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 = @"some text some text some text some text";
factLabel.backgroundColor = [UIColor clearColor];
factLabel.lineBreakMode = UILineBreakModeWordWrap;
factLabel.numberOfLines = 10;
[self.view addSubview:factLabel];

在我的 iOS 应用程序的整个生命周期中，factLabel 获得了一堆不同的值.有些有多个句子，有些只有 5 或 6 个词.

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.

如何设置 UILabel 以便改变字体大小，使文本始终适合我定义的边界?

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

推荐答案

单行:

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

上面的代码会将您的文本的字体大小调整为(例如)8 以尝试使您的文本适合标签.numberOfLines = 1 是强制性的.

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.

多行:

对于 numberOfLines >1 有一种方法可以通过 NSString 来计算最终文本的大小sizeWithFont:... UIKit添加方法，例如:

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

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

之后，您可以使用生成的 lLabelSize 调整标签大小，例如(假设您将仅更改标签的高度):

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

单行:

从 iOS6 开始，minimumFontSize 已被弃用.线

Starting with iOS6, minimumFontSize has been deprecated. The line

factLabel.minimumFontSize = 8.;

可以改为:

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

iOS7

多行:

从 iOS7 开始，sizeWithFont 被弃用.多行情况简化为:

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);

iOS 13 (Swift 5):

label.adjustsFontSizeToFitWidth = true
label.minimumScaleFactor = 0.5

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