如何将UIColor转换为HEX并在NSLog中显示 [英] How to convert UIColor to HEX and display in NSLog

问题描述

我已经检查了几个如何将UIColor代码转换为HEX的链接但是我不确定如何调用该方法在NSLog中显示它们。我没有得到评论的声誉，因此发布问题是我的最后手段。 我希望在日志中运行我的应用时显示。

I have checked several links on how to convert UIColor codes to HEX however I am not sure on how to call to the method to display them in NSLog. I haven't got the reputation to comment so posting as a question is my last resort. I want it to display when I run my app in the log.

其次，我在哪里输入RGB颜色编号（R = 30 ，G = 171，B = 13）？我看到所有的例子都使用Array [0]，[1]，[2]，它们通常是指索引位置，那么我在哪里添加颜色值？

Second, where do I input the RGB color number ( R = 30, G = 171, B = 13)? I see that all examples use Array [0], [1], [2] which normally refers to index position, so where do I add the color values?

I有这样的代码：

- (NSString *) hexFromUIColor:(UIColor *)color {

    if (CGColorGetNumberOfComponents(color.CGColor) < 4) {
        const CGFloat *components = CGColorGetComponents(color.CGColor);
        color = [UIColor colorWithRed:components[30] green:components[141] blue:components[13] alpha:components[1]];
    }
    if (CGColorSpaceGetModel(CGColorGetColorSpace(color.CGColor)) != kCGColorSpaceModelRGB) {
        return [NSString stringWithFormat:@"#FFFFFF"];
    }
    return [NSString stringWithFormat:@"#%02X%02X%02X", (int)((CGColorGetComponents(color.CGColor))[0]*255.0), (int)((CGColorGetComponents(color.CGColor))[1]*255.0), (int)((CGColorGetComponents(color.CGColor))[2]*255.0)];

}

我检查的链接：

uicolor的十六进制颜色

如何转换HEX RGB颜色代码到UIColor？

我试图在viewDidLoad中调用该方法，但是如果没有UIColor它将无法工作。我确信这很简单。

I have tried to call the method in viewDidLoad however it wont work without UIColor. I am sure it's something simple.

感谢有人回答。

我在viewDidLoad中使用的代码是什么来调用此方法为了在NSLog中显示？

What is the code I use in my viewDidLoad to call to this method in order to display in NSLog?

推荐答案

使用以下代码：

- (NSString *)hexStringFromColor:(UIColor *)color {
    const CGFloat *components = CGColorGetComponents(color.CGColor);

    CGFloat r = components[0];
    CGFloat g = components[1];
    CGFloat b = components[2];

    return [NSString stringWithFormat:@"#%02lX%02lX%02lX",
            lroundf(r * 255),
            lroundf(g * 255),
            lroundf(b * 255)];
}

获取十六进制代码字符串后，调用以下方法获取 UIColor

After getting hex code string, Call below method to get UIColor

- (UIColor *) colorWithHexString: (NSString *) hexString
{
    NSString *colorString = [[hexString stringByReplacingOccurrencesOfString: @"#" withString: @""] uppercaseString];

    NSLog(@"colorString :%@",colorString);
    CGFloat alpha, red, blue, green;

    // #RGB
    alpha = 1.0f;
    red   = [self colorComponentFrom: colorString start: 0 length: 2];
    green = [self colorComponentFrom: colorString start: 2 length: 2];
    blue  = [self colorComponentFrom: colorString start: 4 length: 2];

    return [UIColor colorWithRed: red green: green blue: blue alpha: alpha];
}

`

- (CGFloat) colorComponentFrom: (NSString *) string start: (NSUInteger) start length: (NSUInteger) length {
    NSString *substring = [string substringWithRange: NSMakeRange(start, length)];
    NSString *fullHex = length == 2 ? substring : [NSString stringWithFormat: @"%@%@", substring, substring];
    unsigned hexComponent;
    [[NSScanner scannerWithString: fullHex] scanHexInt: &hexComponent];
    return hexComponent / 255.0;
}

USAGE

USAGE

// ( R = 30, G = 171, B = 13)? 
CGFloat red = 30.0;
CGFloat green = 171.0;
CGFloat blue = 13.0; 
CGFloat alpha = 255.0
UIColor *color = [UIColor colorWithRed:(red/255.0) green:(green/255.0) blue:(blue/255.0) alpha:(alpha/255.0)];
NSString *colorCode = [self hexStringFromColor:color];
NSLog(@"Color Code: %@", colorCode);

UIColor *resultColor = [self colorWithHexString:colorCode];

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