如何根据文本长度计算UILabel宽度？

Question

我想在UILabel旁边显示一个图像,但是UILabel有可变的文本长度,所以我不知道在哪里放置图像.我怎么能做到这一点？

Answer 1

CGSize expectedLabelSize = [yourString sizeWithFont:yourLabel.font 
                        constrainedToSize:maximumLabelSize 
                        lineBreakMode:yourLabel.lineBreakMode]; 

什么是 - [NSString sizeWithFont:forWidth:lineBreakMode:]有用吗？

这个问题可能有你的答案,对我有用.

2014年,我在这个新版本中进行了编辑,基于Norbert的超便利评论!这做了一切.干杯

// yourLabel is your UILabel.

float widthIs = 
 [self.yourLabel.text
  boundingRectWithSize:self.yourLabel.frame.size                                           
  options:NSStringDrawingUsesLineFragmentOrigin
  attributes:@{ NSFontAttributeName:self.yourLabel.font }
  context:nil]
   .size.width;

NSLog(@"the width of yourLabel is %f", widthIs);

Answer 2

yourLabel.intrinsicContentSize.widthfor Objective-C/Swift

Answer 3

在迅速

 yourLabel.intrinsicContentSize().width 

Answer 4

iOS 6及更低版本的所选答案正确无误.

在iOS 7中,sizeWithFont:constrainedToSize:lineBreakMode:已被弃用.现在建议您使用boundingRectWithSize:options:attributes:context:.

CGRect expectedLabelSize = [yourString boundingRectWithSize:sizeOfRect
                                                    options:<NSStringDrawingOptions>
                                                 attributes:@{
                                                    NSFontAttributeName: yourString.font
                                                    AnyOtherAttributes: valuesForAttributes
                                                 }
                                                    context:(NSStringDrawingContext *)];

请注意,返回值CGRect不是a CGSize.希望这对在iOS 7中使用它的人有所帮助.

Answer 5

在iOS8中,sizeWithFont已被弃用,请参阅

CGSize yourLabelSize = [yourLabel.text sizeWithAttributes:@{NSFontAttributeName : [UIFont fontWithName:yourLabel.font size:yourLabel.fontSize]}];

您可以在sizeWithAttributes中添加所需的所有属性.您可以设置的其他属性:

- NSForegroundColorAttributeName
- NSParagraphStyleAttributeName
- NSBackgroundColorAttributeName
- NSShadowAttributeName

等等.但可能你不需要其他人

Answer 6

CGRect rect = label.frame;
rect.size = [label.text sizeWithAttributes:@{NSFontAttributeName : [UIFont fontWithName:label.font.fontName size:label.font.pointSize]}];
label.frame = rect;

Answer 7

Swift 4 Answer谁在使用约束

label.text = "Hello World"

var rect: CGRect = label.frame //get frame of label
rect.size = (label.text?.size(attributes: [NSFontAttributeName: UIFont(name: label.font.fontName , size: label.font.pointSize)!]))! //Calculate as per label font
labelWidth.constant = rect.width // set width to Constraint outlet

Swift 5 Answer正在使用约束

label.text = "Hello World"

var rect: CGRect = label.frame //get frame of label
rect.size = (label.text?.size(withAttributes: [NSAttributedString.Key.font: UIFont(name: label.font.fontName , size: label.font.pointSize)!]))! //Calculate as per label font
labelWidth.constant = rect.width // set width to Constraint outlet