iOS开发swift之设置button文字跟图片排列任意对齐方式

//
//  Button+Extension.swift
//  Shop
//
//  Created by fox on 2020/11/25.
//  Copyright © 2020 Aos. All rights reserved.
//
import Foundation
import UIKit
import Foundation

/// 自定义button
enum ButtonEdgeInsetsStyle {
   case ButtonEdgeInsetsStyleTop // image在上，label在下
   case ButtonEdgeInsetsStyleLeft  // image在左，label在右
   case ButtonEdgeInsetsStyleBottom  // image在下，label在上
   case ButtonEdgeInsetsStyleRight // image在右，label在左
}

extension UIButton {
    func layoutButtonEdgeInsets(style:ButtonEdgeInsetsStyle,space:CGFloat) {
      var labelWidth : CGFloat = 0.0
      var labelHeight : CGFloat = 0.0
      var imageEdgeInset = UIEdgeInsets.zero
      var labelEdgeInset = UIEdgeInsets.zero
      let imageWith = self.imageView?.frame.size.width
      let imageHeight = self.imageView?.frame.size.height
      let vue = (UIDevice.current.systemVersion) as NSString
    
        if vue.doubleValue >= 8.0 {
        
        labelWidth = (self.titleLabel?.intrinsicContentSize.width)!
        labelHeight = (self.titleLabel?.intrinsicContentSize.height)!
      }else {
        labelWidth = (self.titleLabel?.frame.size.width)!
        labelHeight = (self.titleLabel?.frame.size.height)!
      }
     
      switch style {
      case .ButtonEdgeInsetsStyleTop:
        imageEdgeInset = UIEdgeInsets(top: -labelHeight-space/2.0, left: 0, bottom: 0, right: -labelWidth)
        labelEdgeInset = UIEdgeInsets(top: 0, left: -imageWith!, bottom: -imageHeight!-space/2.0, right: 0)
      case .ButtonEdgeInsetsStyleLeft:
        imageEdgeInset = UIEdgeInsets(top: 0, left: -space/2.0, bottom: 0, right: space/2.0);
        labelEdgeInset = UIEdgeInsets(top: 0, left: space/2.0, bottom: 0, right: -space/2.0);
      case .ButtonEdgeInsetsStyleBottom:
        imageEdgeInset = UIEdgeInsets(top: 0, left: 0, bottom: -labelHeight-space/2.0, right: -labelWidth)
        labelEdgeInset = UIEdgeInsets(top: -imageHeight!-space/2.0, left: -imageWith!, bottom: 0, right: 0)
      case .ButtonEdgeInsetsStyleRight:
          // To Do print("坐标是====\(labelWidth)=====\(space)")
        imageEdgeInset = UIEdgeInsets(top: 0, left: labelWidth+space/2.0, bottom: 0, right: -labelWidth-space/2.0)
        labelEdgeInset = UIEdgeInsets(top: 0, left: -imageWith!-space/2.0, bottom: 0, right: imageWith!+space/2.0)
      }
      self.titleEdgeInsets = labelEdgeInset
      self.imageEdgeInsets = imageEdgeInset
  }
}