navigation bar and the RAM label below:
But when I run the app, the ScrollView does not fill the space:
Please help me! Thank you very much.
P/S: Sorry for my english is bad.
The scroll view is not covering up the whole thing because you are running the app on a much bigger phone. The simplest solution is to run the app on iPhone 5.
However, if you want to solve the problem on all sizes of iOS device, you need to add constraints.
Constraints are things that tells a view when and how much it should resize and where it should be positioned.
To add a constraint, just select the view you wish to add a constraint to and go to the bottom right corner. You will see 4 buttons:
The leftmost button is used to embedding views in stack views. This is a feature of iOS 9. If your deployment target is lower, just ignore it.
The second button to the left is for adding constraints related to alignment - where the edges of the views are, what its baseline is and where it is positioned in the X and Y axes:
The third button to the left is used to add constraint related to margins, width, height and how the width and height should change when it is asked to resize (keep the aspect ratio, for example):
The rightmost button is used to let Xcode decide what constraints you should add. And I think most of the times its choices are okay. Sometimes though, you still need to do some tweaking before it works.
"So... what constraints should I add?" you asked.
Well, I think I should teach you how to think when you want to add a constraint. This way, you can figure it out yourself in the future.
You should first let Xcode guess what constraints you want. Just click the rightmost button and click "Reset to Suggested Constraints". This can save a lot of work if Xcode can get it right. So remember to always do this first.
Then, run your app on various devices and see if the view's position, size, and alignment are as you expected. If it is not, you might have to add and/or remove some constraints.
For example, if you found that your view is always the same size on different devices, (that could be bad because it means that some content my go out of view on smaller devices) it's probably because Xcode added a width and/or height constraint to the view. You should delete that so that the view's width and/or height is not fixed.
You can find your view's constraints in the view hierarchy:
Just select the constraint and press delete.
Uncheck Adjust subview option and add
scrollview.view.autoresizingMask = [.FlexibleWidth, .FlexibleHeight]
You need to add constraints for your scrollView. Set the leading and trailing constraints to 0. Pin the height of your scrollView and also don't forget to set the top layout constraint. You can either pin the height or add bottom layout constraint to your page control.
Constraints are very important and its even more important to set it correctly. Check the Apple Documentation - Working with constraints in IB
Uncheck constrain to margins and add 0 every one of the four limits of spacing to nearest neighbour.
My guess (from the little information we have) is that you are creating a constraint from your scrollview to the top of your view with a value equal to the height of the navigation bar. Set the value of this constraint to 0.
Just set the 4 constraints to 0 to the area you need and then uncheck the "Content Layout Guides" checkbox in the constraints tab here. It will automatically adjust to the area you have specified.
The checkbox to uncheck
I am trying to add some 5-6 UILabel's (Single line only) in a UIView using auto layouts. I have added constraints for top most & bottom most UILabel. The problem is variable screen sizes.
Just wants to know a better approach of adding those remaing (3-4) middle UILables (As I want to show equal space between all the UILabels).
Approach 1 - Add height constarint for middle lables & based on screen size change the height constraint constat at runtime.
Approach 2 - I tried adding >= and <= constarints but I am not getting the output as desired.
Any help, how can I keep constant height between all UILabels.
(Can be achieved via UIScrollView or UITableView but I dont want scrolling .. only using auto layouts:))
You can add dummy UIViews between your UILabels and set those dummy views' heights to proportional to their container.
Or you should be able to achieve that by setting your current constraints constants at runtime and then calling setNeedsLayout&layoutIfNeeded
You can't achieve that by playing with "less than" or "greater than" constraints.
Edit: You can also use UILayoutGuide to do that on iOS9.0+
You can use stack view from left window where you have button/label/view etc..... or also you can add it from constraints tools(see attached image)
If you are looking for the attached solution, please add below constraints shown in the third image.
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.
So I created this scenario in order to understand how views increase in height according to their content. However am still not able to make it happen.
This is what I have now:
the textview is growing according to content. however the uiview containing it is disappearing. what constraints should I use so that when the uitextview becomes bigger, its parent view also increase in height?
Start by clearing all your constraints from everything so we have a fresh slate.
Step 1: Build your view hierarchy. In this example, we want something like this:
The view controller's view, which we'll call parentView has a subview, which we'll call redView. That redView has a child, a Text Field, which we'll call textField.
The hierarchy looks like this:
Step 2: Set any constraints that are specific to any individual view. In this case, we probably only want to set a width constraint on our text view. For now, I'll just set a width of 200pts.
Step 3: Set the constraints between textView and its parent, redView. Let's say we want a 10pt border all the way around. Let's add these constraints:
Once we've added these constraints we'll gets some auto layout warnings and errors. For starters, because the constraints I added for with and space to superview don't match the actual sizes, I'll get some warnings like this:
There will also be some errors describing missing X and Y positions for redView and for textView. There are really twice as many errors here as necessary. textView knows where to position itself relative to redView. We don't need more constraints to sort out textView's position. However, redView doesn't know where to position itself yet... and so ultimately, textView also sort of doesn't exactly know.
We can update the textView's frame to get rid of the warnings, but let's go ahead and fix the actual errors.
Step 5: Set up redView's constraints relative to the superView. redView already know what size to be. Notice we had no errors for redView's width. It just doesn't know where to be. In this case, I'll go simple and say we want redView to be centered. So we'll want to add these constraints:
Now we've fixed some of the problems. The only problem that remains is the height for everything.
To fix this, we must set the content sizing priorities of textView. Set these all to 1000 and change the "Intrinsic Size" property to "Placeholder".
By now, all of the auto layout errors should be gone and we should only be left with warnings because our storyboard frames don't match what our constraints say they should.
We can fix that by selecting parentView and updating all the frames:
There's one final caveat to this auto layout puzzle when it comes to autosizing based on content size: what happens if our text view has no content?
If our textview has no content, auto layout will choose a height of 0, and our users won't even be able to see that there's a text view there, much less tap in it to add content (and make it expand). When using auto layout and content-based sizing, we should almost always be sure that we've set either an explicit or minimum size for the content view.
We don't have to worry about our textView's width, as we set this explicitly to 200. So let's add a minimum height constraint. Start by adding any height constraint:
Now go to the size inspector for the textView, find this height constraint we added, and edit it into a greater than or equal to constraint:
Storyboard won't reflect the change in content in our textView and resize it appropriately, but your constraints are now set up correctly and this will behave appropriately on your device or in the simulator.
ON UITextView make your you unselected These
Scrolling Enabled
Bounces
Bounce Horizontally
Bounce Vertically
Shows Horizontal Indicator
Shows vertical indicator
Now Change your auto layout constraints like this.
On the Storyboard Page, click on your textview.
Then click on the small triangular in the lower right corner.
Click first on "Clear Constraints".
An then on "Add Missing Constraints".
Its the easiest way.