swift 中 UIColor 的一个简单扩展 UIColor+Extension
发布时间:2020-12-14 06:25:12 所属栏目:百科 来源:网络整理
导读:完整代码 import Foundationimport UIKitextension UIColor { convenience init(r : CGFloat,g : CGFloat,b : CGFloat){ self.init(red: r/255.0,green: g/255.0,blue: b/255.0,alpha: 1.0); } //简化RGB颜色写法 class func RGBA(_ r : UInt,g : UInt,b : U
完整代码 import Foundation import UIKit extension UIColor { convenience init(r : CGFloat,g : CGFloat,b : CGFloat){ self.init(red: r/255.0,green: g/255.0,blue: b/255.0,alpha: 1.0); } //简化RGB颜色写法 class func RGBA(_ r : UInt,g : UInt,b : UInt,a : CGFloat) -> UIColor { let redFloat = CGFloat(r) / 255.0 let green = CGFloat(g) / 255.0 let blue = CGFloat(b) / 255.0 return UIColor(red: redFloat,green: green,blue: blue,alpha: a) } //随机色 class func randomColor() -> UIColor { return UIColor(r: CGFloat(arc4random_uniform(256)),g: CGFloat(arc4random_uniform(256)),b: CGFloat(arc4random_uniform(256))); } //16进制颜色 class func colorWithHexString(_ hex: String,alpha : CGFloat = 1.0) -> UIColor { var hex = hex if hex.hasPrefix("#") { hex = hex.substring(from: hex.characters.index(hex.startIndex,offsetBy: 1)) } // Deal with 3 character Hex strings if hex.characters.count == 3 { let redHex = hex.substring(to: hex.characters.index(hex.startIndex,offsetBy: 1)) let greenHex = hex.substring(with: (hex.characters.index(hex.startIndex,offsetBy: 1) ..< hex.characters.index(hex.startIndex,offsetBy: 2))) let blueHex = hex.substring(from: hex.characters.index(hex.startIndex,offsetBy: 2)) hex = redHex + redHex + greenHex + greenHex + blueHex + blueHex } let redHex = hex.substring(to: hex.characters.index(hex.startIndex,offsetBy: 2)) let greenHex = hex.substring(with: (hex.characters.index(hex.startIndex,offsetBy: 2) ..< hex.characters.index(hex.startIndex,offsetBy: 4))) let blueHex = hex.substring(with: (hex.characters.index(hex.startIndex,offsetBy: 4) ..< hex.characters.index(hex.startIndex,offsetBy: 6))) var redInt: CUnsignedInt = 0 var greenInt: CUnsignedInt = 0 var blueInt: CUnsignedInt = 0 Scanner(string: redHex).scanHexInt32(&redInt) Scanner(string: greenHex).scanHexInt32(&greenInt) Scanner(string: blueHex).scanHexInt32(&blueInt) return UIColor(red: CGFloat(redInt) / 255.0,green: CGFloat(greenInt) / 255.0,blue: CGFloat(blueInt) / 255.0,alpha: CGFloat(alpha)) } }
使用举例 RGBA tableView.backgroundColor = UIColor.RGBA(53,g: 46,b: 54,a: 1) 十六进制颜色 self.tabBarController?.tabBar.barTintColor = UIColor.colorWithHexString("#252122") (编辑:李大同) 【声明】本站内容均来自网络,其相关言论仅代表作者个人观点,不代表本站立场。若无意侵犯到您的权利,请及时与联系站长删除相关内容! |