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 =
    case Positionleft
    case PositionBottom
    case 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, , , -labelWidth);
                labelEdgeInsets = UIEdgeInsetsMake(, -imageWith, -imageHeight-space/2.0, );
            break;
        case .Positionleft:
                imageEdgeInsets = UIEdgeInsetsMake(, -space/2.0, , space/2.0);
                labelEdgeInsets = UIEdgeInsetsMake(, space/2.0, , -space/2.0);
            break;
        case .PositionBottom:
                imageEdgeInsets = UIEdgeInsetsMake(, , -labelHeight-space/2.0, -labelWidth);
                labelEdgeInsets = UIEdgeInsetsMake(-imageHeight-space/2.0, -imageWith, , );
            break;
        case .PositionRight:
                imageEdgeInsets = UIEdgeInsetsMake(, labelWidth+space/2.0, , -labelWidth-space/2.0);
                labelEdgeInsets = UIEdgeInsetsMake(, -imageWith-space/2.0, , 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)