在接口生成器中。选择UIButton -> Attributes Inspector -> Edge=Title并修改边缘插入

下面是一个如何使用imageEdgeInsets的简单示例 这将创建一个30x30的按钮，可点击区域增大10个像素(50x50)

    var expandHittableAreaAmt : CGFloat = 10
    var buttonWidth : CGFloat = 30
    var button = UIButton.buttonWithType(UIButtonType.Custom) as UIButton
    button.frame = CGRectMake(0, 0, buttonWidth+expandHittableAreaAmt, buttonWidth+expandHittableAreaAmt)
    button.imageEdgeInsets = UIEdgeInsetsMake(expandHittableAreaAmt, expandHittableAreaAmt, expandHittableAreaAmt, expandHittableAreaAmt)
    button.setImage(UIImage(named: "buttonImage"), forState: .Normal)
    button.addTarget(self, action: "didTouchButton:", forControlEvents:.TouchUpInside)

Riley Avron回答的一个小补充，以解释地区变化:

extension UIButton {
    func centerTextAndImage(spacing: CGFloat) {
        let insetAmount = spacing / 2
        let writingDirection = UIApplication.sharedApplication().userInterfaceLayoutDirection
        let factor: CGFloat = writingDirection == .LeftToRight ? 1 : -1

        self.imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount*factor, bottom: 0, right: insetAmount*factor)
        self.titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount*factor, bottom: 0, right: -insetAmount*factor)
        self.contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
    }
}

根据iOS 15及以上版本:

var config = UIButton.Configuration.plain() // depends on the button you want 
config.image = UIImage(named: "view_all") // set the image 
config.imagePadding = 5 // add the insets for the image 
button.configuration = config // assign the config to the button 

来源: https://developer.apple.com/documentation/uikit/uibutton/configuration

下面是我写的代码。它在产品版本中运行良好。支持Swift 4.2 +

extension UIButton{
 enum ImageTitleRelativeLocation {
    case imageUpTitleDown
    case imageDownTitleUp
    case imageLeftTitleRight
    case imageRightTitleLeft
}
 func centerContentRelativeLocation(_ relativeLocation: 
                                      ImageTitleRelativeLocation,
                                   spacing: CGFloat = 0) {
    assert(contentVerticalAlignment == .center,
           "only works with contentVerticalAlignment = .center !!!")

    guard (title(for: .normal) != nil) || (attributedTitle(for: .normal) != nil) else {
        assert(false, "TITLE IS NIL! SET TITTLE FIRST!")
        return
    }

    guard let imageSize = self.currentImage?.size else {
        assert(false, "IMGAGE IS NIL! SET IMAGE FIRST!!!")
        return
    }
    guard let titleSize = titleLabel?
        .systemLayoutSizeFitting(UIView.layoutFittingCompressedSize) else {
            assert(false, "TITLELABEL IS NIL!")
            return
    }

    let horizontalResistent: CGFloat
    // extend contenArea in case of title is shrink
    if frame.width < titleSize.width + imageSize.width {
        horizontalResistent = titleSize.width + imageSize.width - frame.width
        print("horizontalResistent", horizontalResistent)
    } else {
        horizontalResistent = 0
    }

    var adjustImageEdgeInsets: UIEdgeInsets = .zero
    var adjustTitleEdgeInsets: UIEdgeInsets = .zero
    var adjustContentEdgeInsets: UIEdgeInsets = .zero

    let verticalImageAbsOffset = abs((titleSize.height + spacing) / 2)
    let verticalTitleAbsOffset = abs((imageSize.height + spacing) / 2)

    switch relativeLocation {
    case .imageUpTitleDown:

        adjustImageEdgeInsets.top = -verticalImageAbsOffset
        adjustImageEdgeInsets.bottom = verticalImageAbsOffset
        adjustImageEdgeInsets.left = titleSize.width / 2 + horizontalResistent / 2
        adjustImageEdgeInsets.right = -titleSize.width / 2 - horizontalResistent / 2

        adjustTitleEdgeInsets.top = verticalTitleAbsOffset
        adjustTitleEdgeInsets.bottom = -verticalTitleAbsOffset
        adjustTitleEdgeInsets.left = -imageSize.width / 2 + horizontalResistent / 2
        adjustTitleEdgeInsets.right = imageSize.width / 2 - horizontalResistent / 2

        adjustContentEdgeInsets.top = spacing
        adjustContentEdgeInsets.bottom = spacing
        adjustContentEdgeInsets.left = -horizontalResistent
        adjustContentEdgeInsets.right = -horizontalResistent
    case .imageDownTitleUp:
        adjustImageEdgeInsets.top = verticalImageAbsOffset
        adjustImageEdgeInsets.bottom = -verticalImageAbsOffset
        adjustImageEdgeInsets.left = titleSize.width / 2 + horizontalResistent / 2
        adjustImageEdgeInsets.right = -titleSize.width / 2 - horizontalResistent / 2

        adjustTitleEdgeInsets.top = -verticalTitleAbsOffset
        adjustTitleEdgeInsets.bottom = verticalTitleAbsOffset
        adjustTitleEdgeInsets.left = -imageSize.width / 2 + horizontalResistent / 2
        adjustTitleEdgeInsets.right = imageSize.width / 2 - horizontalResistent / 2

        adjustContentEdgeInsets.top = spacing
        adjustContentEdgeInsets.bottom = spacing
        adjustContentEdgeInsets.left = -horizontalResistent
        adjustContentEdgeInsets.right = -horizontalResistent
    case .imageLeftTitleRight:
        adjustImageEdgeInsets.left = -spacing / 2
        adjustImageEdgeInsets.right = spacing / 2

        adjustTitleEdgeInsets.left = spacing / 2
        adjustTitleEdgeInsets.right = -spacing / 2

        adjustContentEdgeInsets.left = spacing
        adjustContentEdgeInsets.right = spacing
    case .imageRightTitleLeft:
        adjustImageEdgeInsets.left = titleSize.width + spacing / 2
        adjustImageEdgeInsets.right = -titleSize.width - spacing / 2

        adjustTitleEdgeInsets.left = -imageSize.width - spacing / 2
        adjustTitleEdgeInsets.right = imageSize.width + spacing / 2

        adjustContentEdgeInsets.left = spacing
        adjustContentEdgeInsets.right = spacing
    }

    imageEdgeInsets = adjustImageEdgeInsets
    titleEdgeInsets = adjustTitleEdgeInsets
    contentEdgeInsets = adjustContentEdgeInsets

    setNeedsLayout()
}
}

我来这个派对有点晚，但我想我有一些有用的东西要补充。

Kekoa的答案很好，但正如RonLugge所提到的，它会使按钮不再尊重sizeToFit，更重要的是，它会导致按钮在固有大小时剪辑其内容。呵!

不过,首先

简单解释一下我是如何相信imageEdgeInsets和titleEdgeInsets工作的:

imageEdgeInsets的文档有以下内容:

使用此属性可调整按钮图像的有效绘图矩形的大小和位置。您可以为这四个嵌入(顶部、左侧、底部、右侧)中的每一个指定不同的值。正值会缩小或插入这条边——使它更靠近按钮的中心。负值会使这条边扩大或开始。

我相信这个文档是在想象这个按钮没有标题，只有一个图像的情况下编写的。用这种方式思考更有意义，并且表现得像UIEdgeInsets通常做的那样。基本上，图像的帧(或标题，带有titleEdgeInsets)对于正插入向内移动，对于负插入向外移动。

好吧，那又怎样?

我快到了!这是你默认设置的，设置一个图像和一个标题(按钮边框是绿色的，只是为了显示它的位置):

当你想要图像和标题之间有空格，而又不造成两者被压缩时，你需要设置四个不同的insets，图像和标题各两个。这是因为你不想改变这些元素帧的大小，而只是改变它们的位置。当你开始以这种方式思考时，Kekoa的优秀类别所需要的改变就变得清晰起来:

@implementation UIButton(ImageTitleCentering)

- (void)centerButtonAndImageWithSpacing:(CGFloat)spacing {
    CGFloat insetAmount = spacing / 2.0;
    self.imageEdgeInsets = UIEdgeInsetsMake(0, -insetAmount, 0, insetAmount);
    self.titleEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, -insetAmount);
}

@end

但是等等，你说，当我这样做的时候，我得到了这个:

噢,是的!我忘了，医生警告过我。他们部分地说:

此属性仅用于布局期间定位图像。按钮不使用此属性来确定intrinsicContentSize和sizeThatFits:。

但有一个属性可以提供帮助，那就是contenttedgeinsets。这方面的医生说:

按钮使用这个属性来确定intrinsicContentSize和sizeThatFits:。

听起来不错。所以让我们再一次调整这个类别:

@implementation UIButton(ImageTitleCentering)

- (void)centerButtonAndImageWithSpacing:(CGFloat)spacing {
    CGFloat insetAmount = spacing / 2.0;
    self.imageEdgeInsets = UIEdgeInsetsMake(0, -insetAmount, 0, insetAmount);
    self.titleEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, -insetAmount);
    self.contentEdgeInsets = UIEdgeInsetsMake(0, insetAmount, 0, insetAmount);
}

@end

得到什么?

在我看来是赢家。

在Swift中工作，却不想做任何思考?下面是Swift扩展的最终版本:

extension UIButton {

    func centerTextAndImage(spacing: CGFloat) {
        let insetAmount = spacing / 2
        let isRTL = UIView.userInterfaceLayoutDirection(for: semanticContentAttribute) == .rightToLeft
        if isRTL {
           imageEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: -insetAmount)
           titleEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount, bottom: 0, right: insetAmount)
           contentEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount, bottom: 0, right: -insetAmount)
        } else {
           imageEdgeInsets = UIEdgeInsets(top: 0, left: -insetAmount, bottom: 0, right: insetAmount)
           titleEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: -insetAmount)
           contentEdgeInsets = UIEdgeInsets(top: 0, left: insetAmount, bottom: 0, right: insetAmount)
        }
    }
}