Swift代码自定义UIView实现示例_Swift

Swift代码自定义UIView实现示例

2021-12-24 14:15Foreveroriginal Swift

这篇文章主要为大家介绍了Swift如何自定义UIView的实现示例代码，有需要的朋友可以借鉴参考下，希望能够有所帮助祝大家多多进步，早日升职加薪

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!

									    }

									}