I have a UILabel whose size is determined by the distance of the view on top of it and the view at the bottom of it. The height of the UILabel will typically be different depending on the device. It seems that when Auto Layout stretches/crunches the UILabel's height, the text in it clings to the top of the UILabel as if the UILabel had a vertical alignment of text set to top. How can I force the text to be centred vertically?
While not understanding the perks of having Auto Layout stretch UILabel:s, I used an extra UIView in the place of my UILabel, and had Auto Layout stretch that one out instead. Then I put my UILabel centre of that containing UIView. No more constraints used for the UILabel. Seems to work great for now.
Click on the Label.
In the right side pane, select "Attributes Inspector".
For "Baseline" property, choose the option "Align Centers" to make the text centered vertically.
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I got a UIView whose child is a UILabel. I then aligned the left, top, right, and bottom of the UILabel to that of its superview (the UIView) using constraints.
But what I'm getting is a UILabel that matches the height of its superview but not its intrinsic height (smaller or larger than its text content depending on the size of the UIView). What I expect is for the UIView to resize itself to fit exactly the height of the UILabel.
So how do I do this using only the interface builder?
In order to make the UILabel keep its size and force the outer view to resize you can update the values for Content Hugging Priority to 1000 (a.k.a. Required). This can be done in the measurements panel when selecting the label in Interface Builder.
I think they are set as a default to 750.
This should (if there is nothing else causing the change) make the label take its intrinsic content size and force its superview to conform to that size also.
Align top, trailing, bottom and leading of UILabel with UIView (add constraints).
Remove height and bottom constraints from UIView if any.
If the content is large, you probably need to wrap UILabel into a UIScrollView in place of UIView. and add a bottom constraint to UIScrollView
Content Hugging Priority of UILabel (251) is more than that of UIView (250) by default. Verify this
It's super easy using auto-layout. Just, follow these steps
1 - Drag a UIView and align it vertically and horizontallyin centre.
2 - Now drag UILabel into the UIView and align the label also horizontally and vertically in centre.Now, the IB aligns the label at the centre WRT to the superview and not the UIView.So, change that in the size-inspector section.
3 - Once you have done that and all red lines are removed, select both the label and the UIView together using the command key.
4 - Now, give them constraints as follows
leading = 0, trailing = 0 and select the equal width and equal height.
There you are done.If you wanna test that the UIView size is respective to the label's content, try increasing the label's font to a bigger size and you will see that the size of the view will be the same as the size of the label.
There , you are done :-D. Hope, this was helpful.
If someone is experiencing this issue, while:
Having 2 labels inside the UIView
Doing everything what was suggested here
In my case, I set Vertical Content Hugging Priority of BOTH UILabels to 1000. Then one of the labels had a different font. (ie. one label was supposed to be smaller than the other one)
The height was being ambiguous, because both labels were trying to force their height on the superview. Once I lowered the priority on the smaller label, everything worked fine.
If I put a UILabel in a view and specify a vertical space constraint and an horizontal space constraint, it's fine.
If I do the same with my custom UIView, IB will complain because it'll lack an height and a width constraints.
I guess it comes from the fact that UILabel can expand both vertically and horizontally. But so does my custom UIView, so how can I inform that my view has such rights?
The default behaviour for a UILabel is "Fit To Content"(Editor-> Fit To Content). This means that UILabel will grow as the Content increases for a given font size. For a view to position itself, it needs X, Y, Width and Height. Width and Height are given by the text it contains. Rest two properties you have already provided. I hope that answers your question.
I already set UIImageView.width（Green Color Background） == UILabel.width + 20 in my tableView cell ，but when the label's content changing , the label 's height is changing at first ,but I want the label to grow wider first , if it can't be more wider then grow higher. what 's the problem here
Hi yes you can do it. I am explaining below how can u do it with auto layout.
At the time of applying constraint, instead of giving hight and width
to UIImageView just try to give it three constraint with UILabel which
are " Equal Width, Equal Height and Aspect Ratio"
For Applying these three constraints with UILabel the shortcut is just
drag and drop your mouse cursor from UIImage to UIlabel with right
click only, so you can see above three options. After applying it ,give
UIlabel Leading and trailing constraint( or whatever u want) and most important thing, set
your UIlabel to size to content fit. For UILabel,shortcut is just
click on UILabel and click on top toolbar's tab EDITOR and you will
find option for setting UILABEL as size to content fit so after
setting it UILabel will automatically set its frame as per its content
and so as UIImageView.
Basically, I have this situation:
Two UILabels in a UITableViewCell. They're both constrained to the top of the cell. One is constrained to the left of the cell, and one is constrained to the right of the cell.
There exists a change that the UILabel on the left can run into the UILabel on the right. Is there anyway to truncate the text x points before it gets to the UILabel on the right?
Right now, I handle this by giving the UILabel on the left an explicit width that ensures it will truncate before reaching the UILabel, but the explicit width is not dynamic based on screen size. If there is a larger screen size, it might not need to be truncated. I'm new to iOS development and am not sure how to do this.
The best way to achieve this is in auto-layout. Make sure the label on the right is a fixed size, you can even change it programatically if you need to accommodate to screen size. But the thing is this one needs a width constraint. The label on the left does not have a width constraint, instead do a horizontal spacing in front of it to the cell border and from it's trailing end to the start of the label view on the right. It will widen and shrink to fit the size that's left for it.
I have a UILabel that is positioned on top of a UIImageView. The text can be various lengths, so it is necessary that I make the label as large as possible (The same size frame as the imageView). The problem is, I don't want the text from the label to cover the image by being directly in the center of the image. It's easy to set left alignment in a UILabel. Any clue how to set vertical alignment as well? Basically I want the text to hug the bottom left corner no matter what length it is without being cut off.
You can accomplish this with Autolayout. If you set up your constraints so that the label is fixed to the bottom left, but don't set a height constraint, Autolayout will use the label's Intrinsic Content Size. This just means that as the label gets more text / changes font / etc, the label will grow in height and will only ever be tall enough to contain all the text in the label.