swift 第四課

標籤：ace   view   frame   contents   type   led   str   tsm   float   

項目中經常遇到按鈕改變文字和圖片位置的情況，所以嘗試寫一個 button 的分類

import Foundationimport UIKit
/*
枚舉 設定 圖片的位置
*/enum ButtonImagePosition : Int{     case PositionTop = 0    case Positionleft    case PositionBottom    case PositionRight}extension UIButton {
/**
imageName:圖片的名字
title：button 的名字
type ：image 的位置 
Space ：圖片文字之間的間距    
*/    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. 賦值        self.titleEdgeInsets = labelEdgeInsets;        self.imageEdgeInsets = imageEdgeInsets;    }}

 

swift 第四課