I have a grid made of iOS buttons (think Sudoku). I assigned each button to have aspect ratio 1:1. To further ensure their equality, I have made each button have width = height constraint set.
However, when I look at the buttons, some of them have 44x45, while others have 44x44 (as expected).
Is there a constraint that I'm missing or is there a workaround that can guarantee my buttons are perfect squares.
This is probably happening because you have other constraints affecting the views too. For eg. You might have put these in a container view and specified container views width or made container view's width equal to the width of screen.
Now when these square view fill the container view, then there is some extra space left say for eg like 7 points. What autolayout does is that it adds these 7 points making some of your squares wider by 1 point.
This can be fixed by providing the correct constraints for the container view.
Related
I don't really understand constraints and have tried many different suggestions found online. All they seem to do is bunch everything up on top of one another or do nothing at all.
I have the following IPad application but I want it to work on any size device, mainly a IPod touch.
The page is simply two buttons that I want to remain the same no matter what screen they're on.
Any help on this appreciated.
It helps to think about points of reference that won't change with different screen sizes. Sometimes you want things on, say the top left corner so you just do constraints to the top and the left.
I'll give you two suggestions
Suggestion One
For your case, it seems like you might want to do constraints off centerY since you want them to be in the middle despite the screen size.
So I would make a constraint to "Center Vertically in Container" and then tap on the constraint and adjust it's value to negative or positive, so that way it's always X pixels above or below the centerY.
Now that's not going to be enough. it knows it's Y position but it doesn't know its height, width, or X position. So you need to add enough constraints to satisfy those.
A few examples:
X/Width: Two constraints to leading and trailing on each button OR Center horizontally and fixed width constraint. (again be careful with fixed width constraints since screen sizes can change, sometimes it's what you want though)
Height: Yeah just give it a height constraint in this case.
Note that this means no matter the screen size they'll always have the same gap between them (and maybe different gaps to the other edges).
Suggestion Two
Use a container view, either a stack view (fill, equal spacing, vertical alignment, a spacing value for gap between) or normal view.
You can make the view a fixed height based off the height and spacing between the buttons you want. Then simply center that container view horizontally and vertically on the super view.
Nonsuggestion
There are certainly other ways (like using buffer views with equal heights constraints. So you'd have an invisible view on top, a view in between and a view on bottom. and you'd give those equal heights constraints and align the buttons to the edges of the invisible views surrounding them. As long as you gave the buttons a fixed height this would work for vertical constraints) but I think these two would probably be the best.
I am trying to do the constraints for these horizontals button. I want the ratio of size of buttons to be the same, and the icons to be of equal widths and heights of each others.
Any idea of how i can do that so these buttons resize properly according to the screen size? Thanks!
Make groups of UIView containing the icon and text. Lets call this container view
Place all the n container views inside your storyboard as you would like them to appear. Now:
To the left most container view add a leading and bottom constraint to the super view.
Now to the second container view add a leading space of 0 (or anything you want). Control + drag your second button to the first button. Hold down shift and select equal width, equal height and align bottom.
Now apply the same constraints as your second container view to all your n - 1 container view. n being the number of container view you want to add. Now to your last (nth) container view add, one extra constraint, which would be a trailing space to the superView. Now all your container view ought to have an equal width that will be determined depending on the width of the screen!
If you want to have a specific height or aspect ratio to all your container view. Just add the height or aspect ratio constraint to your first container view and all your subsequent views will get updated accordingly.
OR
If you wish for the height to be dependent on the screen size and not maintain a specific aspect ratio, then you will have to give the first container view a equal height to the whole view with a specific multiplier like 0.15.
You will also have to add appropriate constraints to the icon and label present inside each UIView
Edit: A much easier thing for you to do would be add the icon as an image to the UIButton and add the text as you would normally to the UIButton. The UIButton will appear quite similar to the screenshot you posted. And then just apply the constraints I mentioned above.
Set the width and height as ratio of the SuperView. Set if for one button and for the remaining buttons make the height and width equal to the first button for which you defined the height and width in terms of superview height and size. Use this SO Post to see how to set height and width as ratio of the superview.
Hope this helps.
It's Simple because your All buttons are in single Direction so you can use StackView.
Just simple first apply the equal hight and equal width to all your buttons
now select all the buttons and add them in the stackview
it will be in the right side bottom. (with the constraint icon)
now simple Apply add missing constraint. it will done the work by own and gives better result. (but take care here apply it from the all views in View Controller Section)
And now Bingo try this every Size will show same.
This will work same in simulator also.
The solution is very simple.
See the image below (5 buttons)
The first (blue) button is pinned to the left and bottom of the superview
Each of the other 4 buttons (red, black, green, pink) are top aligned to the first (blue) button
Each button is using a horizontal spacing to the previous button (with a constant of 0). So red button has 0 horizontal spacing to blue, black has 0 horizontal spacing to red, etc
The Last (pink) button is also pinned to the right of the superview
Finally all 4 other buttons are set to have same width to the first (blue) button
That's it!
As for you icons, all you need is to set them to have same width & height to the first icon you have
So I have an app I'm working on, but I hit a major problem. In this app we have several images. I'm learning AutoLayout, and I can make stuff appear the same on all device screens, except for the fact that the images (and for that matter, everything) remain the same size. I want them to get bigger and smaller according to screen size. I've tried everything I know. Help!
Here you can use propotional width and height to the superView. At first Ctrl drag from your imageView to superView and set Equal Height and Equal Width. And now set the Propotional height and width to the superView from the constraint list. Here you can set your height and width with Propotional to superView with Multiplier option. And finally set your x and y position of your image Final Image. Here I have used horizontaly and verticaly centered.
Using the image here as an example:
First, place your imageview where you would like it, in terms of how far it should be from borders of the view or other objects.
Then, click on the small tie-fighter like icon in the bottom to bring up the add new constraints window.
From there, click on the four links show in red inside the red box. These tell XCode that it should be "80 units from the left most object, 80 units from the right most, etc".
Now, when you change to different devices, it will always adhere to those standards.
However, depending upon the size you selected, it may not work under certain conditions such as being rotated to landscape, or in a split view on an iPad. This is where you get into the other size classes, which you access by clicking the text at the bottom of XCode that says "w Any h Any".
One item of note, do not select the image size in width or height in the constraints window seen below. Doing so will constrain the image size, invalidating the margins put in place.
Suppose that I have the following view controller and this is how I want to see it on all iPhone:
If I run it on iPhone 6 it has the following look:
Here you can notice that UITableView not fit the whole screen and UIImageView doesn't placed at the bottom of the screen.
How can I achieve the required behavior via constraints in XCode 6? I thought that I need the following constraints:
Leading space and top space to container margin for UITableView
Bottom space and trailing space to container margin for UIImageView
Vertical Spacing between UITableView and UIImageView
But it doesn't work as expected even after auto-resolve constraints issues:
Thanks in advance.
Ok, a few things here:
Each view needs enough constraints to define it's x and y position, and it's width and height unambiguously. To start with, go back to Interface builder and delete all of your constraints and lay out the view as you would like it to look. You want to have control over every constraint added, don't let IB automatically resolve the issues, as in all likely hood it won't do what you want.
Do you have an image that is the size you want it to be on screen, once you've factored in #2x, #3x etc? If so, then your job will be easier, as the width and height of the image view can be defined by the width and height of the image (ie the image view's intrinsic content size).
In order to use Autolayout effectively, you need to think about your view holistically, and think about how you want your views to behave when the screen size changes, be clear in your head about the behaviour.
To achieve the layout you want, I would do the following:
Constrain the tableview's leading, top and trailing edges to the superview, with a constant value of 0. This means it can get wider and thinner with the device, it will stretch horizontally, but always stick to the top. This has defined the tableview's x and y position, as well as it's width (height still to go, but keep reading...)
Constrain the image view to match the horizontal centre of it's superview (x position defined) and constrain it's bottom edge to the superviews bottom edge (y position defined). If've you've got the right sized asset, then that will take care of the width and height too. If not, you could go ahead give it explicit width and height constraints.
Now we can constrain the tableview's bottom edge to the top of the image view, with a constant of 0 (ie touching). Note we haven't give the table view an explicit height constraint, so as the device screen grows vertically, the table view will stretch vertically.
Autolayout is hard at first. I'd recommended lots of reading to get over the initial hump, really get to know what a constraint is doing, it's limitations, and the way in which the system parses constraints to translate them into frames. This book is really good, and really helped me learn:
http://www.amazon.co.uk/Auto-Layout-Demystified-Mobile-Programming/dp/0321967194
Best of luck
First make sure you have selected the correct size class. The 'Compact Width | Regular Height' size class must be selected in the Interface Builder. Now add the Trailing space,Leading Space, Top space and Bottom space constraints to the table view. For the image view set the view mode to Aspect fit and add the constraints : Align Center Y ,Top space,Bottom space, Leading space, Trailing space and Aspect Ratio .
I'm new to autolayout and i'm kind of stuck on how to center these 4 images in all different devices like it looks on the images. i've tried to apply the auto configured constraints but then it will have that distance and that does not fit on all devices. So my question is what constraints do i need to apply on all different images in order to make all image centered with same distance?
Here is how my cell in storyBoard looks like:
image of the constraint options on image 1:
image in simulator:
/// MY TRY ////
Here you can see the constraints that i've added and the result?
result:
Your approach is almost correct, it simply lacks size constraints for the images.
If you want to dynamically resize the images and keep the space between them constant, put constraints on the images for the width to be >=20(or any other value, depends on your needs) and a constraint for keeping the aspect ratio. Then ctrl-drag from UIImageView1 to UIImageView2 and set a constraint for equal widths. Repeat that from UIImageView1 to UIImageView3 and from UIImageView1 to UIImageView4.
If you want the images to always keep their fixed size and dynamically sized spaces between them you need another approach:
The trick here is to place 3 empty UIViews between the UIImageViews so that it looks like this:
Set constraints to the top for all views
Set constraints to the left and right for UIImageView1 and 4
Set constraints for all UIImageViews to the same width
Set constraints for all UIViews between the UIImageViews to the same width
Set constraints for all the distances between the views to 0
Set the width constraints for the UIViews to >= 0
This way makes the empty UIViews between the UIImageViews to resize dynamically and all the same width.
I hope you get the idea.
For the first image add a leading space to superview and for the last image add a trailing space to superview and add vertical spacing between first and second, second and third, third and fourth and also set horizontally center within the container to each of the images
The objects on your storyboard require at least 4 constraints per object.
When there's orange lines around the UIImageView object like appears in your question, this means a constraint is missing, or conflicting and can often mean the image does not display at runtime like you'd expect.
In the first instance I recommend you select all objects and 'clear constraints', then start again.
Although not exactly the same, here is a link to an answer which explains the auto-layout constraints in a bit more detail. Once you understand it, auto-layout can be very powerful.
>>Link to similar auto-layout issue - iOS CustomTableViewCell: elements not aligning correctly<<
I hope this helps
If you want the images to always keep their fixed size and dynamically sized spaces between them then very easiest way first you drag the four UIView in your StoryBoard
set constrain top left right and height for all the UIViews and give the equally width to all the UIViews(drag from one UIView to another and sets its equally width repeat this work for all the UIViews).
Image about layouts
Secondly you have to drag your images set in these UIViews and sets their constrain height width and centre horizontal in container and centre vertically in container.
In last set the background colour of all UIViews default(white) you get the result it will work....i assure.
Screenshot of Xcode