swift 第四课
Posted user_bo
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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
import Foundation import UIKit
/*
枚举 设置 图片的位置
*/ enum ButtonImagePosition : Int{ case PositionTop = 0 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, 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; } }
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