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//
// backgroundlineview.swift
// linebackgroundview
//
// created by youxianming on 16/8/14.
// copyright © 2016年 youxianming. all rights reserved.
//
import uikit
// mark: public class : backgroundlineview
class backgroundlineview: uiview {
// mark: properties.
/// line width, default is 5.
var linewidth : cgfloat {
get {return backgroundview.linewidth}
set(newval) {
backgroundview.linewidth = newval
backgroundview.setneedsdisplay()
}
}
/// line gap, default is 3.
var linegap : cgfloat {
get {return backgroundview.linegap}
set(newval) {
backgroundview.linegap = newval
backgroundview.setneedsdisplay()
}
}
/// line color, default is graycolor.
var linecolor : uicolor {
get {return backgroundview.linecolor}
set(newval) {
backgroundview.linecolor = newval
backgroundview.setneedsdisplay()
}
}
/// rotate value, default is 0.
var rotate : cgfloat {
get {return backgroundview.rotate}
set(newval) {
backgroundview.rotate = newval
backgroundview.setneedsdisplay()
}
}
convenience init(frame: cgrect, linewidth : cgfloat, linegap : cgfloat, linecolor : uicolor, rotate : cgfloat) {
self.init(frame : frame)
self.linewidth = linewidth
self.linegap = linegap
self.linecolor = linecolor
self.rotate = rotate
}
// mark: override system method.
override func layoutsubviews() {
super.layoutsubviews()
setupbackgroundview()
}
override init(frame: cgrect) {
super.init(frame: frame)
self.layer.maskstobounds = true
self.addsubview(backgroundview)
}
required init?(coder adecoder: nscoder) {
fatalerror("init(coder:) has not been implemented")
}
// mark: private value & func.
private let backgroundview = linebackground(length: 0)
private func setupbackgroundview() {
let drawlength = sqrt(self.bounds.size.width * self.bounds.size.width + self.bounds.size.height * self.bounds.size.height)
backgroundview.frame = cgrectmake(0, 0, drawlength, drawlength)
backgroundview.center = cgpointmake(self.bounds.size.width / 2.0, self.bounds.size.height / 2.0)
backgroundview.setneedsdisplay()
}
}
// mark: private class : linebackground
private class linebackground : uiview {
private var rotate : cgfloat = 0
private var linewidth : cgfloat = 5
private var linegap : cgfloat = 3
private var linecolor : uicolor = uicolor.graycolor()
override init(frame: cgrect) {
super.init(frame: frame)
self.backgroundcolor = uicolor.clearcolor()
}
required init?(coder adecoder: nscoder) {
fatalerror("init(coder:) has not been implemented")
}
convenience init(length : cgfloat) {
self.init(frame : cgrectmake(0, 0, length, length))
}
override func drawrect(rect: cgrect) {
super.drawrect(rect)
if self.bounds.size.width <= 0 || self.bounds.size.height <= 0 {
return
}
let context = uigraphicsgetcurrentcontext()
let width = self.bounds.size.width
let height = self.bounds.size.width
let drawlength = sqrt(width * width + height * height)
let outerx = (drawlength - width) / 2.0
let outery = (drawlength - height) / 2.0
let tmplinewidth = linewidth <= 0 ? 5 : linewidth
let tmplinegap = linegap <= 0 ? 3 : linegap
var red : cgfloat = 0
var green : cgfloat = 0
var blue : cgfloat = 0
var alpha : cgfloat = 0
cgcontexttranslatectm(context, 0.5 * drawlength, 0.5 * drawlength)
cgcontextrotatectm(context, rotate)
cgcontexttranslatectm(context, -0.5 * drawlength, -0.5 * drawlength)
linecolor.getred(&red, green: &green, blue: &blue, alpha: &alpha)
cgcontextsetrgbfillcolor(context, red, green, blue, alpha)
var currentx = -outerx
while currentx < drawlength {
cgcontextaddrect(context, cgrectmake(currentx, -outery, tmplinewidth, drawlength))
currentx += tmplinewidth + tmplinegap
}
cgcontextfillpath(context)
}
}
使用
//
// viewcontroller.swift
// linebackgroundview
//
// created by youxianming on 16/8/14.
// copyright © 2016年 youxianming. all rights reserved.
//
import uikit
class viewcontroller: uiviewcontroller {
let tmpview = backgroundlineview(frame: cgrectmake(0, 0, 300, 300), linewidth: 4, linegap: 4,
linecolor: uicolor.blackcolor().colorwithalphacomponent(0.045), rotate: cgfloat(m_pi_4))
override func viewdidload() {
super.viewdidload()
tmpview.center = self.view.center
self.view.addsubview(tmpview)
}
}
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