RGB 값에서 UIColor를 올바르게 초기화하는 방법은 무엇입니까?

RGB 값에서 UIColor를 올바르게 초기화하는 방법은 무엇입니까?

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다양한 색상을 사용하는 iPhone 응용 프로그램에서 작업 중입니다. 사용자가 특정 색상 버튼을 선택하면 그에 따라 그리기 색상을 설정합니다. 나는 일부 색상을 얻었지만 대부분의 경우 흰색을 얻습니다.

내 코드는 다음과 같습니다.

-(IBAction)colorSelected:(UIButton *)sender
{

switch (sender.tag) 
{
    case 1:
        self.drawcolor= [UIColor colorWithRed:200 green:191 blue:231 alpha:1];
        break;            
    case 2:
        self.drawcolor= [UIColor colorWithRed:163 green:73 blue:164 alpha:1];
        break;  
    case 3:
        self.drawcolor= [UIColor colorWithRed:112 green:146 blue:76 alpha:1];
        break;  
    case 4:
        self.drawcolor= [UIColor colorWithRed:63 green:72 blue:204 alpha:1];
        break;  
    case 5:
        self.drawcolor= [UIColor colorWithRed:153 green:217 blue:234 alpha:1];
        break;  
    case 6:
        self.drawcolor= [UIColor colorWithRed:0 green:162 blue:232 alpha:1];
        break;          
    case 7:
        self.drawcolor= [UIColor colorWithRed:181 green:230 blue:29 alpha:1];
        break;  
    case 8:
        self.drawcolor= [UIColor colorWithRed:34 green:177 blue:76 alpha:1];
        break;          
    case 9:
        self.drawcolor= [UIColor colorWithRed:239 green:228 blue:176 alpha:1];
        break;          
    case 10:
        self.drawcolor= [UIColor colorWithRed:255 green:201 blue:0 alpha:1];
        break;          
    case 11:
        self.drawcolor= [UIColor colorWithRed:255 green:201 blue:14 alpha:1];
        break;          
    case 12:
        self.drawcolor= [UIColor colorWithRed:237 green:28 blue:36 alpha:1];
        break;          
    case 13:
        self.drawcolor= [UIColor colorWithRed:255 green:127 blue:39 alpha:1];
        break;          
    case 14:
        self.drawcolor= [UIColor colorWithRed:255 green:174 blue:201 alpha:1];
        break;          
    case 15:
        self.drawcolor= [UIColor colorWithRed:185 green:122 blue:87 alpha:1];
        break;          
    case 16:
        self.drawcolor= [UIColor colorWithRed:136 green:0 blue:21 alpha:1];
        break;          
    case 17:
        self.drawcolor= [UIColor colorWithRed:195 green:195 blue:195 alpha:1];
        break;          
    case 18:
        self.drawcolor= [UIColor colorWithRed:127 green:127 blue:127 alpha:1];
        break;          
    case 19:
        self.drawcolor= [UIColor colorWithRed:255 green:255 blue:255 alpha:1];
        break;
    case 20:
        self.drawcolor= [UIColor colorWithRed:0 green:0 blue:0 alpha:1];
        break;  
    default:
        break;
}

self.preColor=self.drawcolor;
self.lineWidth=self.prelineWidth;
}

아무도 내가 뭘 잘못하고 있는지 말해 줄 수 있습니까? Sumit

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값은에 0.0위해 1.0범위.

예를 들어으로 나누지 255.만 소수점을 기억하여 정수 나눗셈이 아닌 부동 소수점 나누기를 얻습니다.

처럼

selectedColor = [UIColor colorWithRed:14.0/255.0 green:114.0/255.0 blue:199.0/255.0 alpha:1];

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Swift를 사용한 실용적인 접근 방식 .

extension UIColor {

   convenience init(rgbColorCodeRed red: Int, green: Int, blue: Int, alpha: CGFloat) {

     let redPart: CGFloat = CGFloat(red) / 255
     let greenPart: CGFloat = CGFloat(green) / 255
     let bluePart: CGFloat = CGFloat(blue) / 255

     self.init(red: redPart, green: greenPart, blue: bluePart, alpha: alpha)

   }
}

---

몇 가지 옵션이 있습니다

암호

CGFloat red = 16.0;
CGFloat green = 97.0;
CGFloat blue = 5.0;
CGFloat alpha = 255.0;
UIColor *color = [UIColor colorWithRed:(red/255.0) green:(green/255.0) blue:(blue/255.0) alpha:(alpha/255.0)];

Interface Builder 용 색상 선택기 플러그인

IB와 잘 작동하는 Panic의 멋진 색상 선택기가 있습니다. http://panic.com/~wade/picker/

Xcode 플러그인

This one gives you a GUI for choosing colors: http://www.youtube.com/watch?v=eblRfDQM0Go

Pods and libraries

There's a nice pod named MPColorTools: https://github.com/marzapower/MPColorTools

---

Here is a method that you can easily turn into a category on UIColor that will allow you to specify a color based on RGBA values of 0 - 255.

+ (UIColor *)colorFromRGBAWithRed:(CGFloat)red green:(CGFloat)green blue:(CGFloat)blue alpha:(CGFloat)alpha {
    return [UIColor colorWithRed:red/255.0 green:green/255.0 blue:blue/255.0 alpha:alpha/255.0];
}

If you make it a UIColor category extension, you can use it like so:

UIColor *myAwesomeColor = [UIColor colorFromRGBAWithRed:48 green:119 blue:167 alpha:255];

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In Swift you can easily set your Background-Color for example of a cell like this:

cell.backgroundColor = UIColor.init(red: 14.0/255.0, green: 114.0/255.0, blue: 199.0/255.0, alpha: 1)

:-)

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(ContentView.Layer.BorderColor) //CG Object
   = UIColor.LightGray.CGColor; 

참고URL : https://stackoverflow.com/questions/8023916/how-to-initialize-uicolor-from-rgb-values-properly