本文实例为大家分享了swift绘制渐变色的具体代码，供大家参考，具体内容如下
示意图：
import foundation
import uikit
class gradientvc: uiviewcontroller {
@iboutlet weak var butone: gradientcustombutton!
@iboutlet weak var viewtwo: uiview!
override func viewdidload() {
super.viewdidload()
/// 方式一 xib添加渐变色
/// 方式一 代码添加渐变色
butone.isgradient = true
butone.startcolor = uicolor(hexstring: "#fd0134")!
butone.endcolor = uicolor(hexstring: "#007aff")!
butone.startpoint = cgpoint(x: 0,y: 0)
butone.endpoint = cgpoint(x: 1,y: 1)
/// 方式二
//viewtwo.addgradient(start_color: "#8238ff", end_color: "#007aff")
//viewtwo.layer.maskstobounds = true
viewtwo.addgradient(colors: [uicolor(hexstring: "#fd0134")!, uicolor(hexstring: "#007aff")!],
point: (cgpoint(x: 1.0, y: 0.0), cgpoint(x: 0.0, y: 1.0)),
frame: cgrect(x: 0, y: 0, width: uiscreen.main.bounds.width-40, height: 100),
radius: 0)
}
}
方式一：
使用xib或代码的方式添加渐变色.
这种方式有个缺点, 若是要对更多的视图(比如uilabel)添加渐变色, 需要继续创建一个子类继承于它进行功能的拓展.
import foundation
import uikit
class gradientcustomview: uiview {
@ibinspectable var isgradient: bool = false
@ibinspectable var startcolor: uicolor = .white
@ibinspectable var endcolor: uicolor = .white
@ibinspectable var locations: [nsnumber] = [0 , 1]
@ibinspectable var startpoint: cgpoint = .zero
@ibinspectable var endpoint: cgpoint = .zero
private var gradientbglayer: cagradientlayer?
override func layoutsubviews() {
super.layoutsubviews()
gradientbglayer?.removefromsuperlayer()
if isgradient {
gradientbglayer = cagradientlayer()
gradientbglayer!.colors = [startcolor.cgcolor, endcolor.cgcolor]
gradientbglayer!.locations = locations
gradientbglayer!.frame = bounds
gradientbglayer!.startpoint = startpoint
gradientbglayer!.endpoint = endpoint
self.layer.insertsublayer(gradientbglayer!, at: 0)
}
}
}
class gradientcustombutton: uibutton {
@ibinspectable var isgradient: bool = false
@ibinspectable var startcolor: uicolor = .white
@ibinspectable var endcolor: uicolor = .white
@ibinspectable var locations: [nsnumber] = [0 , 1]
@ibinspectable var startpoint: cgpoint = .zero
@ibinspectable var endpoint: cgpoint = .zero
private var gradientbglayer: cagradientlayer?
override func layoutsubviews() {
super.layoutsubviews()
gradientbglayer?.removefromsuperlayer()
if isgradient {
gradientbglayer = cagradientlayer()
gradientbglayer!.colors = [startcolor.cgcolor, endcolor.cgcolor]
gradientbglayer!.locations = locations
gradientbglayer!.frame = bounds
gradientbglayer!.startpoint = startpoint
gradientbglayer!.endpoint = endpoint
self.layer.insertsublayer(gradientbglayer!, at: 0)
}
}
}
方式二：
直接拓展uiview,让每个继承于uiview的视图都可以调用拓展的方法.
这种方式的缺点就是无法在xib中使用
import foundation
import uikit
extension uiview {
@discardableresult
func addgradient(colors: [uicolor],
point: (cgpoint, cgpoint) = (cgpoint(x: 0.5, y: 0), cgpoint(x: 0.5, y: 1)),
locations: [nsnumber] = [0, 1],
frame: cgrect = cgrect.zero,
radius: cgfloat = 0,
at: uint32 = 0) -> cagradientlayer {
let bglayer1 = cagradientlayer()
bglayer1.colors = colors.map { $0.cgcolor }
bglayer1.locations = locations
if frame == .zero {
bglayer1.frame = self.bounds
} else {
bglayer1.frame = frame
}
bglayer1.startpoint = point.0
bglayer1.endpoint = point.1
bglayer1.cornerradius = radius
self.layer.insertsublayer(bglayer1, at: at)
return bglayer1
}
func addgradient(start: cgpoint = cgpoint(x: 0.5, y: 0),
end: cgpoint = cgpoint(x: 0.5, y: 1),
colors: [uicolor],
locations: [nsnumber] = [0, 1],
frame: cgrect = cgrect.zero,
radius: cgfloat = 0,
at: uint32 = 0) {
let bglayer1 = cagradientlayer()
bglayer1.colors = colors.map { $0.cgcolor }
bglayer1.locations = locations
bglayer1.frame = frame
bglayer1.startpoint = start
bglayer1.endpoint = end
bglayer1.cornerradius = radius
self.layer.insertsublayer(bglayer1, at: at)
}
func addgradient(start_color:string,end_color : string,frame : cgrect?=nil,cornerradius : cgfloat?=0, at: uint32 = 0){
var bounds : cgrect = self.bounds
if let frame = frame {
bounds = frame
}
let bglayer1 = cagradientlayer()
bglayer1.colors = [uicolor(hexstring: start_color)!.cgcolor, uicolor(hexstring: end_color)!.cgcolor]
bglayer1.locations = [0, 1]
bglayer1.frame = bounds
bglayer1.startpoint = cgpoint(x: 0, y: 0.61)
bglayer1.endpoint = cgpoint(x: 0.61, y: 0.61)
bglayer1.cornerradius = cornerradius ?? 0
self.layer.insertsublayer(bglayer1, at: at)
}
func addgradient(start_color:string,
end_color : string,
frame : cgrect?=nil,
borader: cgfloat = 0,
boradercolor: uicolor = .clear,
at: uint32 = 0,
corners: uirectcorner?,
radius: cgfloat = 0) {
var bounds : cgrect = self.bounds
if let frame = frame {
bounds = frame
}
let bglayer1 = cagradientlayer()
bglayer1.colors = [uicolor(hexstring: start_color)!.cgcolor, uicolor(hexstring: end_color)!.cgcolor]
bglayer1.locations = [0, 1]
bglayer1.frame = bounds
bglayer1.startpoint = cgpoint(x: 0, y: 0.61)
bglayer1.endpoint = cgpoint(x: 0.61, y: 0.61)
bglayer1.bordercolor = boradercolor.cgcolor
bglayer1.borderwidth = borader
if corners != nil {
let cornerpath = uibezierpath(roundedrect: bounds, byroundingcorners: corners!, cornerradii: cgsize(width: radius, height: radius))
let radiuslayer = cashapelayer()
radiuslayer.frame = bounds
radiuslayer.path = cornerpath.cgpath
bglayer1.mask = radiuslayer
}
self.layer.insertsublayer(bglayer1, at: at)
}
func addgradient(startpoint: cgpoint = cgpoint(x: 0, y: 0.5),
start_color:string,
endpoint: cgpoint = cgpoint(x: 1, y: 0.5),
end_color : string,
frame : cgrect? = nil,
cornerradius : cgfloat?=0){
var bounds : cgrect = self.bounds
if let frame = frame {
bounds = frame
}
let bglayer1 = cagradientlayer()
bglayer1.frame = bounds
bglayer1.startpoint = startpoint
bglayer1.endpoint = endpoint
bglayer1.colors = [uicolor(hexstring: start_color)!.cgcolor, uicolor(hexstring: end_color)!.cgcolor]
bglayer1.locations = [0, 1]
bglayer1.cornerradius = cornerradius ?? 0
self.layer.addsublayer(bglayer1)
}
func addverticalgradient(start_color:string,end_color : string,frame : cgrect?=nil,cornerradius : cgfloat?=0){
var bounds : cgrect = self.bounds
if let frame = frame {
bounds = frame
}
let bglayer1 = cagradientlayer()
bglayer1.colors = [uicolor(hexstring: start_color)!.cgcolor, uicolor(hexstring: end_color)!.cgcolor]
bglayer1.locations = [0, 1]
bglayer1.frame = bounds
bglayer1.startpoint = cgpoint(x: 0.5, y: 0)
bglayer1.endpoint = cgpoint(x: 1, y: 1)
bglayer1.cornerradius = cornerradius ?? 0
self.layer.insertsublayer(bglayer1, at: 0)
}
//将当前视图转为uiimage
func asimage() -> uiimage {
let renderer = uigraphicsimagerenderer(bounds: bounds)
return renderer.image { renderercontext in
layer.render(in: renderercontext.cgcontext)
}
}
}
demo：绘制渐变色
以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持。
