一、定义一个枚举

enum ButtonImageAndTitlePossitionStyle {
    case systemDefault  //图片在左，文字在右，整体居中。(系统,没有间距设置)
    case imageIsLeft    //图片在左，文字在右，整体居中
    case imageIsRight   //图片在右，文字在左，整体居中
    case imageIsTop     //图片在上，文字在下，整体居中
    case imgageIsBottom //图片在下，文字在上，整体居中
}

二、UIbutton的 extension

extension UIButton {
    //MARK: - 按枚举将 btn 的 image 和 title 之间位置处理
    func setupButtonImageAndTitlePossitionWith(padding: CGFloat, style: ButtonImageAndTitlePossitionStyle){
        let imageRect: CGRect = self.imageView?.frame ?? CGRect.init()
        let titleRect: CGRect = self.titleLabel?.frame ?? CGRect.init()
        let selfWidth: CGFloat = self.frame.size.width
        let selfHeight: CGFloat = self.frame.size.height
        let totalHeight = titleRect.size.height + padding + imageRect.size.height
        switch style {
        case .imageIsLeft:
            self.titleEdgeInsets = UIEdgeInsets(top: 0, left: padding / 2, bottom: 0, right: -padding / 2)
            self.imageEdgeInsets = UIEdgeInsets(top: 0, left: -padding / 2, bottom: 0, right: padding / 2)
        case .imageIsRight:
            self.titleEdgeInsets = UIEdgeInsets(top: 0, left: -(imageRect.size.width + padding/2), bottom: 0, right: (imageRect.size.width + padding/2))
            self.imageEdgeInsets = UIEdgeInsets(top: 0, left: (titleRect.size.width + padding / 2), bottom: 0, right: -(titleRect.size.width +  padding/2))
        case .imageIsTop :
            self.titleEdgeInsets = UIEdgeInsets(top: ((selfHeight - totalHeight) / 2 + imageRect.size.height + padding - titleRect.origin.y), left: (selfWidth / 2 - titleRect.origin.x - titleRect.size.width / 2) - (selfWidth - titleRect.size.width) / 2, bottom: -((selfHeight - totalHeight) / 2 + imageRect.size.height + padding - titleRect.origin.y), right: -(selfWidth / 2 - titleRect.origin.x - titleRect.size.width / 2) - (selfWidth - titleRect.size.width) / 2)
            self.imageEdgeInsets = UIEdgeInsets(top: ((selfHeight - totalHeight) / 2 - imageRect.origin.y), left: (selfWidth / 2 - imageRect.origin.x - imageRect.size.width / 2), bottom: -((selfHeight - totalHeight) / 2 - imageRect.origin.y), right: -(selfWidth / 2 - imageRect.origin.x - imageRect.size.width / 2))
        case .imgageIsBottom:
            self.titleEdgeInsets = UIEdgeInsets(top: ((selfHeight - totalHeight) / 2 - titleRect.origin.y), left: (selfWidth / 2 - titleRect.origin.x - titleRect.size.width / 2) - (selfWidth - titleRect.size.width) / 2, bottom: -((selfHeight - totalHeight) / 2 - titleRect.origin.y), right: -(selfWidth/2 - titleRect.origin.x - titleRect.size.width / 2) - (selfWidth - titleRect.size.width) / 2)
            self.imageEdgeInsets = UIEdgeInsets(top: ((selfHeight - totalHeight) / 2 + titleRect.size.height + padding - imageRect.origin.y), left: (selfWidth / 2 - imageRect.origin.x - imageRect.size.width / 2), bottom: -((selfHeight - totalHeight) / 2 + titleRect.size.height + padding - imageRect.origin.y), right: -(selfWidth / 2 - imageRect.origin.x - imageRect.size.width / 2))
        default:
            self.titleEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
            self.imageEdgeInsets = UIEdgeInsets(top: 0, left: 0, bottom: 0, right: 0)
        }
    }
}

三、使用

• 注意啦，使用前需保证 UIButton的frame已经完成设置
• 如下使用

btn.setupButtonImageAndTitlePossitionWith(padding: 5, style: .imageIsRight)