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：
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import foundationimport 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.
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import foundationimport 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
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import foundationimport 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：https://github.com/Gamin-fzym/GAGradientRampDemo.git
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服务器之家。
原文链接：https://blog.csdn.net/wsyx768/article/details/119422014
