在UILabel 中放入多行时，是否可以减少文本之间的间隙？我们可以设置框架、字体大小和行数。我想缩小该标签中两行之间的差距。
【问题讨论】：
UILabel，然后将所有标签嵌入StackView。最后调整StackView的spacing。记得垂直堆叠。
标签： objective-c swift xcode uilabel line-spacing
在 Xcode 6 中，您可以在情节提要中执行此操作：
【讨论】：
我想在这个答案中添加一些新的东西，所以我感觉没有那么糟糕......这是一个 Swift 答案：
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
“简短的回答：你不能。要更改文本行之间的间距，你必须继承 UILabel 并滚动你自己的 drawTextInRect，或者创建多个标签。”
这是一个非常古老的答案，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。
【讨论】：
NSAttributedString来控制它（也可以在Xcode的界面构建器的UILable的属性中使用）。
NSAttributedString 时不能通过NSParagraphStyle 减少它。 （我可能需要对其他可修改属性进行更多测试，但lineSpacing 属性只允许您增加它。）
从 iOS 6 开始，您可以为 UILabel 设置属性字符串。检查以下内容：
NSMutableAttributedString *attributedString = [[NSMutableAttributedString alloc] initWithString:label.text];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineSpacing = spacing;
[attributedString addAttribute:NSParagraphStyleAttributeName value:paragraphStyle range:NSMakeRange(0, label.text.length)];
label.attributedText = attributedString;
【讨论】：
attributedString 必须是 NSMutableAttributedString（不是 NSAttributedString）
NSMutableAttributedString *attributedString = [NSMutableAttributedString alloc]initWithString:@"sample text"];
NSMutableParagraphStyle 的lineSpacing 属性永远不会是负数，因此无法使用这种方法降低行高。要回答这个问题，您必须使用另一个属性，请参阅@d.ennis 答案。
此处所述的解决方案对我不起作用。我发现使用 iOS 6 NSAttributeString 的方法略有不同：
myLabel.numberOfLines = 0;
NSString* string = @"String with line one. \n Line two. \n Line three.";
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
style.minimumLineHeight = 30.f;
style.maximumLineHeight = 30.f;
NSDictionary *attributtes = @{NSParagraphStyleAttributeName : style,};
myLabel.attributedText = [[NSAttributedString alloc] initWithString:string
attributes:attributtes];
[myLabel sizeToFit];
【讨论】：
来自 Interface Builder（Storyboard/XIB）：
以编程方式：
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
}
}
现在调用分机功能
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 = "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
【讨论】：
我制作了这个简单的扩展，非常适合我：
extension UILabel {
func setLineHeight(lineHeight: CGFloat) {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = lineHeight
paragraphStyle.alignment = self.textAlignment
let attrString = NSMutableAttributedString()
if (self.attributedText != nil) {
attrString.append( self.attributedText!)
} else {
attrString.append( 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
}
}
把它复制到一个文件中，这样你就可以像这样使用它了
myLabel.setLineHeight(0.7)
【讨论】：
lineSpacing而忘记设置lineHeightMultiple？
.lineSpacing = 1.4 而忘记所有关于.lineHeightMultiple...
现在在 iOS 6 中有一个替代答案，即在标签上设置属性文本，使用具有适当段落样式的 NSAttributedString。有关使用 NSAttributedString 的行高的详细信息，请参阅此堆栈溢出答案：
【讨论】：
这是一个继承 UILabel 以具有 line-height 属性的类：https://github.com/LemonCake/MSLabel
【讨论】：
在 Swift 中作为函数，受 DarkDust 启发
// 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
}
【讨论】：
根据@Mike 的回答，减少lineHeightMultiple 是关键点。下面的例子，它对我很有效：
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;
}
【讨论】：
SWIFT 3 用于更轻松地设置行间距的有用扩展 :)
extension UILabel
{
func setLineHeight(lineHeight: CGFloat)
{
let text = self.text
if let text = text
{
let attributeString = NSMutableAttributedString(string: text)
let style = NSMutableParagraphStyle()
style.lineSpacing = lineHeight
attributeString.addAttribute(NSParagraphStyleAttributeName,
value: style,
range: NSMakeRange(0, text.characters.count))
self.attributedText = attributeString
}
}
}
【讨论】：
我找到了一种方法，您可以设置实际行高（不是一个因素），它甚至可以在界面生成器中实时呈现。只需按照以下说明进行操作。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 并将其类设置为DesignableLabel。等待您的项目构建（构建必须成功！）。
第 3 步：现在您应该会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！
【讨论】：
这是 UILabel 的一个子类，它设置 lineHeightMultiple 并确保固有高度足够大而不会截断文本。
@IBDesignable
class Label: UILabel {
override var intrinsicContentSize: CGSize {
var size = super.intrinsicContentSize
let padding = (1.0 - lineHeightMultiple) * font.pointSize
size.height += padding
return size
}
override var text: String? {
didSet {
updateAttributedText()
}
}
@IBInspectable var lineHeightMultiple: CGFloat = 1.0 {
didSet {
updateAttributedText()
}
}
private func updateAttributedText() {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineHeightMultiple = lineHeightMultiple
attributedText = NSAttributedString(string: text ?? "", attributes: [
.font: font,
.paragraphStyle: paragraphStyle,
.foregroundColor: textColor
])
invalidateIntrinsicContentSize()
}
}
【讨论】：
在 Swift 2.0 中...
添加扩展：
extension UIView {
func attributesWithLineHeight(font: String, color: UIColor, fontSize: CGFloat, kern: Double, lineHeightMultiple: CGFloat) -> [String: NSObject] {
let titleParagraphStyle = NSMutableParagraphStyle()
titleParagraphStyle.lineHeightMultiple = lineHeightMultiple
let attribute = [
NSForegroundColorAttributeName: color,
NSKernAttributeName: kern,
NSFontAttributeName : UIFont(name: font, size: fontSize)!,
NSParagraphStyleAttributeName: titleParagraphStyle
]
return attribute
}
}
现在，只需将您的 UILabel 设置为属性文本：
self.label.attributedText = NSMutableAttributedString(string: "SwiftExample", attributes: attributesWithLineHeight("SourceSans-Regular", color: UIColor.whiteColor(), fontSize: 20, kern: 2.0, lineHeightMultiple: 0.5))
显然，我添加了一堆您可能不需要的参数。玩转——随意重写方法——我在一堆不同的答案上寻找这个，所以我想我会发布整个扩展，以防它帮助那里的人......-rab
【讨论】：
Swift3 - 在 UITextView 或 UILabel 扩展中，添加这个函数：
如果您已经在视图中使用属性字符串（而不是覆盖它们），我添加了一些代码来保留当前属性文本。
func setLineHeight(_ lineHeight: CGFloat) {
guard let text = self.text, let font = self.font else { return }
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = lineHeight
paragraphStyle.alignment = self.textAlignment
var attrString:NSMutableAttributedString
if let attributed = self.attributedText {
attrString = NSMutableAttributedString(attributedString: attributed)
} else {
attrString = NSMutableAttributedString(string: text)
attrString.addAttribute(NSFontAttributeName, value: font, range: NSMakeRange(0, attrString.length))
}
attrString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, attrString.length))
self.attributedText = attrString
}
【讨论】：
另一个答案...如果您以编程方式传递字符串，则需要传递属性字符串而不是常规字符串并更改其样式。（iOS10）
NSMutableAttributedString * attrString = [[NSMutableAttributedString alloc] initWithString:@"Your \nregular \nstring"];
NSMutableParagraphStyle *style = [[NSMutableParagraphStyle alloc] init];
[style setLineSpacing:4];
[attrString addAttribute:NSParagraphStyleAttributeName
value:style
range:NSMakeRange(0, attrString.length)];
_label.attributedText = attrString;
【讨论】：
这应该会有所帮助。然后，您可以将标签分配给情节提要中的这个自定义类，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
}
}
}
【讨论】：
Swift 4 标签扩展。在传递给函数之前创建 NSMutableAttributedString，以防属性文本需要额外的属性。
extension UILabel {
func setLineHeightMultiple(to height: CGFloat, withAttributedText attributedText: NSMutableAttributedString) {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = 1.0
paragraphStyle.lineHeightMultiple = height
paragraphStyle.alignment = textAlignment
attributedText.addAttribute(.paragraphStyle, value: paragraphStyle, range: NSRange(location: 0, length: attributedText.length - 1))
self.attributedText = attributedText
}
}
【讨论】：
Swift 3 扩展：
import UIKit
extension UILabel {
func setTextWithLineSpacing(text: String, lineHeightMultiply: CGFloat = 1.3) {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineHeightMultiple = lineHeightMultiply
paragraphStyle.alignment = .center
let attributedString = NSMutableAttributedString(string: text)
attributedString.addAttribute(NSParagraphStyleAttributeName, value: paragraphStyle, range: NSRange(location: 0, length: attributedString.length))
self.attributedText = attributedString
}
}
【讨论】：
这段代码对我有用（肯定是 ios 7 和 ios 8）。
_label.numberOfLines=2;
_label.textColor=[UIColor whiteColor];
NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];
paragraphStyle.lineHeightMultiple=0.5;
paragraphStyle.alignment = NSTextAlignmentCenter;
paragraphStyle.lineSpacing = 1.0;
NSDictionary *nameAttributes=@{
NSParagraphStyleAttributeName : paragraphStyle,
NSBaselineOffsetAttributeName:@2.0
};
NSAttributedString *string=[[NSAttributedString alloc] initWithString:@"22m\nago" attributes:nameAttributes];
_label.attributedText=string;
【讨论】：
这是我的快速解决方案。子类应该适用于属性文本和文本属性以及 characterSpacing + lineSpacing。如果设置了新字符串或属性字符串，它会保留间距。
open class UHBCustomLabel : UILabel {
@IBInspectable open var characterSpacing:CGFloat = 1 {
didSet {
updateWithSpacing()
}
}
@IBInspectable open var lines_spacing:CGFloat = -1 {
didSet {
updateWithSpacing()
}
}
open override var text: String? {
set {
super.text = newValue
updateWithSpacing()
}
get {
return super.text
}
}
open override var attributedText: NSAttributedString? {
set {
super.attributedText = newValue
updateWithSpacing()
}
get {
return super.attributedText
}
}
func updateWithSpacing() {
let attributedString = self.attributedText == nil ? NSMutableAttributedString(string: self.text ?? "") : NSMutableAttributedString(attributedString: attributedText!)
attributedString.addAttribute(NSKernAttributeName, value: self.characterSpacing, range: NSRange(location: 0, length: attributedString.length))
if lines_spacing >= 0 {
let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.lineSpacing = lines_spacing
paragraphStyle.alignment = textAlignment
attributedString.addAttribute(NSParagraphStyleAttributeName, value:paragraphStyle, range:NSMakeRange(0, attributedString.length))
}
super.attributedText = attributedString
}
}
【讨论】：