I am learning auto layout from last two days, i have one UITableViewCell xib file and in this cell there is two Labels and one Button, How can i manage Horizontally and vertically space between this subviews of cell?
Thanks in advance.
This trick is to add empty placeholder UIViews between your labels/buttons and bind them with an Equal Width constraint.
Following images show how it is done for horizontal spacing. Purple colored views are the placeholder UIViews. You can later set their alpha=0 or make them hidden so they will not appear when the app is running.
Related
I'm trying to make a row of buttons on the bottom of the screen and the buttons are images. I was having aspect ratio issues so a few sites recommended making image views and simply put transparent buttons on top of them. I've placed six image views in a stack view and constrained it to the bottom. I thought it would make sense to put six buttons in another stack view and then also constrain it to the bottom, but it always constrains to the nearest neighbor so now the images are actually on the bottom of the screen, but the transparent buttons are vertically sitting above them. Is it possible to have both constrained to the bottom of the screen so that they completely overlap? Thanks!
It is very much possible, from what you have written I assume that your second stackView is pinned to the top of First stackView. Change that constraint to bottom of your superView. This would be enough for your requirement.
Also Instead of using two different stackViews, I would recommend doing this in one single StackView, which will 6 UIViews inside and each UIView will have UIImageView and UIButton inside.
(Thanks, Sujith Chandran and Neil Hiddink for pointing the way!!)
Here is my solution: After selecting the bottom constraint for the stack view that contained the transparent button overlay, I went to the size inspector and changed the "Second Item" to superview, opened second item again and selected bottom, and then set Constant to 0. Eventually I had to change the value of constant to -70 to get the desired position because I previously set the button images to a height of 70.
I have a UITableViewCell that contains two labels positioned vertically one on top of another, and I am using AutoLayout.
The cell works (and looks) fine when both labels have some text.
Sometimes, though, the top label does not contain any text, and in this case I would the cell to have the same height, but the bottom label to be centered vertically. Is it possible to do it with AutoLayout without modifying the constraints at run time?
I don't believe this can be accomplished without modifying something at run time. I see a few options if you'd like to do this without changing constraints programmatically, some messier than others:
First option, you could set three labels in the cell. Two labels that are stacked vertically and one that covers the whole cell vertically, fully overlapping both other labels. At runtime you can determine if the bottom label shouldn't contain text and then set the overlapping top label with the text you would have previously set on the top vertically stacked label.
Second option, you could utilize a label that has the height of both labels you currently have. Set this new (2x height) label to allow for 2 lines (can be done in InterfaceBuilder side options). Then at runtime interpolate the label.text attribute with both label's text. Put a new line character in between the labels if the second label has text. It would look something like this
In Swift:
my2xLabel.text = "\(firstLabelString) \n \(secondLabelString)"
In Obj-C:
my2xLabel.text = [NSString stringWithFormat:#"%# \n %#", firstLabelString, secondLabelString];
All of this being said, modifying the constraints at runtime may be a less hacky way to achieve this formatting.
Make two prototype cells then. One will be the one you have right now, the other would contain only one label but centred vertically. Check if the text would be empty, return the cell with the vertically centred label. Otherwise, return the other cell.
Question: How can I use constraints in a UITableViewCell using UITableViewAutomaticDimension when there are labels side by side which can each contain a different number of lines?
I have a table with cells that contain labels side by side:
I'm having a hard time getting the cell to size properly if one of the labels on one side have more lines than the corresponding label on the other side. One of the labels always gets cut off. If both labels have the same number of lines, the cell resizes perfectly and all text can be seen.
I've tried a number of constraint tweaks but nothing is working perfectly as desired.
I've tried adding hidden label for height...but it doesn't work well for the cell with 4 labels
I've tried placing the labels in a view but then the height of the view still needs to be calculated.
Currently the constraints are setup normally: top, bottom, left , right, labels are set to 0 lines etc and works great when both labels have the same text or same number of lines.
Is there any way I can do this with constraints? Or do I need to revert to the old height for row at index path? =(
There is a way to achieve what you want to do just using constraints. The trick is to set the relation of the constraints between the two lower labels and the bottom to Greater Than or Equal instead of equal.
Here is how I set the constraints:
Which has this result:
Or you could set the constraints between the labels top and bottom to Greater Than or Equal and leave the bottom constraint at equal:
To get this result:
I found a solution where I did not have to revert to using tableView:heightForRowAtIndexPath.
I added a label to the cell with the text color set to clearColor and called it 'heightLabel'. I added constraints to the heightLabel so the cell would resize based on the heightLabel's constraints.
Then whichever of the left or right labels had the most text, I placed that label's text inside the heightLabel.
The cells still were not resizing and I had to call 'layoutIfNeeded' on the cell before returning the cell in tableView:cellForRowAtIndexPath.
The heightLabel constraints are now what is being used to resize the cell and UITableViewAutomaticDimensions is working properly.
This may not be the best solution but it's working out pretty well. If there is a more proper way of doing this I'm open to suggestions.
I have an application in which I want to have a tableView with custom tableViewCell that has five columns.
I want them to be like 20%, 30%, 15%, 20% and 15% of the whole cell's width, because I want my application to launch on iPhone and iPad.
What is the best way to do this?
Now I have created a tableViewCell prototype with 5 labels. I also added constraints to them but the width constraint is just a constant. Also when I added width constraints to labels, some collisions appeared there and I don't know how to fix them.
Here is a screenshot.
You can create table view cell with collection view. By that, you can get different part in cell as well as you can change each column width programmatically based on your needs.
Thanks
A table view has only one column and allows vertical scrolling only. link
If you want to use a few columns, you can use UICollectionViewController
I also added constraints to them but the width constraint is just a constant. Also when I added width constraints to labels, some collisions appeared there and I don't know how to fix them
To fix it change width constraints to be a multiplier of superview width.
I am having pretty crazy amounts of issues trying to align two labels inside a table cell:
The problem is I need both labels (the region is clickable) to be centred within their cell. I can only seem to get the layout centred based one or the other.
Is this too much to expect from autolayout?
Embed the labels in a new view, then centre that view with autolayout. Also, let this new view resize itself according to the labels
So:
- Add leading and trailing constraints between labels and their superview (new view)
- Centre the new view in the UITableViewCell
I just got home, so I opened up a fresh project, with good news :)
So I set up what I described earlier, 2 labels inside an UIView
Select the labels and go to the Size Inspector, there check 'Explicit' and in the 'Preferred Width' add the Maximum - make it the maximum it is allowed to be
Now in code, you can set the labels and they auto-resize!