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获得了许多不同的值。有的句子很多，有的只有5到6个单词。
我如何设置UILabel，使字体大小的变化，使文本总是适合我定义的界限?
当前回答
斯威夫特版本:
textLabel.adjustsFontSizeToFitWidth = true
textLabel.minimumScaleFactor = 0.5
其他回答
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(例如)8试图适合你的文本在标签。 numberolines = 1是必选项。
多行:
对于numberolines > 1，有一个方法可以通过NSString的sizeWithFont来计算最终文本的大小:…UIKit添加方法，例如:
CGSize lLabelSize = [yourText sizeWithFont:factLabel.font
forWidth:factLabel.frame.size.width
lineBreakMode:factLabel.lineBreakMode];
之后，你可以使用产生的lLabelSize来调整你的标签大小，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不再使用。 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
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)
}
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];
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”。
来源: http://beckyhansmeyer.com/2015/04/09/autoshrinking-text-in-a-multiline-uilabel/
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];
}
