是否有可能减少文本之间的差距,当把在一个UILabel多行?我们可以设置框架,字体大小和行数。我想减少标签中两行之间的差距。
当前回答
从接口生成器(Storyboard/XIB):
编程:
斯威夫特4
使用标签扩展
extension UILabel {
// Pass value for any one of both parameters and see result
func setLineSpacing(lineSpacing: CGFloat = 0.0, lineHeightMultiple: CGFloat = 0.0) {
guard let labelText = self.text else { return }
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = lineSpacing
paragraphStyle.lineHeightMultiple = lineHeightMultiple
let attributedString:NSMutableAttributedString
if let labelattributedText = self.attributedText {
attributedString = NSMutableAttributedString(attributedString: labelattributedText)
} else {
attributedString = NSMutableAttributedString(string: labelText)
}
// Line spacing attribute
attributedString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))
self.attributedText = attributedString
}
}
现在调用扩展函数
let label = UILabel()
let stringValue = "How to\ncontrol\nthe\nline spacing\nin UILabel"
// Pass value for any one argument - lineSpacing or lineHeightMultiple
label.setLineSpacing(lineSpacing: 2.0) . // try values 1.0 to 5.0
// or try lineHeightMultiple
//label.setLineSpacing(lineHeightMultiple = 2.0) // try values 0.5 to 2.0
或者使用标签实例(只要复制并执行这段代码就可以看到结果)
let label = UILabel()
let stringValue = "How to\ncontrol\nthe\nline spacing\nin UILabel"
let attrString = NSMutableAttributedString(string: stringValue)
var style = NSMutableParagraphStyle()
style.lineSpacing = 24 // change line spacing between paragraph like 36 or 48
style.minimumLineHeight = 20 // change line spacing between each line like 30 or 40
// Line spacing attribute
attrString.addAttribute(NSAttributedStringKey.paragraphStyle, value: style, range: NSRange(location: 0, length: stringValue.characters.count))
// Character spacing attribute
attrString.addAttribute(NSAttributedStringKey.kern, value: 2, range: NSMakeRange(0, attrString.length))
label.attributedText = attrString
斯威夫特3
let label = UILabel()
let stringValue = "How to\ncontrol\nthe\nline spacing\nin UILabel"
let attrString = NSMutableAttributedString(string: stringValue)
var style = NSMutableParagraphStyle()
style.lineSpacing = 24 // change line spacing between paragraph like 36 or 48
style.minimumLineHeight = 20 // change line spacing between each line like 30 or 40
attrString.addAttribute(NSParagraphStyleAttributeName, value: style, range: NSRange(location: 0, length: stringValue.characters.count))
label.attributedText = attrString
其他回答
根据@Mike的回答,减少lineHeightMultiple是关键点。下面的例子,它很适合我:
NSString* text = label.text;
CGFloat textWidth = [text sizeWithAttributes:@{NSFontAttributeName: label.font}].width;
if (textWidth > label.frame.size.width) {
NSMutableParagraphStyle *paragraph = [[NSMutableParagraphStyle alloc] init];
paragraph.alignment = NSTextAlignmentCenter;
paragraph.lineSpacing = 1.0f;
paragraph.lineHeightMultiple = 0.75; // Reduce this value !!!
NSMutableAttributedString* attrText = [[NSMutableAttributedString alloc] initWithString:text];
[attrText addAttribute:NSParagraphStyleAttributeName value:paragraph range:NSMakeRange(0, text.length)];
label.attributedText = attrText;
}
在Swift中,作为一个函数,灵感来自DarkDust
// Usage: setTextWithLineSpacing(myEpicUILabel,text:"Hello",lineSpacing:20)
func setTextWithLineSpacing(label:UILabel,text:String,lineSpacing:CGFloat)
{
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = lineSpacing
let attrString = NSMutableAttributedString(string: text)
attrString.addAttribute(NSAttributedString.Key.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
label.attributedText = attrString
}
我找到了一种方法,你可以设置真实的行高(不是一个因素),它甚至在界面生成器中渲染。按照下面的说明做就可以了。代码是用Swift 4编写的。
步骤#1:创建一个名为DesignableLabel.swift的文件,并插入以下代码:
import UIKit
@IBDesignable
class DesignableLabel: UILabel {
@IBInspectable var lineHeight: CGFloat = 20 {
didSet {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.minimumLineHeight = lineHeight
paragraphStyle.maximumLineHeight = lineHeight
paragraphStyle.alignment = self.textAlignment
let attrString = NSMutableAttributedString(string: text!)
attrString.addAttribute(NSAttributedStringKey.font, value: font, range: NSRange(location: 0, length: attrString.length))
attrString.addAttribute(NSAttributedStringKey.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: attrString.length))
attributedText = attrString
}
}
}
步骤#2:将UILabel放入Storyboard/XIB中,并将其类设置为DesignableLabel。等待项目构建完成(构建必须成功!)。
步骤3:现在你应该在属性窗格中看到一个名为“Line Height”的新属性。只需设置您喜欢的值,您应该立即看到结果!
我想在这个答案中加入一些新的东西,这样我就不会感觉那么糟糕了……以下是斯威夫特的回答:
import Cocoa
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 40
let attrString = NSMutableAttributedString(string: "Swift Answer")
attrString.addAttribute(.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
var tableViewCell = NSTableCellView()
tableViewCell.textField.attributedStringValue = attrString
简单的回答是:你不能。要改变文本行间的间距,你必须继承UILabel并滚动自己的drawTextInRect,或者创建多个标签。”
参见:设置UILabel行间距
这是一个非常老的答案,其他人已经添加了新的更好的方法来处理这个问题。请参阅下面提供的最新答案。
这应该会有帮助。然后你可以将你的标签分配给故事板中的这个自定义类,并直接在属性中使用它的参数:
open class SpacingLabel : UILabel {
@IBInspectable open var lineHeight:CGFloat = 1 {
didSet {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = self.lineHeight
paragraphStyle.alignment = self.textAlignment
let attrString = NSMutableAttributedString(string: self.text!)
attrString.addAttribute(NSAttributedStringKey.font, value: self.font, range: NSMakeRange(0, attrString.length))
attrString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
self.attributedText = attrString
}
}
}