如何在Swift中的UILabel中增加行距

94

我有一个文本行很少的标签，我想增加行间距。其他人也有类似的问题，但是解决方案不能解决我的问题。另外，我的标签可能包含也可能不包含段落。我是新来的Swift。有使用情节提要的解决方案吗？还是只能通过NSAttributedString其可能？

ios  swift  uilabel  line-spacing 
— 斯内哈
source

Answers:

175

UILabel使用以下代码段将LineSpacing编程添加到您的代码中。

早期的Swift版本

let attributedString = NSMutableAttributedString(string: "Your text")

// *** Create instance of `NSMutableParagraphStyle`
let paragraphStyle = NSMutableParagraphStyle()

// *** set LineSpacing property in points ***
paragraphStyle.lineSpacing = 2 // Whatever line spacing you want in points

// *** Apply attribute to string ***
attributedString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))

// *** Set Attributed String to your label ***
label.attributedText = attributedString

迅捷4.0

let attributedString = NSMutableAttributedString(string: "Your text")

// *** Create instance of `NSMutableParagraphStyle`
let paragraphStyle = NSMutableParagraphStyle()

// *** set LineSpacing property in points ***
paragraphStyle.lineSpacing = 2 // Whatever line spacing you want in points

// *** Apply attribute to string ***
attributedString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))

// *** Set Attributed String to your label ***
label.attributedText = attributedString

斯威夫特4.2

let attributedString = NSMutableAttributedString(string: "Your text")

// *** Create instance of `NSMutableParagraphStyle`
let paragraphStyle = NSMutableParagraphStyle()

// *** set LineSpacing property in points ***
paragraphStyle.lineSpacing = 2 // Whatever line spacing you want in points

// *** Apply attribute to string ***
attributedString.addAttribute(NSAttributedString.Key.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))

// *** Set Attributed String to your label ***
label.attributedText = attributedString
— 迪彭·潘查萨拉（Dipen Panchasara）
source
3
这显示了错误“类型为'NSAttributedString'的值没有成员'addAttribute'的错误”。
— Sneha
2
我们需要使用NSMutableAttributedString代替NSAttributedString。我已经更新了。
— Dipen Panchasara
1
使用自定义字体也很棒@ Dipen Panchasara
— Abdul Karim
7
我不知道为什么，但就我而言，这仅在您将linepacing设置为> = 1时有效，而我尝试将其设置为0.5 / 0.75，则没有效果
— Aximem
2
不需要NSMutableAttributedString。可以使用NSAttributedString(string: "Your text", attributes: [NSAttributedString.Key.paragraphStyle : paragraphStyle])
— bauerMusic
101

从Interface Builder：

在此处输入图片说明

以编程方式：

迅捷4和4.2

使用标签扩展名

extension UILabel {

    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)
        }

        // (Swift 4.2 and above) Line spacing attribute
        attributedString.addAttribute(NSAttributedString.Key.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))


        // (Swift 4.1 and 4.0) Line spacing attribute
        attributedString.addAttribute(NSAttributedStringKey.paragraphStyle, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))

        self.attributedText = attributedString
    }
}

现在调用分机功能

let label = UILabel()
let stringValue = "Set\nUILabel\nline\nspacing"

// 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

或使用标签实例（只需复制并执行此代码即可查看结果）

let label = UILabel()
let stringValue = "Set\nUILabel\nline\nspacing"
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

迅捷3

let label = UILabel()
let stringValue = "Set\nUILabel\nline\nspacing"
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
— 克鲁纳尔
source
“ NSAttributedStringKey.paragraphStyle”出错，我改用“ NSParagraphStyleAttributeName”。
— Ahmadreza
@Alfi-这是Swift语言版本的区别。您项目的敏捷语言。版本可能会很快3.x，这是这两个版本的答案。尝试使用Swift 3代码。
— 克鲁纳尔18'Feb
Hii @krunal，我已经在Interface中设置了Linespacing和LineHeight，并且以编程方式在UILabel中设置了文本，但是它不起作用。如果我在“界面”中添加文字，则可以正常工作。您能为此帮我吗，谢谢，我也在UILabel中设置了attributedText和text，但是这种方法对我不起作用。
— Yogesh Patel
接口构建器解决方案仅适用于静态文本。当我们在代码中添加属性字符串时，不会应用从接口构建器添加的那些属性。
— Yodagama
66

您可以在中控制行距storyboard。

在此处输入图片说明

同样的问题。

— pkc456
source
8
我实际上试过了。但是它不起作用。这对于自定义字体也没有用。
— Sneha
如果您遇到自定义字体未对齐的情况，请尝试ascender按此处所述更新属性。
— pkc456 '16
1
它不是未对准问题。我无法使用您说的解决方案选择我的自定义字体@ pkc456
— Sneha，
它不是未对准问题。我无法选择我的自定义字体。但是现在，我通过在Attributed中单独通过设置添加字体来解决了这一问题。但是间距仍然保持不变。@ pkc456
— Sneha
15
这仅适用于静态文本。尝试以编程方式添加文本。这行不通。
— Sneha
11

Swift 5.0的最新解决方案

private extension UILabel {

    // MARK: - spacingValue is spacing that you need
    func addInterlineSpacing(spacingValue: CGFloat = 2) {

        // MARK: - Check if there's any text
        guard let textString = text else { return }

        // MARK: - Create "NSMutableAttributedString" with your text
        let attributedString = NSMutableAttributedString(string: textString)

        // MARK: - Create instance of "NSMutableParagraphStyle"
        let paragraphStyle = NSMutableParagraphStyle()

        // MARK: - Actually adding spacing we need to ParagraphStyle
        paragraphStyle.lineSpacing = spacingValue

        // MARK: - Adding ParagraphStyle to your attributed String
        attributedString.addAttribute(
            .paragraphStyle,
            value: paragraphStyle,
            range: NSRange(location: 0, length: attributedString.length
        ))

        // MARK: - Assign string that you've modified to current attributed Text
        attributedText = attributedString
    }

}

以及用法：

let yourLabel = UILabel()
let yourText = "Hello \n world \n !"
yourLabel.text = yourText
yourLabel.addInterlineSpacing(spacingValue: 1.5)
— 亚历山大·尼科连科
source
当然，这仅在您使用UILabel.text而不使用的情况下才有效UILabel.attributedText
— JeroenJK
9

您可以使用以下可重用的扩展名：

extension String {

func lineSpaced(_ spacing: CGFloat) -> NSAttributedString {
    let paragraphStyle = NSMutableParagraphStyle()
    paragraphStyle.lineSpacing = spacing
    let attributedString = NSAttributedString(string: self, attributes: [NSAttributedString.Key.paragraphStyle: paragraphStyle])
    return attributedString
}
}
— 霍萨姆·加里卜（Hossam Ghareeb）
source
5

Swift 4和Swift 5

extension NSAttributedString {
    func withLineSpacing(_ spacing: CGFloat) -> NSAttributedString {


        let attributedString = NSMutableAttributedString(attributedString: self)
        let paragraphStyle = NSMutableParagraphStyle()
        paragraphStyle.lineBreakMode = .byTruncatingTail
        paragraphStyle.lineSpacing = spacing
        attributedString.addAttribute(.paragraphStyle,
                                      value: paragraphStyle,
                                      range: NSRange(location: 0, length: string.count))
        return NSAttributedString(attributedString: attributedString)
    }
}

如何使用

    let example = NSAttributedString(string: "This is Line 1 \nLine 2 \nLine 3 ").withLineSpacing(15)
    testLabel.attributedText = example

例

— 拉希德·拉蒂夫（Rashid Latif）
source
太棒了！节省了我的时间！
— Codetard
4

迪彭的答案针对Swift 4进行了更新

let attr = NSMutableAttributedString(string: today)
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 2
attr.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSMakeRange(0, attr.length))
label.attributedText = attr;
— 迈克·卡彭特
source
1 
//Swift 4:
    func set(text:String,
                         inLabel:UILabel,
                         withLineSpacing:CGFloat,
                         alignment:NSTextAlignment){
            let paragraphStyle = NSMutableParagraphStyle()
            paragraphStyle.lineSpacing = withLineSpacing
            let attrString = NSMutableAttributedString(string: text)
            attrString.addAttribute(NSAttributedStringKey.paragraphStyle,
                                    value:paragraphStyle,
                                    range:NSMakeRange(0, attrString.length))
            inLabel.attributedText = attrString
            inLabel.textAlignment = alignment
          }
— Venu Gopal Tewari
source
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