How to adjust a label size to fit the length of the text
I have searched the solution to this in the past QAs, but could not find the right one.
Does anyone know how to adjust a UILabel
size dynamically to fit the text length?
I have uploaded the screen shot of what I don't want(1st line) and what I want(2nd line).
I'd appreciate any clues, advice or code sample. Thank you.
What you are searching is the UILabel method sizeToFit
I can try to explain to you, but the best answer to know how to work with UILabel is that: https://stackoverflow.com/a/1054681/666479
Xcode 8 and iOS 10
This is quite easy to do with Auto Layout. No need to do anything in code.
Use Auto Layout
Use auto layout to pin each label's top and left edges only. Don't add constraints for the width and height. The view's intrinsic content size will take care of that.
Here is what the constraints look like:
Code
There is nothing at all special about the code. No need to use sizeToFit
or anything like that.
import UIKit
class ViewController: UIViewController {
@IBOutlet weak var labelOne: UILabel!
@IBOutlet weak var labelTwo: UILabel!
@IBOutlet weak var labelThree: UILabel!
@IBAction func changeTextButtonTapped(_ sender: UIButton) {
labelOne.text = "David"
labelTwo.text = "met"
labelThree.text = "her"
}
}
Notes
Use This Extended UILabel
class:
//
// UILabelExtended.h
//
// Created by Prateek on 6/18/11.
#import <Foundation/Foundation.h>
/* **********************************************************************************************
This class inherit the class UILabel and extend the features of UILabel.
********************************************************************************************** */
@interface UILabelExtended : UILabel {
__unsafe_unretained id customDelegate;
id objectInfo;
SEL selector;
}
@property (nonatomic,assign) SEL selector;;
@property (nonatomic,assign) id customDelegate;
@property (nonatomic,retain) id objectInfo;
@end
@interface UILabel(UILabelCategory)
- (void)setHeightOfLabel;
- (void)setWidthOfLabel;
- (void)setHeightOfLabelWithMaxHeight:(float)maxHeight;
- (void)setWidthOfLabelWithMaxWidth:(float)maxWidth ;
@end
UILabelExtended.m
//
// Created by Prateek on 6/18/11.
//
#import "UILabelExtended.h"
@implementation UILabelExtended
@synthesize selector,customDelegate, objectInfo;
- (void) touchesBegan:(NSSet *)touches withEvent:(UIEvent *)event {
if(self.selector)
if([self.customDelegate respondsToSelector:self.selector]) {
[self.customDelegate performSelector:self.selector withObject:self];
return;
}
}
- (void)dealloc {
self.customDelegate = nil;
self.selector = NULL;
self.objectInfo = nil;
}
@end
@implementation UILabel(UILabelCategory)
- (void)setHeightOfLabel {
UILabel* label = self;
//get the height of label content
CGFloat height = [label.text sizeWithFont:label.font constrainedToSize:CGSizeMake(label.bounds.size.width, 99999) lineBreakMode:NSLineBreakByWordWrapping].height;
//set the frame according to calculated height
CGRect frame = label.frame;
if([label.text length] > 0) {
frame.size.height = height;
}
else {
frame.size.height = 0;
}
label.frame = frame;
}
- (void)setWidthOfLabel {
UILabel* label = self;
//get the height of label content
CGFloat width = [label.text sizeWithFont:label.font constrainedToSize:CGSizeMake(99999, label.bounds.size.height) lineBreakMode:NSLineBreakByWordWrapping].width;
//set the frame according to calculated height
CGRect frame = label.frame;
if([label.text length] > 0) {
frame.size.width = width+5;
}
else {
frame.size.width = 0;
}
label.frame = frame;
}
- (void)setHeightOfLabelWithMaxHeight:(float)maxHeight {
UILabel* label = self;
//get the height of label content
CGFloat height = [label.text sizeWithFont:label.font constrainedToSize:CGSizeMake(label.bounds.size.width, maxHeight) lineBreakMode:NSLineBreakByWordWrapping].height;
//set the frame according to calculated height
CGRect frame = label.frame;
if([label.text length] > 0) {
if (height > maxHeight) {
frame.size.height = maxHeight;
}
else {
frame.size.height = height;
}
}
else {
frame.size.height = 0;
}
label.frame = frame;
}
- (void)setWidthOfLabelWithMaxWidth:(float)maxWidth {
UILabel* label = self;
//get the height of label content
CGFloat width = [label.text sizeWithFont:label.font constrainedToSize:CGSizeMake(99999, label.bounds.size.height) lineBreakMode:NSLineBreakByWordWrapping].width;
//set the frame according to calculated height
CGRect frame = label.frame;
if([label.text length] > 0) {
if (width > maxWidth) {
frame.size.width = maxWidth;
}
else {
frame.size.width = width;
}
}
else {
frame.size.width = 0;
}
label.frame = frame;
}
@end
Use Methods: 1) set text of UILabel
2) [yourLBLObj setHeightOfLabel];
or [yourLBLObj setWidthOfLabel];
It will automatically set Height or Width according to text.
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