Swift如何自定义UIView

小编给大家分享一下Swift如何自定义UIView，相信大部分人都还不怎么了解，因此分享这篇文章给大家参考一下，希望大家阅读完这篇文章后大有收获，下面让我们一起去了解一下吧！

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

////  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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