Swift繪制漸變色的方法
更新時間：2021年08月25日 15:51:31 作者：風淺月明
這篇文章主要為大家詳細介紹了Swift繪制漸變色的方法，文中示例代碼介紹的非常詳細，具有一定的參考價值，感興趣的小伙伴們可以參考一下
本文實例為大家分享了Swift繪制漸變色的具體代碼，供大家參考，具體內容如下
示意圖：
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添加漸變色
/// 方式一 代碼添加漸變色
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或代碼的方式添加漸變色.
這種方式有個缺點, 若是要對更多的視圖(比如UILabel)添加漸變色, 需要繼續(xù)創(chuàng)建一個子類繼承于它進行功能的拓展.
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,讓每個繼承于UIView的視圖都可以調用拓展的方法.
這種方式的缺點就是無法在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)
}
//將當前視圖轉為UIImage
func asImage() -> UIImage {
let renderer = UIGraphicsImageRenderer(bounds: bounds)
return renderer.image { rendererContext in
layer.render(in: rendererContext.cgContext)
}
}
}
Demo：繪制漸變色
以上就是本文的全部內容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。
您可能感興趣的文章:
相關文章
本篇文章主要介紹了Swift如何在應用中添加圖標更換功能的方法，小編覺得挺不錯的，現(xiàn)在分享給大家，也給大家做個參考。一起跟隨小編過來看看吧2018-02-02
Swift項目中利用SWRevealViewController實現(xiàn)側滑菜單
這篇文章主要介紹了Swift項目中利用SWRevealViewController實現(xiàn)側滑菜單,需要的朋友可以參考下2015-12-12
淺談Swift編程中switch與fallthrough語句的使用
這篇文章主要介紹了Swift編程中switch與fallthrough語句的使用,用于基本的流程控制,需要的朋友可以參考下2015-11-11
這篇文章主要介紹了Swift語言中的閉包機制,是Swift入門學習中的基礎知識,需要的朋友可以參考下2015-11-11
這篇文章主要給大家介紹了關于在swift4更新中所遇到的一些問題，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧。2017-12-12
Swift 將為所有屬性已提供默認值的且自身沒有定義任何構造器的結構體或基類，提供一個默認的構造器。這個默認構造器將簡單的創(chuàng)建一個所有屬性值都設置為默認值的實例。2014-11-11
這篇文章主要為大家介紹了Swift可選值優(yōu)化示例詳解，有需要的朋友可以借鑒參考下，希望能夠有所幫助，祝大家多多進步，早日升職加薪2023-06-06
這篇文章主要介紹了Swift中Optional值的鏈式調用學習筆記,Optional鏈是Swift入門學習中的基礎知識,需要的朋友可以參考下2016-07-07
函數(shù)相當重要的，下面這篇文章主要給大家介紹了關于Swift函數(shù)提前返回的相關資料，文中通過實例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧2018-09-09
Swift實現(xiàn)監(jiān)聽鍵盤通知及一些處理詳解
這篇文章主要給大家介紹了關于Swift實現(xiàn)監(jiān)聽鍵盤通知及一些處理的相關資料，文中通過示例代碼介紹的非常詳細，對大家的學習或者工作具有一定的參考學習價值，需要的朋友們下面隨著小編來一起學習學習吧。2018-01-01