如何将十六进制转换为RGB
Posted
技术标签:
【中文标题】如何将十六进制转换为RGB【英文标题】：how to convert hexadecimal to RGB 【发布时间】：2011-05-14 23:45:29 【问题描述】：我想进行从十六进制到 RGB 的转换，但是十六进制处理的是像 #FFFFFF 这样的字符串。我该怎么做？
【问题讨论】：
你能指定语言吗？ 对不起，我已经编辑过了。它在目标 C 中 也可以看看：***.com/questions/3723846 和 ***.com/questions/3010216/… 很高兴寻找合作伙伴来开发具有新创意的应用程序 使用这个colorcode.globalmaverick.com 【参考方案1】：我刚刚为您扩展了我的 UIColor 类别。
像UIColor *green = [UIColor colorWithHexString:@"#00FF00"];一样使用它
//
// UIColor_Categories.h
//
// Created by Matthias Bauch on 24.11.10.
// Copyright 2010 Matthias Bauch. All rights reserved.
//
#import <Foundation/Foundation.h>
@interface UIColor(MBCategory)
+ (UIColor *)colorWithHex:(UInt32)col;
+ (UIColor *)colorWithHexString:(NSString *)str;
@end
//
// UIColor_Categories.m
//
// Created by Matthias Bauch on 24.11.10.
// Copyright 2010 Matthias Bauch. All rights reserved.
//
#import "UIColor_Categories.h"
@implementation UIColor(MBCategory)
// takes @"#123456"
+ (UIColor *)colorWithHexString:(NSString *)str
const char *cStr = [str cStringUsingEncoding:NSASCIIStringEncoding];
long x = strtol(cStr+1, NULL, 16);
return [UIColor colorWithHex:x];
// takes 0x123456
+ (UIColor *)colorWithHex:(UInt32)col
unsigned char r, g, b;
b = col & 0xFF;
g = (col >> 8) & 0xFF;
r = (col >> 16) & 0xFF;
return [UIColor colorWithRed:(float)r/255.0f green:(float)g/255.0f blue:(float)b/255.0f alpha:1];
@end
【讨论】：
我知道这已经过时了，但我相信你必须 #import//In your header file
#define UIColorFromRGB(rgbValue) [UIColor colorWithRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
//usage
UIColor *color = UIColorFromRGB(0x000000)
//you can also use it inline
[text.textField setTextColor:UIColorFromRGB(0xcccccc)];
【讨论】：
我认为这很棒:) 这没有给出正确的结果。试试这个“#FFA300”来测试方法。【参考方案3】：斯威夫特
很有用
extension UIColor
convenience init(hexString: String)
let hex = hexString.trimmingCharacters(in: CharacterSet.alphanumerics.inverted)
var int = UInt32()
Scanner(string: hex).scanHexInt32(&int)
let a, r, g, b: UInt32
switch hex.count
case 3: // RGB (12-bit)
(a, r, g, b) = (255, (int >> 8) * 17, (int >> 4 & 0xF) * 17, (int & 0xF) * 17)
case 6: // RGB (24-bit)
(a, r, g, b) = (255, int >> 16, int >> 8 & 0xFF, int & 0xFF)
case 8: // ARGB (32-bit)
(a, r, g, b) = (int >> 24, int >> 16 & 0xFF, int >> 8 & 0xFF, int & 0xFF)
default:
(a, r, g, b) = (1, 1, 1, 0)
self.init(red: CGFloat(r) / 255, green: CGFloat(g) / 255, blue: CGFloat(b) / 255, alpha: CGFloat(a) / 255)
public func hexStringWithAlpha(_ includeAlpha: Bool) -> String
var r: CGFloat = 0
var g: CGFloat = 0
var b: CGFloat = 0
var a: CGFloat = 0
self.getRed(&r, green: &g, blue: &b, alpha: &a)
if (includeAlpha)
return String(format: "%02X%02X%02X%02X", Int(r * 255), Int(g * 255), Int(b * 255), Int(a * 255))
else
return String(format: "%02X%02X%02X", Int(r * 255), Int(g * 255), Int(b * 255))
open override var description: String
return self.hexStringWithAlpha(true)
open override var debugDescription: String
return self.hexStringWithAlpha(true)
Obj-C
UIColor *organizationColor = [self colorWithHexString:@"#ababab" alpha:1];
- (UIColor *)colorWithHexString:(NSString *)str_HEX alpha:(CGFloat)alpha_range
int red = 0;
int green = 0;
int blue = 0;
sscanf([str_HEX UTF8String], "#%02X%02X%02X", &red, &green, &blue);
return [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:alpha_range];
【讨论】：
【参考方案4】：根据以下答案。对于 SwiftUI，您可以这样做：
extension Color
init(hex: Int)
let red = (Double)((hex & 0xFF0000) >> 16) / 255.0
let green = (Double)((hex & 0xFF00) >> 8) / 255.0
let blue = (Double)((hex & 0xFF)) / 255.0
self.init(red: red, green: green, blue: blue, opacity: 1.0)
【讨论】：
以上是关于如何将十六进制转换为RGB的主要内容，如果未能解决你的问题，请参考以下文章