我UILabel要在顶部和底部添加空间。在最小高度限制下，我将其修改为：

编辑：为此，我使用了：

  override func drawTextInRect(rect: CGRect) {
        var insets: UIEdgeInsets = UIEdgeInsets(top: 0.0, left: 10.0, bottom: 0.0, right: 10.0)
        super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))

    } 

但是我必须找到一种不同的方法，因为如果我写了两行以上，问题是一样的：

如果您想坚持使用UILabel而不对其进行子类化，则Mundi为您提供了明确的解决方案。

或者，如果您愿意避免用UIView包裹UILabel，则可以使用UITextView启用UIEdgeInsets（填充）或UILabel子类的使用以支持UIEdgeInsets。

使用UITextView仅需要提供插图（OBJ-C）：

textView.textContainerInset = UIEdgeInsetsMake(10, 0, 10, 0);

或者，如果您将UILabel子类化，则此方法的一个示例将是重写drawTextInRect方法
（OBJ-C）

- (void)drawTextInRect:(CGRect)uiLabelRect {
    UIEdgeInsets myLabelInsets = {10, 0, 10, 0};
    [super drawTextInRect:UIEdgeInsetsInsetRect(uiLabelRect, myLabelInsets)];
}

您还可以为新的子类UILabel提供用于TOP，LEFT，BOTTOM和RIGHT的插入变量。

示例代码可能是：

在.h（OBJ-C）中

float topInset, leftInset,bottomInset, rightInset;

以.m（OBJ-C）

- (void)drawTextInRect:(CGRect)uiLabelRect {
    [super drawTextInRect:UIEdgeInsetsInsetRect(uiLabelRect, UIEdgeInsetsMake(topInset,leftInset,bottomInset,rightInset))];
}

编辑＃1：

从我所看到的情况来看，子类化时似乎必须重写UILabel的internalContentSize。

因此，您应该像下面那样覆盖internalContentSize：

- (CGSize) intrinsicContentSize {
    CGSize intrinsicSuperViewContentSize = [super intrinsicContentSize] ;
    intrinsicSuperViewContentSize.height += topInset + bottomInset ;
    intrinsicSuperViewContentSize.width += leftInset + rightInset ;
    return intrinsicSuperViewContentSize ;
}

并添加以下方法来编辑插图，而不是单独编辑它们：

- (void) setContentEdgeInsets:(UIEdgeInsets)edgeInsets {
    topInset = edgeInsets.top;
    leftInset = edgeInsets.left;
    rightInset = edgeInsets.right; 
    bottomInset = edgeInsets.bottom;
    [self invalidateIntrinsicContentSize] ;
}

它将更新UILabel的大小以匹配边缘插图，并覆盖您引用的多行必要性。

编辑＃2

经过一番搜索后，我发现了带有IPInsetLabel的Gist。如果这些解决方案均无效，则可以尝试一下。

编辑＃3

关于此事，存在类似的问题（重复）。
有关可用解决方案的完整列表，请参见以下答案：UILabel文本边距

我已经在Swift 4.2上尝试过它，希望它对您有用！

@IBDesignable class PaddingLabel: UILabel {

    @IBInspectable var topInset: CGFloat = 5.0
    @IBInspectable var bottomInset: CGFloat = 5.0
    @IBInspectable var leftInset: CGFloat = 7.0
    @IBInspectable var rightInset: CGFloat = 7.0

    override func drawText(in rect: CGRect) {
        let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: rect.inset(by: insets))
    }

    override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + leftInset + rightInset,
                      height: size.height + topInset + bottomInset)
    }   

    override var bounds: CGRect {
        didSet {
            // ensures this works within stack views if multi-line
            preferredMaxLayoutWidth = bounds.width - (leftInset + rightInset)
        }
    } 
}

或者您可以在这里使用CocoaPods https://github.com/levantAJ/PaddingLabel

pod 'PaddingLabel', '1.2'

迅捷3

import UIKit

class PaddingLabel: UILabel {

   @IBInspectable var topInset: CGFloat = 5.0
   @IBInspectable var bottomInset: CGFloat = 5.0
   @IBInspectable var leftInset: CGFloat = 5.0
   @IBInspectable var rightInset: CGFloat = 5.0

   override func drawText(in rect: CGRect) {
      let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
      super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
   }

   override var intrinsicContentSize: CGSize {
      get {
         var contentSize = super.intrinsicContentSize
         contentSize.height += topInset + bottomInset
         contentSize.width += leftInset + rightInset
         return contentSize
      }
   }
}

您可以从IB正确地做到这一点：

1. 将文本更改为归因

2. 用“ ...”转到下拉列表

3. 您将看到行，段落和文本的某些填充属性，以缩进第一行或您想要的任何内容为准

4. 检查结果

SWIFT 4

易于使用的解决方案，适用于项目中的所有UILabel子级。

例：

let label = UILabel()
    label.<Do something>
    label.padding = UIEdgeInsets(top: 0, left: 16, bottom: 0, right: 0)

UILabel扩展

import UIKit

extension UILabel {
    private struct AssociatedKeys {
        static var padding = UIEdgeInsets()
    }

    public var padding: UIEdgeInsets? {
        get {
            return objc_getAssociatedObject(self, &AssociatedKeys.padding) as? UIEdgeInsets
        }
        set {
            if let newValue = newValue {
                objc_setAssociatedObject(self, &AssociatedKeys.padding, newValue as UIEdgeInsets?, objc_AssociationPolicy.OBJC_ASSOCIATION_RETAIN_NONATOMIC)
            }
        }
    }

    override open func draw(_ rect: CGRect) {
        if let insets = padding {
            self.drawText(in: rect.inset(by: insets))
        } else {
            self.drawText(in: rect)
        }
    }

    override open var intrinsicContentSize: CGSize {
        guard let text = self.text else { return super.intrinsicContentSize }

        var contentSize = super.intrinsicContentSize
        var textWidth: CGFloat = frame.size.width
        var insetsHeight: CGFloat = 0.0
        var insetsWidth: CGFloat = 0.0

        if let insets = padding {
            insetsWidth += insets.left + insets.right
            insetsHeight += insets.top + insets.bottom
            textWidth -= insetsWidth
        }

        let newSize = text.boundingRect(with: CGSize(width: textWidth, height: CGFloat.greatestFiniteMagnitude),
                                        options: NSStringDrawingOptions.usesLineFragmentOrigin,
                                        attributes: [NSAttributedString.Key.font: self.font], context: nil)

        contentSize.height = ceil(newSize.size.height) + insetsHeight
        contentSize.width = ceil(newSize.size.width) + insetsWidth

        return contentSize
    }
}

只需将a UIView用作超级视图，然后使用自动布局即可为标签定义固定的边距。

只需使用已经内置的UIButton。关闭所有其他按钮功能，您便可以使用标签设置边缘instets。

let button = UIButton()
button.contentEdgeInsets = UIEdgeInsets(top: 5, left: 5, bottom: 5, right: 5)
button.setTitle("title", for: .normal)
button.tintColor = .white // this will be the textColor
button.isUserInteractionEnabled = false

没有情节提要：

class PaddingLabel: UILabel {

    var topInset: CGFloat
    var bottomInset: CGFloat
    var leftInset: CGFloat
    var rightInset: CGFloat

    required init(withInsets top: CGFloat, _ bottom: CGFloat,_ left: CGFloat,_ right: CGFloat) {
        self.topInset = top
        self.bottomInset = bottom
        self.leftInset = left
        self.rightInset = right
        super.init(frame: CGRect.zero)
    }

    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }

    override func drawText(in rect: CGRect) {
        let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }

    override var intrinsicContentSize: CGSize {
        get {
            var contentSize = super.intrinsicContentSize
            contentSize.height += topInset + bottomInset
            contentSize.width += leftInset + rightInset
            return contentSize
        }
    }
}

用法：

let label = PaddingLabel(8, 8, 16, 16)
label.font = .boldSystemFont(ofSize: 16)
label.text = "Hello World"
label.backgroundColor = .black
label.textColor = .white
label.textAlignment = .center
label.layer.cornerRadius = 8
label.clipsToBounds = true
label.sizeToFit()

view.addSubview(label)

结果：

填充UILabel完整的解决方案。于2020年更新。

事实证明，必须完成三件事。

1.必须使用新的较小尺寸调用textRect＃forBounds

2.必须使用新的较小尺寸覆盖drawText

3.如果单元格的大小是动态的，则必须调整internalContentSize

在下面的典型示例中，文本单元处于表格视图，堆栈视图或类似的构造中，从而为其提供了固定的宽度。在示例中，我们希望填充为60,20,20,24。

因此，我们采用“现有的” internalContentSize 并实际上将80加到height。

重复 ...

您必须从字面上“获取”由引擎“到目前为止”计算出的高度，然后更改该值。

我发现该过程令人困惑，但这就是它的工作原理。对我来说，Apple应该公开一个名为“初步高度计算”之类的电话。

其次，我们必须实际使用具有较小的新大小的textRect＃forBounds调用。

因此，在textRect＃forBounds中，我们首先减小尺寸，然后调用super。

警报！您必须在之后而不是之前致电super ！

如果您仔细调查此页面上的所有尝试和讨论，那就是确切的问题。注意一些解决方案“似乎几乎可以工作”，但是有人会报告在某些情况下它不起作用。这确实是确切的原因-令人困惑的是，您必须“事后呼叫超级”，而不是之前。

因此，如果将super称为“顺序错误”，则通常可以使用，但对于某些特定的文本长度则无效。

这是“不正确地做超级第一”的确切视觉示例：

注意，60,20,20,24的边距是正确的，但是大小计算实际上是错误的，因为它是使用textRect＃forBounds中的“ super first”模式完成的。

固定：

注意，只有现在，textRect＃forBounds引擎才知道如何正确进行计算：

最后！

同样，在此示例中，UILabel在固定宽度的典型情况下使用。因此，在internalContentSize中，我们必须“添加”所需的整体额外高度。（您不需要以任何方式“添加”宽度，因为它是固定的，所以没有意义。）

然后在textRect＃forBounds中，通过自动布局获得“建议的边界”，减去边距，然后再次调用textRect＃forBounds引擎，也就是说在super中，它将为您提供结果。

最后，简单地在drawText中，您当然可以在同一较小的框中绘制。

！

let UIEI = UIEdgeInsets(top: 60, left: 20, bottom: 20, right: 24) // as desired

override var intrinsicContentSize:CGSize {
    numberOfLines = 0       // don't forget!
    var s = super.intrinsicContentSize
    s.height = s.height + UIEI.top + UIEI.bottom
    s.width = s.width + UIEI.left + UIEI.right
    return s
}

override func drawText(in rect:CGRect) {
    let r = rect.inset(by: UIEI)
    super.drawText(in: r)
}

override func textRect(forBounds bounds:CGRect,
                           limitedToNumberOfLines n:Int) -> CGRect {
    let b = bounds
    let tr = b.inset(by: UIEI)
    let ctr = super.textRect(forBounds: tr, limitedToNumberOfLines: 0)
    // that line of code MUST be LAST in this function, NOT first
    return ctr
}

再来一次。注意，在此和其他QA上“几乎”正确的答案在上面的第一张图片中遇到了问题- “超级位置错误”。您必须在internalContentSize中强制增大该大小，然后在textRect＃forBounds中必须首先缩小第一个建议边界，然后调用super。

摘要：您必须在textRect＃forBounds中“呼叫超级倒数 ”

那是秘密。

请注意，您不需要也不需要另外调用invalidate，sizeThatFits，needsLayout或任何其他强制调用。正确的解决方案应在正常的自动布局绘制循环中正常工作。

小费：

如果您正在使用等宽字体，这里有个很好的提示：https : //stackoverflow.com/a/59813420/294884

迅捷4+

class EdgeInsetLabel: UILabel {
    var textInsets = UIEdgeInsets.zero {
        didSet { invalidateIntrinsicContentSize() }
    }

    override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
        let textRect = super.textRect(forBounds: bounds, limitedToNumberOfLines: numberOfLines)
        let invertedInsets = UIEdgeInsets(top: -textInsets.top,
                                          left: -textInsets.left,
                                          bottom: -textInsets.bottom,
                                          right: -textInsets.right)
        return textRect.inset(by: invertedInsets)
    }

    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: textInsets))
    } 
}

用法：

let label = EdgeInsetLabel()
label.textInsets = UIEdgeInsets(top: 2, left: 6, bottom: 2, right: 6)

Swift 3代码与实现示例

class UIMarginLabel: UILabel {

    var topInset:       CGFloat = 0
    var rightInset:     CGFloat = 0
    var bottomInset:    CGFloat = 0
    var leftInset:      CGFloat = 0

    override func drawText(in rect: CGRect) {
        let insets: UIEdgeInsets = UIEdgeInsets(top: self.topInset, left: self.leftInset, bottom: self.bottomInset, right: self.rightInset)
        self.setNeedsLayout()
        return super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }
}

class LabelVC: UIViewController {

    //Outlets
    @IBOutlet weak var labelWithMargin: UIMarginLabel!

    override func viewDidLoad() {
        super.viewDidLoad()

        //Label settings.
        labelWithMargin.leftInset = 10
        view.layoutIfNeeded()
    }
}

不要忘记在情节提要标签对象中添加类名称UIMarginLabel。编码愉快！

根据Swift 4.2（Xcode 10 beta 6），“ UIEdgeInsetsInsetRect”已弃用。我还宣布了该类的公开性，以使其更加有用。

public class UIPaddedLabel: UILabel {

    @IBInspectable var topInset: CGFloat = 5.0
    @IBInspectable var bottomInset: CGFloat = 5.0
    @IBInspectable var leftInset: CGFloat = 7.0
    @IBInspectable var rightInset: CGFloat = 7.0

    public override func drawText(in rect: CGRect) {
        let insets = UIEdgeInsets.init(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: rect.inset(by: insets))
    }

    public override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + leftInset + rightInset,
                      height: size.height + topInset + bottomInset)
    }

    public override func sizeToFit() {
        super.sizeThatFits(intrinsicContentSize)
    }
}

我在接受的答案中做了一些编辑。当leftInset和rightInset增加时出现问题，部分文本会消失，b / c标签的宽度会变窄，但高度不会增加，如图所示：

要解决此问题，您需要重新计算文本高度，如下所示：

@IBDesignable class PaddingLabel: UILabel {

  @IBInspectable var topInset: CGFloat = 20.0
  @IBInspectable var bottomInset: CGFloat = 20.0
  @IBInspectable var leftInset: CGFloat = 20.0
  @IBInspectable var rightInset: CGFloat = 20.0

  override func drawTextInRect(rect: CGRect) {
    let insets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
    super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))
  }

  override func intrinsicContentSize() -> CGSize {
    var intrinsicSuperViewContentSize = super.intrinsicContentSize()

    let textWidth = frame.size.width - (self.leftInset + self.rightInset)
    let newSize = self.text!.boundingRectWithSize(CGSizeMake(textWidth, CGFloat.max), options: NSStringDrawingOptions.UsesLineFragmentOrigin, attributes: [NSFontAttributeName: self.font], context: nil)
    intrinsicSuperViewContentSize.height = ceil(newSize.size.height) + self.topInset + self.bottomInset

    return intrinsicSuperViewContentSize
  }
}

结果：

我希望能帮助一些和我一样的人。

没有子类的另一种选择是：

1. 设置标签 text
2. sizeToFit()

3. 然后稍微增加标签高度以模拟填充

   label.text = "someText"
   label.textAlignment = .center    
   label.sizeToFit()  
   label.frame = CGRect( x: label.frame.x, y: label.frame.y,width:  label.frame.width + 20,height: label.frame.height + 8)

Swift 3，iOS10解决方案：

open class UIInsetLabel: UILabel {

    open var insets : UIEdgeInsets = UIEdgeInsets() {
        didSet {
            super.invalidateIntrinsicContentSize()
        }
    }

    open override var intrinsicContentSize: CGSize {
        var size = super.intrinsicContentSize
        size.width += insets.left + insets.right
        size.height += insets.top + insets.bottom
        return size
    }

    override open func drawText(in rect: CGRect) {
        return super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }
}

只需使用自动布局：

let paddedWidth = myLabel.intrinsicContentSize.width + 2 * padding
myLabel.widthAnchor.constraint(equalToConstant: paddedWidth).isActive = true

做完了

在Swift 3中

最好的简单方法

class UILabelPadded: UILabel {
     override func drawText(in rect: CGRect) {
     let insets = UIEdgeInsets.init(top: 0, left: 5, bottom: 0, right: 5)
     super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }

}

子类UILabel。（UILabel的File-New-File-CocoaTouchClass-make子类）。

//  sampleLabel.swift

import UIKit

class sampleLabel: UILabel {

 let topInset = CGFloat(5.0), bottomInset = CGFloat(5.0), leftInset = CGFloat(8.0), rightInset = CGFloat(8.0)

 override func drawTextInRect(rect: CGRect) {

  let insets: UIEdgeInsets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
  super.drawTextInRect(UIEdgeInsetsInsetRect(rect, insets))

 }
 override func intrinsicContentSize() -> CGSize {
  var intrinsicSuperViewContentSize = super.intrinsicContentSize()
  intrinsicSuperViewContentSize.height += topInset + bottomInset
  intrinsicSuperViewContentSize.width += leftInset + rightInset
  return intrinsicSuperViewContentSize
 }
}

在ViewController上：

override func viewDidLoad() {
  super.viewDidLoad()

  let labelName = sampleLabel(frame: CGRectMake(0, 100, 300, 25))
  labelName.text = "Sample Label"
  labelName.backgroundColor =  UIColor.grayColor()

  labelName.textColor = UIColor.redColor()
  labelName.shadowColor = UIColor.blackColor()
  labelName.font = UIFont(name: "HelveticaNeue", size: CGFloat(22))
  self.view.addSubview(labelName)
 }

或将故事板上的自定义UILabel类与Label的类相关联。

就像其他答案一样，但修复错误。当label.width由自动布局控制时，有时会裁切文本。

@IBDesignable
class InsetLabel: UILabel {

    @IBInspectable var topInset: CGFloat = 4.0
    @IBInspectable var leftInset: CGFloat = 4.0
    @IBInspectable var bottomInset: CGFloat = 4.0
    @IBInspectable var rightInset: CGFloat = 4.0

    var insets: UIEdgeInsets {
        get {
            return UIEdgeInsets.init(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        }
        set {
            topInset = newValue.top
            leftInset = newValue.left
            bottomInset = newValue.bottom
            rightInset = newValue.right
        }
    }

    override func sizeThatFits(_ size: CGSize) -> CGSize {
        var adjSize = super.sizeThatFits(size)
        adjSize.width += leftInset + rightInset
        adjSize.height += topInset + bottomInset
        return adjSize
    }

    override var intrinsicContentSize: CGSize {
        let systemContentSize = super.intrinsicContentSize
        let adjustSize = CGSize(width: systemContentSize.width + leftInset + rightInset, height: systemContentSize.height + topInset +  bottomInset) 
        if adjustSize.width > preferredMaxLayoutWidth && preferredMaxLayoutWidth != 0 {
            let constraintSize = CGSize(width: bounds.width - (leftInset + rightInset), height: .greatestFiniteMagnitude)
            let newSize = super.sizeThatFits(constraintSize)
            return CGSize(width: systemContentSize.width, height: ceil(newSize.height) + topInset + bottomInset)
        } else {
            return adjustSize
        }
    }

    override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: insets))
    }
}

轻松填充（Swift 3.0，Alvin George回答）：

  class NewLabel: UILabel {

        override func textRect(forBounds bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {
                return self.bounds.insetBy(dx: CGFloat(15.0), dy: CGFloat(15.0))
        }

        override func draw(_ rect: CGRect) {
                super.drawText(in: self.bounds.insetBy(dx: CGFloat(5.0), dy: CGFloat(5.0)))
        }

  }

详细阐述Mundi的答案。

即在中嵌入标签，UIView并通过自动版式强制填充。例：

概述：

1）创建一个UIView（“面板”），并设置其外观。

2）创建一个UILabel并将其添加到面板中。

3）添加约束以强制执行填充。

4）将面板添加到视图层次结构中，然后放置面板。

细节：

1）创建面板视图。

let panel = UIView()
panel.backgroundColor = .green
panel.layer.cornerRadius = 12

2）创建标签，将其作为子视图添加到面板中。

let label = UILabel()
panel.addSubview(label)

3）在标签和面板的边缘之间添加约束。这迫使面板与标签保持一定距离。即“填充”

社论：手动完成所有这些操作非常繁琐，冗长且容易出错。我建议您从github选择一个自动布局包装器，或者自己写一个

label.panel.translatesAutoresizingMaskIntoConstraints = false
label.topAnchor.constraint(equalTo: panel.topAnchor,
    constant: vPadding).isActive = true
label.bottomAnchor.constraint(equalTo: panel.bottomAnchor,
    constant: -vPadding).isActive = true
label.leadingAnchor.constraint(equalTo: panel.leadingAnchor,
    constant: hPadding).isActive = true
label.trailingAnchor.constraint(equalTo: panel.trailingAnchor,
    constant: -hPadding).isActive = true

label.textAlignment = .center

4）将面板添加到视图层次结构，然后添加定位约束。例如，如示例图片所示，拥抱tableViewCell的右侧。

注意：您只需要添加位置约束，而无需添加尺寸约束：“自动布局”将基于intrinsicContentSize标签的以及之前添加的约束来解决布局。

hostView.addSubview(panel)
panel.translatesAutoresizingMaskIntoConstraints = false
panel.trailingAnchor.constraint(equalTo: hostView.trailingAnchor,
    constant: -16).isActive = true
panel.centerYAnchor.constraint(equalTo: hostView.centerYAnchor).isActive = true

如果在应用填充时遇到文本修剪问题，请使用此代码。

@IBDesignable class PaddingLabel: UILabel {

    @IBInspectable var topInset: CGFloat = 5.0
    @IBInspectable var bottomInset: CGFloat = 5.0
    @IBInspectable var leftInset: CGFloat = 5.0
    @IBInspectable var rightInset: CGFloat = 5.0

    override func drawText(in rect: CGRect) {
        let insets = UIEdgeInsets.init(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }

    override var intrinsicContentSize: CGSize {
        var intrinsicSuperViewContentSize = super.intrinsicContentSize
        let textWidth = frame.size.width - (self.leftInset + self.rightInset)
        let newSize = self.text!.boundingRect(with: CGSize(textWidth, CGFloat.greatestFiniteMagnitude), options: NSStringDrawingOptions.usesLineFragmentOrigin, attributes: [NSFontAttributeName: self.font], context: nil)
        intrinsicSuperViewContentSize.height = ceil(newSize.size.height) + self.topInset + self.bottomInset
        return intrinsicSuperViewContentSize
    }
}

extension CGSize{
    init(_ width:CGFloat,_ height:CGFloat) {
        self.init(width:width,height:height)
    }
}

与其他答案类似，但是具有func类来动态设置填充：

class UILabelExtendedView: UILabel
{
    var topInset: CGFloat = 4.0
    var bottomInset: CGFloat = 4.0
    var leftInset: CGFloat = 8.0
    var rightInset: CGFloat = 8.0

    override func drawText(in rect: CGRect)
    {
        let insets: UIEdgeInsets = UIEdgeInsets(top: topInset, left: leftInset, bottom: bottomInset, right: rightInset)
        super.drawText(in: UIEdgeInsetsInsetRect(rect, insets))
    }

    override public var intrinsicContentSize: CGSize
    {
        var contentSize = super.intrinsicContentSize
        contentSize.height += topInset + bottomInset
        contentSize.width += leftInset + rightInset
        return contentSize
    }

    func setPadding(top: CGFloat, left: CGFloat, bottom: CGFloat, right: CGFloat){
        self.topInset = top
        self.bottomInset = bottom
        self.leftInset = left
        self.rightInset = right
        let insets: UIEdgeInsets = UIEdgeInsets(top: top, left: left, bottom: bottom, right: right)
        super.drawText(in: UIEdgeInsetsInsetRect(self.frame, insets))
    }
}

一种实用的解决方案是添加高度和颜色与主标签相同的空白标签。将主标签的前导/尾随空间设置为零，对齐垂直中心，并使宽度成为所需的边距。

如果要在textRect周围添加2px填充，请执行以下操作：

let insets = UIEdgeInsets(top: -2, left: -2, bottom: -2, right: -2)
label.frame = UIEdgeInsetsInsetRect(textRect, insets)

如果您不想或不需要在Storyboard中使用@IBInspectable / @IBDesignable UILabel（我认为它们渲染得太慢了），那么使用UIEdgeInsets而不是4种不同的CGFloat会更干净。

Swift 4.2的代码示例：

class UIPaddedLabel: UILabel {
    var padding = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)

    public override func drawText(in rect: CGRect) {
        super.drawText(in: rect.inset(by: padding))
    }

    public override var intrinsicContentSize: CGSize {
        let size = super.intrinsicContentSize
        return CGSize(width: size.width + padding.left + padding.right,
                      height: size.height + padding.top + padding.bottom)
    }
}

物镜

基于大乐那里的答案，该答案在IB Designable中实现了该功能，这就是Objective-C版本。

把它放在YourLabel.h中

@interface YourLabel : UILabel

@property IBInspectable CGFloat topInset;
@property IBInspectable CGFloat bottomInset;
@property IBInspectable CGFloat leftInset;
@property IBInspectable CGFloat rightInset;

@end

这将放在YourLabel.m中

IB_DESIGNABLE

@implementation YourLabel

#pragma mark - Super

- (instancetype)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.topInset = 0;
        self.bottomInset = 0;
        self.leftInset = 0;
        self.rightInset = 0;
    }
    return self;
}

- (void)drawTextInRect:(CGRect)rect {
    UIEdgeInsets insets = UIEdgeInsetsMake(self.topInset, self.leftInset, self.bottomInset, self.rightInset);
    [super drawTextInRect:UIEdgeInsetsInsetRect(rect, insets)];
}

- (CGSize)intrinsicContentSize {

    CGSize size = [super intrinsicContentSize];
    return CGSizeMake(size.width + self.leftInset + self.rightInset,
                      size.height + self.topInset + self.bottomInset);
}

@end

然后，您可以在XIB或情节提要中指定类后，直接在Interface Builder中修改YourLabel插图，这些插图的默认值为零。

简单的方法

import UIKit

class ViewController: UIViewController {

    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.

        self.view.addSubview(makeLabel("my title",x: 0, y: 100, w: 320, h: 30))
    }

    func makeLabel(title:String, x:CGFloat, y:CGFloat, w:CGFloat, h:CGFloat)->UILabel{
        var myLabel : UILabel = UILabel(frame: CGRectMake(x,y,w,h))
        myLabel.textAlignment = NSTextAlignment.Right

        // inser last char to right
        var titlePlus1char = "\(title)1"
        myLabel.text = titlePlus1char
        var titleSize:Int = count(titlePlus1char)-1

        myLabel.textColor = UIColor(red:1.0, green:1.0,blue:1.0,alpha:1.0)
        myLabel.backgroundColor = UIColor(red: 214/255, green: 167/255, blue: 0/255,alpha:1.0)


        // create myMutable String
        var myMutableString = NSMutableAttributedString()

        // create myMutable font
        myMutableString = NSMutableAttributedString(string: titlePlus1char, attributes: [NSFontAttributeName:UIFont(name: "HelveticaNeue", size: 20)!])

        // set margin size
        myMutableString.addAttribute(NSFontAttributeName, value: UIFont(name: "HelveticaNeue", size: 10)!, range: NSRange(location: titleSize,length: 1))

        // set last char to alpha 0
        myMutableString.addAttribute(NSForegroundColorAttributeName, value: UIColor(red:1.0, green:1.0,blue:1.0,alpha:0), range: NSRange(location: titleSize,length: 1))

        myLabel.attributedText = myMutableString

        return myLabel
    }


    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }

}

易于填充：

import UIKit

    class NewLabel: UILabel {

        override func textRectForBounds(bounds: CGRect, limitedToNumberOfLines numberOfLines: Int) -> CGRect {

            return CGRectInset(self.bounds, CGFloat(15.0), CGFloat(15.0))
        }

        override func drawRect(rect: CGRect) {

            super.drawTextInRect(CGRectInset(self.bounds,CGFloat(5.0), CGFloat(5.0)))
        }

    }

迅捷4+

let paragraphStyle = NSMutableParagraphStyle()
paragraphStyle.firstLineHeadIndent = 10

// Swift 4.2++
label.attributedText = NSAttributedString(string: "Your text", attributes: [NSAttributedString.Key.paragraphStyle: paragraphStyle])

// Swift 4.1--
label.attributedText = NSAttributedString(string: "Your text", attributes: [NSAttributedStringKey.paragraphStyle: paragraphStyle])