Swift绘制渐变色的方法

 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) } }

 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) } } }

 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) } } }