I need to truncate some multi-line labels with ellipsis. However, setting
mylabel.lineBreakMode = .ByTruncatingTail
mylabel.adjustsFontSizeToFitWidth = false
reduces line spacing. Is there a way to keep the original line spacing?
Ended up truncating manually by whitespace which has two advantages:
words are not broken in the middle, and
sizeToFit sets height more precisely
(I need not-more-than certain height and the label has shadow so exact height is unwanted).
Related
I have a UITextView whose height I would like to limit to some reasonable value, with the text truncating if necessary. How can I make sure that the height of the text view matches that of the truncated content? If, for example, I set the height to a fixed value, there will some variable space at the bottom of the text view which will affect the layout of items below it.
Is there some way to set a desired height, measure the truncated text, and then use that measurement to more precisely adjust the height? Is there even a way to measure the height of the displayed text within the UITextView?
Edit
I need to clarify:
I do not need help truncating the text. As you can see from the screenshot, the text is truncated already.
I cannot measure the text because I would need to measure the the truncated text, which I don't have access to.
The gap at the bottom of the text view is not related to the textcontainerInset.
This is how the screenshot is currently built:
The text is set to some long string.
The text view is artificially constrained to some height, let's say 300. This produces the truncation.
Because 300 is not a precise multiple of the line height, there is some additional space below the last truncated line.
What I would like to do:
After sizing the text view to 300, measure the precise height of the truncated text so that I can then resize the text view a second time to fit it without the additional spacing (e.g. set it to 285 if that is the measured size).
Or, some other method to achieve the same end result.
I expect it's truncated because of your constraints. So you need to calculate the text size in the code and update the constraint value:
let boundingRect = (textView.text as NSString).boundingRect(
with: maxSize,
options: .usesLineFragmentOrigin,
attributes: [ .font: textView.font ],
context: nil
)
heightConstraint.constant = boundingRect.height.rounded(.up)
The result of this operation is float and not related to pixels. When the view size is calculated by the constraints, it get's rounded to pixels (0.5 or 0.333...), that's why we need to round it by ourself to exclude unpredictable cases. To get pixel perfect height you can round it according to screen scale:
textViewHeightConstraint.constant = (boundingRect.height * UIScreen.main.nativeScale).rounded(.up) / UIScreen.main.nativeScale
Also, as #nghiahoang mentioned below, don't forget to zero the insets
textView.textContainerInset = .zero
Here's my sample project
Compile the solution of Philip and set the inset.bottom to 0
textView.textContainerInset.bottom = 0
Directly, it is not possible. If you want to do it, you have take UILabel behind the UITextView. Because UILabel has the property to auto extend the height and width based on text. Now. set equal constraints of UILabel to UItextview.
what should be constraints, let me explore step by step :
set leading and trailing of UILabel.
Fix top constraints of uILabel.
you not need to set height constraint but if you want, you can set greater than equal to constraint of constant 20 or 30.
Now set leading, trailing,top and height constraints of UITextview equal to UILabel.
Now whatever you set text in UIlabel , give it to label as well. I did not in past. If you will find any issue please ask in comment
I have a UILabel that I'm using inside a container view. I'm using AutoLayout entirely programmatically--no xib or storyboard. My UILabel constraints (no height constraint set, large fixed width, top and left edges pinned, numberOfLines = 0, bottom of superview pinned to bottom of label) work perfectly for normal (around 13 or 14 point) sized text, but at large (60 point) size text I started noticing large gaps of extra space above and below my character; in this case, the capital letter "S" that's an NSMutableAttributedString. The only attributes for this attributed string are the font name and a kerning value of 1.0. Below picture shows a magnified screenshot of my label from Pixie (white square shown is from that program) with my UILabel's backgroundColor in red:
After doing lots of research (Ignore Ascender and Descender when centering UILabel vertically?, iOS - Get the "real" height of a letter, Vertically center text in UILabel depending on actual visible letter height), it seemed the reason I was encountering this issue was because of the ascender and descender values for this font aren't getting used in this case (this is a capital "S," so it would seem I just need its capHeight value). So, I decided to constrict my label height to this value, and did so by setting a height constraint equal to its capHeight value after the "S" attributed text is set. Doing this produced the following image:
As you can see, the text is now clipped in the label. As a sort of hack, I figured I'd add some padding to counteract this, so multiplying my capHeight value by 1.1 yielded the following image:
That's fine for some padding, but now there's 4 px of extra space at the top. Granted I'm zoomed in very far, but I'm not sure why I'm seeing this—I would think that since the height constraint is set to the height of this capHeight value (which has some extra added for padding now) that the "S" would be vertically centered. I've tried calling setNeedsLayout on the label, but that didn't do anything. These are the things I would love to know:
Why is the capHeight value either not returning the correct value and/or setting the label's height constraint to this value is causing the text to get clipped?
Why do I need to add padding to the capHeight value?
Does anyone have any suggestions on how I can get this text vertically centered after I add padding and/or why it's not happening automatically? I saw this answer (https://stackoverflow.com/a/17376146/482557) but wasn't sure if that would apply here.
Thanks!
I Need a label in my UI to hold up to 32 characters without distorting, so I enabled auto shrink and changed the number of lines to 0:
heres my label on the IB:
now when I run the application it runs off the screen:
how can I make it fit accordingly?
You don't want the number of lines to be 0, because that will tell the label to use any number of lines that it needs. You also have to constrain the label's right edge to its superview's right edge, because without that, it'll run off the right side, as you can see.
remove constraints first
give the width 0 and apply width constraints . Click on the constraints change width constraint = to >= after which side you want (left or right) apply top space and (trailing space or leading space) apply two constraints.
clear the lable text.
try it and let me know after this wat is th problem.
You are on right direction. Set minimum font size and maximum font size of the label and not need to truncate characters, not need to set number of lines. Autoshrink definitely works.
I have a UILabel with multi lines. I'm trying to get the text to auto size, and fit on the line it's in. So instead of:
longe
st
The text size should become smaller so that it can fit on the same line:
longest
Note: I only need it for the first line.
I tried the following:
label.adjustsFontSizeToFitWidth = YES;
label.minimumScaleFactor=3.0;
That didn't work, so I tried label.minimumScaleFactor=3.0 / 9; (9 is the font size.) That also didn't work.
I have a UILabel with multi lines
Well, that's the problem. The automatic size adjustment feature of UILabel works only for 1-line UILabels (i.e. numberOfLines must be 1).
You might be happier with two labels, one being a single-line UILabel for the first line which can shrink its size, the other for the remaining lines.
I want to show the text in uilabel. The text is ,000124520.061112782.,3299985343, I have assign line break mode to character wrap and number of lines to 0. But in label first line is displayed only the , and then other characters are displayed in next line. But i want to display the text in two lines only. But it is displayed in three lines. I don't know why , is displayed in first line. Please anyone help me.
You should set the numberOfLines of your UILabel to 1.
When the numberOfLines property of a UILabel is set to 0 the UILabel will render its text over as many lines as it needs - e.g. its infinite. To fix your text to a single line you should therefore set the property to 1.
Obviously your text may not all fit on a single line so you should also set the UILabel's minimumScaleFactor property to allow the UILabel to adjust its font size downward (to the supplied limit) to fit the content into the frame of the label. You will also need to set the UILabel's adjustsFontSizeToFitWidth property to YES.
Further to the above an easy way to calculate the value for the minimumScaleFactor property is to divide the minimum font size by the maximum font size. So, say for example your label's default font size was 12 and you were happy for it to drop to 10, then assign the minimum scale factor as follows:
myLabel.minimumScaleFactor = 10/12.0f;