动态改变UILabel的字体大小

小开

最佳答案

一行:

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

上面的代码将调整你的文本的字体大小为(例如)8，试图使你的文本适合标签。

. numberOfLines = 1是必选项

多行:

对于numberOfLines > 1，有一个方法可以通过NSString sizeWithFont:……UIKit之外方法计算出最终文本的大小，例如:

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

之后，你可以使用结果lLabelSize来调整标签的大小，例如(假设你只会改变标签的高度):

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

iOS6

一行:

从iOS6开始，minimumFontSize已弃用。这条线

factLabel.minimumFontSize = 8.;

可更改为:

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

iOS7

多行:

从iOS7开始，sizeWithFont已弃用。多行大小写简化为:

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);

iOS 13 (Swift 5):

label.adjustsFontSizeToFitWidth = true
label.minimumScaleFactor = 0.5

小开

只需要发送sizeToFit消息到UITextView。它会调整自己的高度以适应文本。它不会改变自己的宽度或原点。

[textViewA1 sizeToFit];

小开

minimumFontSize在iOS 6中已弃用。你可以使用minimumScaleFactor。

yourLabel.adjustsFontSizeToFitWidth=YES;
yourLabel.minimumScaleFactor=0.5;

这将照顾你的字体大小根据标签和文本的宽度。

小开

它有点不复杂，但这应该工作，例如，假设你想将uilabel设置为120x120，最大字体大小为28:

magicLabel.numberOfLines = 0;
magicLabel.lineBreakMode = NSLineBreakByWordWrapping;
...
magicLabel.text = text;
for (int i = 28; i>3; i--) {
CGSize size = [text sizeWithFont:[UIFont systemFontOfSize:(CGFloat)i] constrainedToSize:CGSizeMake(120.0f, CGFLOAT_MAX) lineBreakMode:NSLineBreakByWordWrapping];
if (size.height < 120) {
magicLabel.font = [UIFont systemFontOfSize:(CGFloat)i];
break;
}
}

小开

根据@Eyal Ben Dov的回答，你可能想要创建一个类别，以便在你的其他应用中灵活使用。

奥林匹克广播服务公司。:我已经更新了他的代码，使其与iOS 7兼容

筒式水管文件

#import <UIKit/UIKit.h>


@interface UILabel (DynamicFontSize)


-(void) adjustFontSizeToFillItsContents;


@end

实现文件

#import "UILabel+DynamicFontSize.h"


@implementation UILabel (DynamicFontSize)


#define CATEGORY_DYNAMIC_FONT_SIZE_MAXIMUM_VALUE 35
#define CATEGORY_DYNAMIC_FONT_SIZE_MINIMUM_VALUE 3


-(void) adjustFontSizeToFillItsContents
{
NSString* text = self.text;


for (int i = CATEGORY_DYNAMIC_FONT_SIZE_MAXIMUM_VALUE; i>CATEGORY_DYNAMIC_FONT_SIZE_MINIMUM_VALUE; i--) {


UIFont *font = [UIFont fontWithName:self.font.fontName size:(CGFloat)i];
NSAttributedString *attributedText = [[NSAttributedString alloc] initWithString:text attributes:@{NSFontAttributeName: font}];


CGRect rectSize = [attributedText boundingRectWithSize:CGSizeMake(self.frame.size.width, CGFLOAT_MAX) options:NSStringDrawingUsesLineFragmentOrigin context:nil];


if (rectSize.size.height <= self.frame.size.height) {
self.font = [UIFont fontWithName:self.font.fontName size:(CGFloat)i];
break;
}
}


}


@end

使用

#import "UILabel+DynamicFontSize.h"


[myUILabel adjustFontSizeToFillItsContents];

干杯

小开

斯威夫特版本:

textLabel.adjustsFontSizeToFitWidth = true
textLabel.minimumScaleFactor = 0.5

小开

它是2015。我不得不去找一篇博客文章来解释如何在最新版本的iOS和XCode中使用Swift，这样它就可以与多行代码一起工作。

将“自动收缩”设置为“最小字体大小”。
将字体设置为理想的最大字体大小(我选择了20)
将“换行”从“换行”改为“截尾”。

< p >来源: http://beckyhansmeyer.com/2015/04/09/autoshrinking-text-in-a-multiline-uilabel/ < / p >

小开

这是一个快速扩展UILabel。它运行一个二进制搜索算法，根据标签边界的宽度和高度调整字体大小。测试工作与iOS 9和自动布局。

其中<label>是预定义的UILabel，需要调整字体大小

<label>.fitFontForSize()

默认情况下，该函数在5pt和300pt的字体大小范围内搜索，并将字体设置为“完全”适合其文本的范围(精确到1.0pt)。你可以定义参数，例如，它可以在1 pt和标签的当前字体大小之间精确地搜索0.1分，方法如下:

<label>.fitFontForSize(1.0, maxFontSize: <label>.font.pointSize, accuracy:0.1)

复制/粘贴以下代码到您的文件中

extension UILabel {


func fitFontForSize(var minFontSize : CGFloat = 5.0, var maxFontSize : CGFloat = 300.0, accuracy : CGFloat = 1.0) {
assert(maxFontSize > minFontSize)
layoutIfNeeded() // Can be removed at your own discretion
let constrainedSize = bounds.size
while maxFontSize - minFontSize > accuracy {
let midFontSize : CGFloat = ((minFontSize + maxFontSize) / 2)
font = font.fontWithSize(midFontSize)
sizeToFit()
let checkSize : CGSize = bounds.size
if  checkSize.height < constrainedSize.height && checkSize.width < constrainedSize.width {
minFontSize = midFontSize
} else {
maxFontSize = midFontSize
}
}
font = font.fontWithSize(minFontSize)
sizeToFit()
layoutIfNeeded() // Can be removed at your own discretion
}


}

注意:每个layoutIfNeeded()调用都可以自行删除

小开

Swift 2.0版本:

private func adapteSizeLabel(label: UILabel, sizeMax: CGFloat) {
label.numberOfLines = 0
label.lineBreakMode = NSLineBreakMode.ByWordWrapping
let maximumLabelSize = CGSizeMake(label.frame.size.width, sizeMax);
let expectSize = label.sizeThatFits(maximumLabelSize)
label.frame = CGRectMake(label.frame.origin.x, label.frame.origin.y, expectSize.width, expectSize.height)
}

小开

这个解决方案适用于多线:

在学习了几篇文章之后，我需要一个函数来自动缩放文本并调整行数以最适合给定的标签大小，于是我自己编写了一个函数。(即。短字符串可以很好地放在一行上，并使用大量的标签框架，而长字符串会自动分成2或3行，并相应地调整大小)

您可以自由地重新使用它并根据需要进行调整。确保在viewDidLayoutSubviews结束后调用它，这样初始标签帧就已经设置好了。

+ (void)setFontForLabel:(UILabel *)label withMaximumFontSize:(float)maxFontSize andMaximumLines:(int)maxLines {
int numLines = 1;
float fontSize = maxFontSize;
CGSize textSize; // The size of the text
CGSize frameSize; // The size of the frame of the label
CGSize unrestrictedFrameSize; // The size the text would be if it were not restricted by the label height
CGRect originalLabelFrame = label.frame;


frameSize = label.frame.size;
textSize = [label.text sizeWithAttributes:@{NSFontAttributeName:[UIFont systemFontOfSize: fontSize]}];


// Work out the number of lines that will need to fit the text in snug
while (((textSize.width / numLines) / (textSize.height * numLines) > frameSize.width / frameSize.height) && (numLines < maxLines)) {
numLines++;
}


label.numberOfLines = numLines;


// Get the current text size
label.font = [UIFont systemFontOfSize:fontSize];
textSize = [label.text boundingRectWithSize:CGSizeMake(frameSize.width, CGFLOAT_MAX)
options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes:@{NSFontAttributeName : label.font}
context:nil].size;


// Adjust the frame size so that it can fit text on more lines
// so that we do not end up with truncated text
label.frame = CGRectMake(label.frame.origin.x, label.frame.origin.y, label.frame.size.width, label.frame.size.width);


// Get the size of the text as it would fit into the extended label size
unrestrictedFrameSize = [label textRectForBounds:CGRectMake(0, 0, label.bounds.size.width, CGFLOAT_MAX) limitedToNumberOfLines:numLines].size;


// Keep reducing the font size until it fits
while (textSize.width > unrestrictedFrameSize.width || textSize.height > frameSize.height) {
fontSize--;
label.font = [UIFont systemFontOfSize:fontSize];
textSize = [label.text boundingRectWithSize:CGSizeMake(frameSize.width, CGFLOAT_MAX)
options:(NSStringDrawingUsesLineFragmentOrigin|NSStringDrawingUsesFontLeading)
attributes:@{NSFontAttributeName : label.font}
context:nil].size;
unrestrictedFrameSize = [label textRectForBounds:CGRectMake(0, 0, label.bounds.size.width, CGFLOAT_MAX) limitedToNumberOfLines:numLines].size;
}


// Set the label frame size back to original
label.frame = originalLabelFrame;
}

小开

下面是一个UILabel子类的填充代码，它实现了动画字体大小的改变:

@interface SNTextLayer : CATextLayer


@end


@implementation SNTextLayer


- (void)drawInContext:(CGContextRef)ctx {
// We override this to make text appear at the same vertical positon as in UILabel
// (otherwise it's shifted tdown)
CGFloat height = self.bounds.size.height;
float fontSize = self.fontSize;
// May need to adjust this somewhat if it's not aligned perfectly in your implementation
float yDiff = (height-fontSize)/2 - fontSize/10;


CGContextSaveGState(ctx);
CGContextTranslateCTM(ctx, 0.0, yDiff);
[super drawInContext:ctx];
CGContextRestoreGState(ctx);
}


@end


@interface SNAnimatableLabel ()


@property CATextLayer* textLayer;


@end


@interface SNAnimatableLabel : UILabel


- (void)animateFontToSize:(CGFloat)fontSize withDuration:(double)duration;


@end






@implementation SNAnimatableLabel




- (void)awakeFromNib {
[super awakeFromNib];
_textLayer = [SNTextLayer new];
_textLayer.backgroundColor = self.backgroundColor.CGColor;
_textLayer.foregroundColor = self.textColor.CGColor;
_textLayer.font = CGFontCreateWithFontName((CFStringRef)self.font.fontName);
_textLayer.frame = self.bounds;
_textLayer.string = self.text;
_textLayer.fontSize = self.font.pointSize;
_textLayer.contentsScale = [UIScreen mainScreen].scale;
[_textLayer setPosition: CGPointMake(CGRectGetMidX(_textLayer.frame), CGRectGetMidY(_textLayer.frame))];
[_textLayer setAnchorPoint: CGPointMake(0.5, 0.5)];
[_textLayer setAlignmentMode: kCAAlignmentCenter];
self.textColor = self.backgroundColor;
// Blend text with background, so that it doens't interfere with textlayer text
[self.layer addSublayer:_textLayer];
self.layer.masksToBounds = NO;
}


- (void)setText:(NSString *)text {
_textLayer.string = text;
super.text = text;
}


- (void)layoutSubviews {
[super layoutSubviews];
// Need to enlarge the frame, otherwise the text may get clipped for bigger font sizes
_textLayer.frame = CGRectInset(self.bounds, -5, -5);
}


- (void)animateFontToSize:(CGFloat)fontSize withDuration:(double)duration {
[CATransaction begin];
[CATransaction setAnimationDuration:duration];
_textLayer.fontSize = fontSize;
[CATransaction commit];
}

小开

一行-有两种方法，你可以简单地改变。

1- pragmatic (3)迅速

只需添加以下代码

    yourLabel.numberOfLines = 1;
yourLabel.minimumScaleFactor = 0.7;
yourLabel.adjustsFontSizeToFitWidth = true;

2 -使用UILabel属性检查器

i- Select your label- Set number of lines 1.
ii- Autoshrink-  Select Minimum Font Scale from drop down
iii- Set Minimum Font Scale value as you wish , I have set 0.7 as in below image. (default is 0.5)