I need to know string height so I can set cell height. The problem is I am getting string asynchronous, and I need to know cell Height before creating collection view. And I need this to work with different languages (special characters).
String will be in a label inside the cell. I had some of my solutions, but one did not work with other languages, and the other did work but didnt get the real heigth.
CGRect rect =[yourLabeltextString boundingRectWithSize:CGSizeMake(yourLabel.width, CGFLOAT_MAX)
options:(NSStringDrawingUsesFontLeading|NSStringDrawingUsesLineFragmentOrigin)
attributes:#{NSFontAttributeName:[UIFont fontWithName:#"Helvetica" size:17]}
context:nil];
CGFloat height=rect.height;
Use the code above, and change the attributes to the one you prefered.You can get the height of your String.
try this function and i hope it will help you :
- (CGFloat)calculateHeightForLabel:(UILabel *)label
{
CGRect frame = label.frame;
CGSize size = [label sizeThatFits:CGSizeMake(frame.size.width, FLT_MAX)];
return size.height;
}
use it o Swift 5
extension UILabel {
func calculateHeight() -> CGFloat {
let size = self.sizeThatFits(CGSize(width: self.bounds.width, height: CGFloat.greatestFiniteMagnitude))
return size.height
}
}
Related
I have an existing UILabel that I created in Interface Builder, I would like to change its width in code, but I can't because of the auto layout. It's pretty simple, I have width from a CGSize and I wanna set it for the label. Actually my code works perfectly, I can assign the new size to the label, but unfortunately it doesn't redrawn itself. I've tried to use the textRectForBounds:limitedToNumberOfLines:and preferredMaxLayoutWidth without any success or size changes.
float heightIs =
[cell.lbl.text
boundingRectWithSize:cell.lbl.frame.size
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{ NSFontAttributeName:cell.lbl.font }
context:nil]
.size.height;
// get the width size of a string
CGSize textSize = [cell.lbl.text sizeWithAttributes:#{NSFontAttributeName:cell.lbl.font}];
CGFloat strikeWidth = textSize.width;
NSLog(#"TEXT WIDTH %f OF STRING %#", strikeWidth, nameString);
CGRect labelFrame = CGRectMake (0, 0, strikeWidth, heightIs);
cell.lbl.frame = labelFrame;
cell.lbl.preferredMaxLayoutWidth = CGRectGetWidth(labelFrame);
NSLog(#"LABEL WIDTH VALUE %f", cell.lbl.frame.size.width);
Could somebody explain me the right way? I'm not sure that where should I start it. Is it an option somewhere in IB or can I do it with code? Or I can delete all code because it can be done only with IB?
I want to have a UITextField that has the behaviour like this with the same fontsize:
But when I enter the same min fontsize as the original fontsize I get this behaviour:
What causes this behaviour and how do I solve that?
I do not want to resize the font. So adjusting the fontsize won't work
I think you have a setting wrong. By default, as you type on a UITextField it will keep the curser visible at the last entered character as the first example you provided does but with no change to font size. The shrinking behavior will only occur if you set adjustsFontSizeToFitWidth to YES. Try deleting the minimumFontSize and adjustsFontSizeToFitWidth settings.
Good question. AFAIK, it can't be done. But, you could write your own custom control to do this. I would start by dropping a label on top and take keyboard input to set the contents of the label.
Here's the code that should do the trick. You need to put your label in another view so it clips the text as it's being adjusted.
- (IBAction)field1_editing_changed:(id)sender {
NSString *text = self.field1.text;
NSAttributedString *attributedText =
[[NSAttributedString alloc]
initWithString:text
attributes:#{NSFontAttributeName:self.field1.font}];
CGRect rect = [attributedText boundingRectWithSize:(CGSize){CGFLOAT_MAX, CGFLOAT_MAX}
options:NSStringDrawingUsesLineFragmentOrigin
context:nil];
CGFloat padding = 5;
CGFloat width = rect.size.width;
width += 2*padding;
CGRect frame = self.field1.frame;
if (width > frame.size.width)
frame.origin.x -= width - frame.size.width;
frame.origin.y += 30; // I added this so you could see the label appear below the field (for testing only)
frame.origin.x += padding;
frame.size.width = width;
NSLog(#"%g, %g, %g, %g", frame.origin.x, frame.origin.y, frame.size.width, frame.size.height);
self.label1.frame = frame;
self.label1.text = self.field1.text;
self.label1.font = self.field1.font;
}
UITextField has a property adjustsFontSizeToFitWidth, see UITextField Class Reference.
You can set a big enough default font size and let the control reduce the text to fit the width. The actual font size will be between minimumFontSize and the size setting of font.
Similar to UILable, UITextField has a property
"adjustsFontSizeToFitWidth"
You can try to set this to YES
I am doing a project in which I want show an image if the text doesn't fits to the UITextView frame.
I am using the following code
if (self.textView.contentSize.height >= self.TextView.bounds.size.height)
{
self.imageView.hidden = NO;
}
I am using Autolayout also. Does it cause such issues
And one more thing is that, when I print NSLog, the value of contentSize.height was NOT changing according to the text UITextView was showing.
You can use this method to check the height of multi line text according to the font size used
+ (CGSize) calculateLabelHeightWith:(CGFloat)width text:(NSString*)textString
{
CGSize maximumSize = CGSizeMake(width, 9999);
CGSize size = [textString sizeWithFont:[UIFont fontWithName:#"Helvetica" size:24]
constrainedToSize:maximumSize
lineBreakMode:UILineBreakModeWordWrap];
return size;
}
you need to know
width of text feild
string
font
font size
iOS7
CGRect textRect = [text boundingRectWithSize:<text Feild Size>
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{NSFontAttributeName:[UIFont stuff here]}
context:nil];
CGSize size = textRect.size;
yes, if you assign text to textView and check its size in the next instruction in viewControllers viewDidLoad, it wont work.It will just give you what contentSize you had set.
Check the contentSize in viewDidAppear of ViewController, and it will work.
It worked for me.
Hope this helps,
I have a UILabel right now and the UILabel.text value changes regularly.
The problem I am having is that if each time the UILabel.text value changes, the UILabel width changes according to the content of the label.
How can I fix this? This is my code I have right now:
outputLabel.text = errorMessage;
outputLabel.hidden = NO;
[outputLabel sizeToFit];
UPDATE
The reason I am using sizeToFit is because I need the height to automatically change.
Thanks,
Peter
you can create a category or a subclass of UILabel and add this method to resize only the height of the label depending to the input text
- (void)heightToFit {
CGSize maxSize = CGSizeMake(self.frame.size.width, CGFLOAT_MAX);
CGSize textSize = [self.text sizeWithFont:self.font constrainedToSize:maxSize lineBreakMode:self.lineBreakMode];
CGRect labelRect = self.frame;
labelRect.size.height = textSize.height;
[self setFrame:labelRect];
}
and use it instead sizeToFit
Use [UILabel sizeThatFits:] with a CGSize with infinite height like (320, 10000).
I subclassed UILabel and overrode the sizeThatFits method to look like this:
- (CGSize)sizeThatFits:(CGSize)size
{
CGSize res = [super sizeThatFits:size];
return CGSizeMake(size.width, res.height);
}
Then if I add the label into a nib I place a UILabel from the object library. After that I make sure to set the class of the placed label to my custom class instead of the default of UILabel.
It basically just overrides the new width with the original width so it never changes width, but dynamically changes height.
Use following trick to do the job done:
First is set tag of uiLabel. My cell.yourLable tag is 998
cell.yourLable.numberOfLines = 0;
[cell.yourLable sizeToFit];
UILabel *myLbl=[cell.contentView viewWithTag:998];
CGRect frm=cell.yourLable.frame;
frm.size.width = cell.contentView.frame.size.width;
myLbl.frame=frm;
Here the trick is to get same UiLabel by tag and set its width by setting frame.
Is it possible to auto-resize the UILabel box/bounds to fit the contained text?
(I don't care if it ends up larger than the display)
So if a user enters "hello" or "my name is really long i want it to fit in this box", it is never truncated and the label is 'widened' accordingly?
Please check out my gist where I have made a category for UILabel for something very similar, my category lets a UILabel stretch it's height to show all the content: https://gist.github.com/1005520
Or check out this post: https://stackoverflow.com/a/7242981/662605
This would stretch the height, but you can change it around easily to work the other way and stretch the width with something like this, which is I believe what you want to do:
#implementation UILabel (dynamicSizeMeWidth)
- (void)resizeToStretch{
float width = [self expectedWidth];
CGRect newFrame = [self frame];
newFrame.size.width = width;
[self setFrame:newFrame];
}
- (float)expectedWidth{
[self setNumberOfLines:1];
CGSize maximumLabelSize = CGSizeMake(CGRectGetWidth(self.bounds), CGFLOAT_MAX);
CGSize expectedLabelSize = [[self text] sizeWithFont:[self font]
constrainedToSize:maximumLabelSize
lineBreakMode:[self lineBreakMode]];
return expectedLabelSize.width;
}
#end
You could more simply use the sizeToFit method available from the UIView class, but set the number of lines to 1 to be safe.
iOS 6 update
If you are using AutoLayout, then you have a built in solution. By setting the number of lines to 0, the framework will resize your label appropriately (adding more height) to fit your text.
iOS 8 update
sizeWithFont: is deprecated so use sizeWithAttributes: instead:
- (float)expectedWidth{
[self setNumberOfLines:1];
CGSize expectedLabelSize = [[self text] sizeWithAttributes:#{NSFontAttributeName:self.font}];
return expectedLabelSize.width;
}
Using [label sizeToFit]; will achieve the same result from Daniels Category.
Although I recommend to use autolayout and let the label resize itself based on constraints.
If we want that UILabel should shrink and expand based on text size then storyboard with autolayout is best option. Below are the steps to achieve this
Steps
Put UILabel in view controller and place it wherever you want. Also put 0 for numberOfLines property of UILabel.
Give it Top, Leading and Trailing space pin constraint.
Now it will give warning, Click on the yellow arrow.
Click on Update Frame and click on Fix Misplacement. Now this UILabel will shrink if text is less and expand if text is more.
This is not as complicated as some of the other answers make it.
Pin the left and top edges
Just use auto layout to add constraints to pin the left and top sides of the label.
After that it will automatically resize.
Notes
Don't add constraints for the width and height. Labels have an intrinsic size based on their text content.
Thanks to this answer for help with this.
No need to set sizeToFit when using auto layout. My complete code for the example project is here:
import UIKit
class ViewController: UIViewController {
#IBOutlet weak var myLabel: UILabel!
#IBAction func changeTextButtonTapped(sender: UIButton) {
myLabel.text = "my name is really long i want it to fit in this box"
}
}
If you want your label to line wrap then set the number of lines to 0 in IB and add myLabel.preferredMaxLayoutWidth = 150 // or whatever in code. (I also pinned my button to the bottom of the label so that it would move down when the label height increased.)
If you are looking for dynamically sizing labels inside a UITableViewCell then see this answer.
Use [label sizeToFit]; to adjust the text in UILabel
Here's what I am finding works for my situation:
1) The height of the UILabel has a >= 0 constraint using autolayout. The width is fixed.
2) Assign the text into the UILabel, which already has a superview at that point (not sure how vital that is).
3) Then, do:
label.sizeToFit()
label.layoutIfNeeded()
The height of the label is now set appropriately.
I created some methods based Daniel's reply above.
-(CGFloat)heightForLabel:(UILabel *)label withText:(NSString *)text
{
CGSize maximumLabelSize = CGSizeMake(290, FLT_MAX);
CGSize expectedLabelSize = [text sizeWithFont:label.font
constrainedToSize:maximumLabelSize
lineBreakMode:label.lineBreakMode];
return expectedLabelSize.height;
}
-(void)resizeHeightToFitForLabel:(UILabel *)label
{
CGRect newFrame = label.frame;
newFrame.size.height = [self heightForLabel:label withText:label.text];
label.frame = newFrame;
}
-(void)resizeHeightToFitForLabel:(UILabel *)label withText:(NSString *)text
{
label.text = text;
[self resizeHeightToFitForLabel:label];
}
#implementation UILabel (UILabel_Auto)
- (void)adjustHeight {
if (self.text == nil) {
self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, self.bounds.size.width, 0);
return;
}
CGSize aSize = self.bounds.size;
CGSize tmpSize = CGRectInfinite.size;
tmpSize.width = aSize.width;
tmpSize = [self.text sizeWithFont:self.font constrainedToSize:tmpSize];
self.frame = CGRectMake(self.frame.origin.x, self.frame.origin.y, aSize.width, tmpSize.height);
}
#end
This is category method. You must set text first, than call this method to adjust UILabel's height.
You can size your label according to text and other related controls using two ways-
For iOS 7.0 and above
CGSize labelTextSize = [labelText boundingRectWithSize:CGSizeMake(labelsWidth, MAXFLOAT)
options:NSStringDrawingUsesLineFragmentOrigin
attributes:#{
NSFontAttributeName : labelFont
}
context:nil].size;
before iOS 7.0 this could be used to calculate label size
CGSize labelTextSize = [label.text sizeWithFont:label.font
constrainedToSize:CGSizeMake(label.frame.size.width, MAXFLOAT)
lineBreakMode:NSLineBreakByWordWrapping];
// reframe other controls based on labelTextHeight
CGFloat labelTextHeight = labelTextSize.height;
If you do not want to calculate the size of the label's text than you can use -sizeToFit on the instance of UILabel as-
[label setNumberOfLines:0]; // for multiline label
[label setText:#"label text to set"];
[label sizeToFit];// call this to fit size of the label according to text
// after this you can get the label frame to reframe other related controls
Add missing constraints in storyboard.
Select UILabel in storyboard and set the attributes "Line" to 0.
Ref Outlet the UILabel to Controller.h with id:label
Controller.m and add [label sizeToFit]; in viewDidLoad
the sizeToFit() method doesn't play well with constraints, but as of iOS 9 this is all you need -
label.widthAnchor.constraint(equalToConstant: label.intrinsicContentSize.width).activate()
I had a huge problems with auto layout.
We have two containers inside table cell. Second container is resized depending on Item description (0 - 1000 chars), and row should be resized based on them.
The missing ingredient was bottom constraint for description.
I've changed bottom constraint of dynamic element from = 0 to >= 0.
Fits everytime! :)
name.text = #"Hi this the text I want to fit to"
UIFont * font = 14.0f;
CGSize size = [name.text sizeWithAttributes:#{NSFontAttributeName: font}];
nameOfAssessment.frame = CGRectMake(400, 0, size.width, 44);
nameOfAssessment.font = [UIFont systemFontOfSize:font];
you can show one line output then set property Line=0 and show multiple line output then set property Line=1 and more
[self.yourLableName sizeToFit];
There's also this approach:
[self.myLabel changeTextWithAutoHeight:self.myStringToAssignToLabel width:180.0f];