Swift自定义View和OC自定义View的原理都是一样的，重写init()方法或initWithFrame()方法，下面简单说说如何自定义swift UIView
主要是重写init（frame：CGRect)方法，其中required init?(coder aDecoder: NSCoder) 是必不可少的，swift语言强制要求的
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//// LoginImgFieldView.swift// SmartMilk//// Created by mac on 2017/6/9.// Copyright © 2017年 mac. All rights reserved.//import UIKit let G_HEADIMAGE_HEIGHT:CGFloat = 30 class LoginImgFieldView: UIView { var headImgView:UIImageView? var field:UITextField? var line:UILabel? /* // Only override draw() if you perform custom drawing. // An empty implementation adversely affects performance during animation. override func draw(_ rect: CGRect) { // Drawing code } */// override init(){// super.init()// setupSubViews()// } override init(frame:CGRect){ super.init(frame: frame) setupSubViews() } required init?(coder aDecoder: NSCoder) { fatalError("init(coder:) has not been implemented") } func setupSubViews() { let frame = self.bounds //uiimageVIew headImgView = UIImageView(frame:CGRect(x:0,y:0,width:G_HEADIMAGE_HEIGHT,height:G_HEADIMAGE_HEIGHT)) headImgView?.backgroundColor = UIColor.blue //uiTextField field = UITextField(frame:CGRect(x:0,y:0,width:100,height:G_HEADIMAGE_HEIGHT))// field?.font = UIFont.systemFont(ofSize: 15) //uiLabel line = UILabel(frame: CGRect(x:0,y:frame.size.height-1,width:frame.size.width,height:1)) line?.backgroundColor = UIColor.orange self.addSubview(headImgView!) self.addSubview(field!) self.addSubview(line!) } override func layoutSubviews() { super.layoutSubviews() let frame = self.bounds let imgY = (frame.size.height - G_HEADIMAGE_HEIGHT)/2 headImgView?.frame = CGRect(x:0,y:imgY,width:G_HEADIMAGE_HEIGHT,height:G_HEADIMAGE_HEIGHT) //field let fieldx = G_HEADIMAGE_HEIGHT+5 let fieldWidth = frame.size.width - fieldx field?.frame = CGRect(x: fieldx, y: imgY, width: fieldWidth, height: G_HEADIMAGE_HEIGHT) //label var lineFrame = line?.frame lineFrame?.origin.y = frame.size.height - 2 lineFrame?.size.width = frame.size.width line?.frame = lineFrame! } } |
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原文链接：https://blog.csdn.net/moqj_123/article/details/73351098
