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.
// d88尊龙官网手机app 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!
}
}
