Swift code custom UIView implementation example

The principles of Swift custom View and OC custom View are the same. Rewrite the init() method or initWithFrame() method. Here is a brief description of how to customize the swift UIView

Mainly rewrite the init (frame: CGRect) method, where required init?(coder aDecoder: NSCoder) is essential, and is mandatory by the swift language

//
//  
//  SmartMilk
//
//  Created by mac on 2017/6/9.
// Copyright © 2017 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(){
//        ()
//        setupSubViews()
//    }    
    override init(frame:CGRect){
        (frame: frame)
        setupSubViews()
    }    
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }    
    func setupSubViews() {        
        let frame = 
        //uiimageVIew
        headImgView = UIImageView(frame:CGRect(x:0,y:0,width:G_HEADIMAGE_HEIGHT,height:G_HEADIMAGE_HEIGHT))
        headImgView?.backgroundColor = 
        
        //uiTextField
        field = UITextField(frame:CGRect(x:0,y:0,width:100,height:G_HEADIMAGE_HEIGHT))
//        field?.font = (ofSize: 15)        
        //uiLabel        
        line = UILabel(frame: CGRect(x:0,y:-1,width:,height:1))
        line?.backgroundColor =         
        (headImgView!)
        (field!)
        (line!)
    }       
    override func layoutSubviews() {
        ()        
        let frame = 
        let imgY = ( - 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 =  - fieldx        
        field?.frame = CGRect(x: fieldx, y: imgY, width: fieldWidth, height: G_HEADIMAGE_HEIGHT)        
        //label
        var lineFrame = line?.frame
        lineFrame?. =  - 2
        lineFrame?. =         
        line?.frame = lineFrame!
        
    }
 
}

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