macos 将十六进制颜色代码转换为 NSColor
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原文地址: http://stackoverflow.com/questions/8697205/
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Convert Hex Color Code to NSColor
提问by mdominick
I am having some trouble converting a a hexcode to an NSColor. Note this is for a Mac App (hence the NSColor instead of UIColor). This is the code I have so far:
我在将 aa 十六进制代码转换为 NSColor 时遇到了一些麻烦。请注意，这是针对 Mac 应用程序的（因此使用 NSColor 而不是 UIColor）。这是我到目前为止的代码：
- (NSColor *) createNSColorFromString:(NSString *)string {
NSString* hexNum = [string substringFromIndex:1];
NSColor* color = nil;
unsigned int colorCode = 0;
unsigned char red, green, blue;
if (string) {
NSScanner* scanner = [NSScanner scannerWithString:hexNum];
(void) [scanner scanHexInt:&colorCode];
}
red = (unsigned char) (colorCode >> 16);
green = (unsigned char) (colorCode >> 8);
blue = (unsigned char) (colorCode);
color = [NSColor colorWithCalibratedRed:(float)red / 0xff green:(float)green / 0xff blue:(float)blue / 0xff alpha:1.0];
return color;
}
}
Any help would be appreciated.
任何帮助，将不胜感激。
回答by Zlatan
+ (NSColor*)colorWithHexColorString:(NSString*)inColorString
{
NSColor* result = nil;
unsigned colorCode = 0;
unsigned char redByte, greenByte, blueByte;
if (nil != inColorString)
{
NSScanner* scanner = [NSScanner scannerWithString:inColorString];
(void) [scanner scanHexInt:&colorCode]; // ignore error
}
redByte = (unsigned char)(colorCode >> 16);
greenByte = (unsigned char)(colorCode >> 8);
blueByte = (unsigned char)(colorCode); // masks off high bits
result = [NSColor
colorWithCalibratedRed:(CGFloat)redByte / 0xff
green:(CGFloat)greenByte / 0xff
blue:(CGFloat)blueByte / 0xff
alpha:1.0];
return result;
}
It doesn't take alpha values into account, it assumes values like "FFAABB", but it would be easy to modify.
它不考虑 alpha 值，它假设像“FFAABB”这样的值，但很容易修改。
回答by serj
Here is two very useful macros
这是两个非常有用的宏
#define RGBA(r,g,b,a) [NSColor colorWithCalibratedRed:r/255.f green:g/255.f blue:b/255.f alpha:a/255.f]
#define NSColorFromRGB(rgbValue) [NSColor colorWithCalibratedRed:((float)((rgbValue & 0xFF0000) >> 16))/255.0 green:((float)((rgbValue & 0xFF00) >> 8))/255.0 blue:((float)(rgbValue & 0xFF))/255.0 alpha:1.0]
回答by Michael Dautermann
Here's the swift 2 compatible version of Zlatan's answer above (and +1 to him!):
这是上面 Zlatan 答案的 swift 2 兼容版本（对他+1！）：
func getColorFromString(webColorString : String) -> NSColor?
{
var result : NSColor? = nil
var colorCode : UInt32 = 0
var redByte, greenByte, blueByte : UInt8
// these two lines are for web color strings that start with a #
// -- as in #ABCDEF; remove if you don't have # in the string
let index1 = webColorString.endIndex.advancedBy(-6)
let substring1 = webColorString.substringFromIndex(index1)
let scanner = NSScanner(string: substring1)
let success = scanner.scanHexInt(&colorCode)
if success == true {
redByte = UInt8.init(truncatingBitPattern: (colorCode >> 16))
greenByte = UInt8.init(truncatingBitPattern: (colorCode >> 8))
blueByte = UInt8.init(truncatingBitPattern: colorCode) // masks off high bits
result = NSColor(calibratedRed: CGFloat(redByte) / 0xff, green: CGFloat(greenByte) / 0xff, blue: CGFloat(blueByte) / 0xff, alpha: 1.0)
}
return result
}
回答by eonist
Support for 7 hex types:
支持 7 种十六进制类型：
NSColorParser.nsColor("#FF0000",1)//red nsColor
NSColorParser.nsColor("FF0",1)//red nsColor
NSColorParser.nsColor("0xFF0000",1)//red nsColor
NSColorParser.nsColor("#FF0000",1)//red nsColor
NSColorParser.nsColor("FF0000",1)//red nsColor
NSColorParser.nsColor(0xFF0000,1)//red nsColor
NSColorParser.nsColor(16711935,1)//red nsColor
http://stylekit.org/blog/2015/11/09/Supporting-7-Hex-color-types/
http://stylekit.org/blog/2015/11/09/Supporting-7-Hex-color-types/
NOTE:This isn't plug and play, you have to dig a little in the code. But its all there and its probably faster than rolling your own.
注意：这不是即插即用，您必须深入了解代码。但它就在那里，它可能比滚动你自己的更快。
