Swift扩展UIColor方法支持十六进制字符串获取颜色及自适应黑暗模式（一）
【下一篇 】→ iOS - Swift扩展UIColor类属性自适应黑暗模式颜色（二）
从十六进制字符串获取颜色
///从十六进制字符串获取颜色，
///color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式
class func hex(hexString: String, alpha:CGFloat) -> UIColor {
//删除字符串中的空格
var cString: String = hexString.trimmingCharacters(in: .whitespacesAndNewlines)
// String should be 6 or 8 characters
if cString.count < 6 { return UIColor.clear}
// strip 0X if it appears
//如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
let index = cString.index(cString.endIndex, offsetBy: -6)
let subString = cString[index...]
if cString.hasPrefix("0X") { cString = String(subString) }
//如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
if cString.hasPrefix("#") { cString = String(subString) }
if cString.count != 6 { return UIColor.clear }
// Separate into r, g, b substrings
var range: NSRange = NSMakeRange(0, 2)
//r
let rString = (cString as NSString).substring(with: range)
//g
range.location = 2
let gString = (cString as NSString).substring(with: range)
//b
range.location = 4
let bString = (cString as NSString).substring(with: range)
// Scan values
var r: UInt32 = 0x0
var g: UInt32 = 0x0
var b: UInt32 = 0x0
Scanner(string: rString).scanHexInt32(&r)
Scanner(string: gString).scanHexInt32(&g)
Scanner(string: bString).scanHexInt32(&b)
return UIColor(r: r, g: g, b: b, a:alpha)
}
将颜色实例转化为十六进制字符串
func hexString() -> String{
var color = self
if color.cgColor.numberOfComponents < 4 {
let components = color.cgColor.components
color = UIColor(red:components![0], green: components![0], blue: components![0], alpha: components![1])
}
if color.cgColor.colorSpace?.model != CGColorSpaceModel.rgb{
return "#FFFFFF"
}
return String(format: "#%02X%02X%02X",
(color.cgColor.components?[0])!*255.0,
(color.cgColor.components?[1])!*255.0,
(color.cgColor.components?[2])!*255.0)
}
生成随机色
//生成随机色
class var random: UIColor {
return UIColor(r: arc4random_uniform(256),
g: arc4random_uniform(256),
b: arc4random_uniform(256))
}
自适应黑暗模式的颜色适配方法
///返回根据当前显示模式的color
///
/// - Parameters:
/// - lightHex: lightColor 十六进制字符串
/// - darkHex: darkColor 十六进制字符串
func AutoFitHexColor(lightHex:String, darkHex:String) -> UIColor {
if #available(iOS 13.0, *){
let color = UIColor.init{trainCollection -> UIColor in
if trainCollection.userInterfaceStyle == UIUserInterfaceStyle.dark{
return UIColor.hex(hexString: darkHex)
}else {
return UIColor.hex(hexString: lightHex)
}
}
return color
}else {
return UIColor.hex(hexString: lightHex)
}
}
///返回根据当前显示模式的color
///
/// - Parameters:
/// - lightColor: UIColor 实例
/// - darkColor: UIColor 实例
func AutoFitColor(lightColor:UIColor, darkColor:UIColor) -> UIColor {
if #available(iOS 13.0, *){
let color = UIColor.init{trainCollection -> UIColor in
if trainCollection.userInterfaceStyle == UIUserInterfaceStyle.dark{
return darkColor
}else {
return lightColor
}
}
return color
}else {
return lightColor
}
}
我封装的UIColor+HEX.swift
//
// UIColor+HEX.swift
// Comic
//
// Created by 荣生 on 2022/4/23.
//
import UIKit
///从十六进制字符串获取颜色，
///color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式
func HexColor(hex:String,alpha:CGFloat = 1.0) -> UIColor {
return UIColor.hex(hexString: hex, alpha: alpha)
}
func RGBAColor(red: CGFloat, green: CGFloat, blue: CGFloat, alpha: CGFloat) -> UIColor {
return UIColor.init(red: red, green: green, blue: blue, alpha: alpha)
}
///返回根据当前显示模式的color
func AutoFitHexColor(lightHex:String, darkHex:String) -> UIColor {
if #available(iOS 13.0, *){
let color = UIColor.init{trainCollection -> UIColor in
if trainCollection.userInterfaceStyle == UIUserInterfaceStyle.dark{
return UIColor.hex(hexString: darkHex)
}else {
return UIColor.hex(hexString: lightHex)
}
}
return color
}else {
return UIColor.hex(hexString: lightHex)
}
}
///返回根据当前模式的color
func AutoFitColor(lightColor:UIColor, darkColor:UIColor) -> UIColor {
if #available(iOS 13.0, *){
let color = UIColor.init{trainCollection -> UIColor in
if trainCollection.userInterfaceStyle == UIUserInterfaceStyle.dark{
return darkColor
}else {
return lightColor
}
}
return color
}else {
return lightColor
}
}
//扩展UIColor
extension UIColor {
convenience init(r:UInt32 ,g:UInt32 , b:UInt32 , a:CGFloat = 1.0) {
self.init(red: CGFloat(r) / 255.0,
green: CGFloat(g) / 255.0,
blue: CGFloat(b) / 255.0,
alpha: a)
}
//生成随机色
class var random: UIColor {
return UIColor(r: arc4random_uniform(256),
g: arc4random_uniform(256),
b: arc4random_uniform(256))
}
//生成纯色图片
func image() -> UIImage {
let rect = CGRect(x: 0, y: 0, width: 1, height: 1)
UIGraphicsBeginImageContext(rect.size)
let context = UIGraphicsGetCurrentContext()
context!.setFillColor(self.cgColor)
context!.fill(rect)
let image = UIGraphicsGetImageFromCurrentImageContext()
UIGraphicsEndImageContext()
return image!
}
///从十六进制字符串获取颜色，
///color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式
class func hex(hexString: String, alpha:CGFloat) -> UIColor {
//删除字符串中的空格
var cString: String = hexString.trimmingCharacters(in: .whitespacesAndNewlines)
// String should be 6 or 8 characters
if cString.count < 6 { return UIColor.clear}
// strip 0X if it appears
//如果是0x开头的，那么截取字符串，字符串从索引为2的位置开始，一直到末尾
let index = cString.index(cString.endIndex, offsetBy: -6)
let subString = cString[index...]
if cString.hasPrefix("0X") { cString = String(subString) }
//如果是#开头的，那么截取字符串，字符串从索引为1的位置开始，一直到末尾
if cString.hasPrefix("#") { cString = String(subString) }
if cString.count != 6 { return UIColor.clear }
// Separate into r, g, b substrings
var range: NSRange = NSMakeRange(0, 2)
//r
let rString = (cString as NSString).substring(with: range)
//g
range.location = 2
let gString = (cString as NSString).substring(with: range)
//b
range.location = 4
let bString = (cString as NSString).substring(with: range)
// Scan values
var r: UInt32 = 0x0
var g: UInt32 = 0x0
var b: UInt32 = 0x0
Scanner(string: rString).scanHexInt32(&r)
Scanner(string: gString).scanHexInt32(&g)
Scanner(string: bString).scanHexInt32(&b)
return UIColor(r: r, g: g, b: b, a:alpha)
}
///从十六进制字符串获取颜色，
///color:支持@“#123456”、 @“0X123456”、 @“123456”三种格式
class func hex(hexString: String) -> UIColor {
return UIColor.hex(hexString: hexString, alpha: 1.0)
}
func hexString() -> String{
var color = self
if color.cgColor.numberOfComponents < 4 {
let components = color.cgColor.components
color = UIColor(red:components![0], green: components![0], blue: components![0], alpha: components![1])
}
if color.cgColor.colorSpace?.model != CGColorSpaceModel.rgb{
return "#FFFFFF"
}
return String(format: "#%02X%02X%02X",
(color.cgColor.components?[0])!*255.0,
(color.cgColor.components?[1])!*255.0,
(color.cgColor.components?[2])!*255.0)
}
}