swift 第四课 随意 设置button 图片和文字 位置

项目中经常遇到按钮改变文字和图片位置的情况，所以尝试写一个 button 的分类：

参照连接 http://blog.csdn.net/dfqin/article/details/37813591

import Foundation
import UIKit

/*
枚举 设置 图片的位置
*/
enum ButtonImagePosition : Int{case PositionTop = 0case Positionleftcase PositionBottomcase PositionRight
}extension UIButton {
/**
imageName:图片的名字
title：button 的名字
type ：image 的位置 
Space ：图片文字之间的间距    
*/func setImageAndTitle(imageName:String,title:String,type:ButtonImagePosition,Space space:CGFloat)  {self.setTitle(title, for: .normal)self.setImage(UIImage(named:imageName), for: .normal)let imageWith :CGFloat = (self.imageView?.frame.size.width)!;let imageHeight :CGFloat = (self.imageView?.frame.size.height)!;var labelWidth :CGFloat = 0.0;var labelHeight :CGFloat = 0.0;labelWidth = CGFloat(self.titleLabel!.intrinsicContentSize.width);labelHeight = CGFloat(self.titleLabel!.intrinsicContentSize.height);
var  imageEdgeInsets :UIEdgeInsets = UIEdgeInsets();var  labelEdgeInsets :UIEdgeInsets = UIEdgeInsets();switch type {case .PositionTop:imageEdgeInsets = UIEdgeInsetsMake(-labelHeight - space/2.0, 0, 0, -labelWidth);labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith, -imageHeight-space/2.0, 0);break;case .Positionleft:imageEdgeInsets = UIEdgeInsetsMake(0, -space/2.0, 0, space/2.0);labelEdgeInsets = UIEdgeInsetsMake(0, space/2.0, 0, -space/2.0);break;case .PositionBottom:imageEdgeInsets = UIEdgeInsetsMake(0, 0, -labelHeight-space/2.0, -labelWidth);labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, 0, 0);break;case .PositionRight:imageEdgeInsets = UIEdgeInsetsMake(0, labelWidth+space/2.0, 0, -labelWidth-space/2.0);labelEdgeInsets = UIEdgeInsetsMake(0, -imageWith-space/2.0, 0, imageWith+space/2.0);break;}// 4. 赋值self.titleEdgeInsets = labelEdgeInsets;self.imageEdgeInsets = imageEdgeInsets;}
}

调用方法:

/*
使用方便 用xib 中建立的 leftBtn
*/
  
leftBtn.setImageAndTitle(imageName: "hezuojigou", title: "合作机构", type: .PositionTop, Space: 0.0)