动态改变UILabel的字体大小 [英] Dynamically changing font size of UILabel

问题描述

我目前有一个 UILabel ：

  factLabel = [[ UILabel alloc] initWithFrame：CGRectMake（20，100，280，100）]; 
 factLabel.text = @一些文字一些文字一些文字一些文字; 
 factLabel.backgroundColor = [UIColor clearColor]; 
 factLabel.lineBreakMode = UILineBreakModeWordWrap; 
 factLabel.numberOfLines = 10; 
 [self.view addSubview：factLabel]; 
  

在iOS应用程序的整个生命周期中， factLabel 得到一堆不同的值。有些有多个句子，有的只有5或6个单词。

如何设置 UILabel 以便字体大小发生变化，以便文本始终适合边界我定义了？

解决方案

单行：

  factLabel.numberOfLines = 1; 
 factLabel.minimumFontSize = 8; 
 factLabel.adjustsFontSizeToFitWidth = YES; 
  

上面的代码会将文本的字体大小调整为（例如） 8 试图使你的文字符合标签。
numberOfLines = 1 是强制性的。

多行：

对于 numberOfLines> 1 有一个方法可以通过

  CGSize lLabelSize = [yourText sizeWithFont：factLabel.font forWidth：factLabel.frame.size.width lineBreakMode：factLabel.lineBreakMode]; 
  

之后，您可以使用结果 lLabelSize


  factLabel.frame = CGRectMake（factLabel.frame .origin.x，factLabel.frame.origin.y，factLabel.frame.size.width，lLabelSize.height）; 
  

iOS6

<单行：

从iOS6开始， minimumFontSize 已被弃用。该行

  factLabel.minimumFontSize = 8。 
  

可以更改为：

  factLabel.minimumScaleFactor = 8./factLabel.font.pointSize; 
  

iOS7

<多行：

从iOS7开始，不推荐使用 sizeWithFont 。
多行情况简化为：

  factLabel.numberOfLines = 0; 
 factLabel.lineBreakMode = NSLineBreakByWordWrapping; 
 CGSize maximumLabelSize = CGSizeMake（factLabel.frame.size.width，CGFLOAT_MAX）; 
 CGSize expectSize = [factLabel sizeThatFits：maximumLabelSize]; 
 factLabel.frame = CGRectMake（factLabel.frame.origin.x，factLabel.frame.origin.y，expectSize.width，expectSize.height）; 
  

I currently have a UILabel:

factLabel = [[UILabel alloc] initWithFrame:CGRectMake(20, 100, 280, 100)];
factLabel.text = @"some text some text some text some text";
factLabel.backgroundColor = [UIColor clearColor];
factLabel.lineBreakMode = UILineBreakModeWordWrap;
factLabel.numberOfLines = 10;
[self.view addSubview:factLabel];

Throughout the life of my iOS application, factLabel gets a bunch of different values. Some with multiple sentences, others with just 5 or 6 words.

How can I set up the UILabel so that the font size changes so that the text always fits in the bounds I defined?

解决方案

Single line:

factLabel.numberOfLines = 1;
factLabel.minimumFontSize = 8;
factLabel.adjustsFontSizeToFitWidth = YES;

The above code will adjust your text's font size down to (for example) 8 trying to fit your text within the label. numberOfLines = 1 is mandatory.

Multiple lines:

For numberOfLines > 1 there is a method to figure out the size of final text through NSString's UIKit addition methods, for example:

CGSize lLabelSize = [yourText sizeWithFont: factLabel.font forWidth:factLabel.frame.size.width lineBreakMode:factLabel.lineBreakMode];

After that you can just resize your label using resulting lLabelSize, for example (assuming that you will change only label's height):

factLabel.frame = CGRectMake(factLabel.frame.origin.x, factLabel.frame.origin.y, factLabel.frame.size.width, lLabelSize.height);

iOS6

Single line:

Starting with iOS6, minimumFontSize has been deprecated. The line

factLabel.minimumFontSize = 8.;

can be changed to:

factLabel.minimumScaleFactor = 8./factLabel.font.pointSize;

iOS7

Multiple lines:

Starting with iOS7, sizeWithFont becomes deprecated. Multiline case is reduced to:

factLabel.numberOfLines = 0;
factLabel.lineBreakMode = NSLineBreakByWordWrapping;
CGSize maximumLabelSize = CGSizeMake(factLabel.frame.size.width, CGFLOAT_MAX);
CGSize expectSize = [factLabel sizeThatFits:maximumLabelSize];
factLabel.frame = CGRectMake(factLabel.frame.origin.x, factLabel.frame.origin.y, expectSize.width, expectSize.height);

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