Swift 4.2和5

let imageView = UIImageView()
imageView.image = UIImage(named: 
"image")?.withAlignmentRectInsets(UIEdgeInsets(top: -5, left: -5, bottom: -5, 
right: -5))

插入值应为负值

您可以将imageView插入到视图中，并设置对边的约束，保证方法：）

在新类中重写alignmentRectInsets属性：

class PaddedImageView: UIImageView {
    override var alignmentRectInsets: UIEdgeInsets {
        return UIEdgeInsets(top: -10, left: -10, bottom: -10, right: -10)
    }
}

下面是我构建的一个小助手扩展：

extension UIImage {
    func addPadding(_ padding: CGFloat) -> UIImage {
        let alignmentInset = UIEdgeInsets(top: -padding, left: -padding,
                                          bottom: -padding, right: -padding)
        return withAlignmentRectInsets(alignmentInset)
    }
}

let padding: CGFloat = 10    
myImageView.contentMode = .scaleAspectFill
myImageView.image = UIImage(named: "myImage.png").resizableImage(withCapInsets: UIEdgeInsets(top: padding, left: padding, bottom: padding, right: padding), resizingMode: .stretch)

Swift 5
在图像视图中的图像位置的右侧和左侧添加填充。

let image = UIImage(systemName: "circle.fill")
        let insets = UIEdgeInsets(top: 0, left: -15, bottom: 0, right: -15)
        let imageView = UIImageView(image: image.withAlignmentRectInsets(insets))

注解：UIStackView将对齐插图视为图像视图固有内容大小的贡献者。
`Use case example:

In my application, I have a vertical stack comprised of a small center-aligned UILabel stacked above a UIImageView in a UITableViewCell . Label width varies from cell to cell, varying respective vertical stack widths and shifting images' respective horizontal alignments. I.e. the images don't line up in the table.... By padding images with horizontal alignment insets, it forces vertical stack to have a consistent width greater than max expected label width, keeping images center-aligned vertically in the table.`