Making RGB color in Xcode

Question

I am using RGB values of a color from Photoshop and using the same in Xcode the values are Color-R-160 G-97 B-5   the color in Photoshop appears yellowish but in Xcode when I used  myLabel textColor    UIColor colorWithRed 160 green 97 blue 5 alpha 1      the color appears whitish   Why this difference is happening

User · Accepted Answer

Objective-C

You have to give the values between 0 and 1.0. So divide the RGB values by 255.

myLabel.textColor= [UIColor colorWithRed:(160/255.0) green:(97/255.0) blue:(5/255.0) alpha:1] ;

Update:

You can also use this macro

#define Rgb2UIColor(r, g, b)  [UIColor colorWithRed:((r) / 255.0) green:((g) / 255.0) blue:((b) / 255.0) alpha:1.0]

and you can call in any of your class like this

 myLabel.textColor = Rgb2UIColor(160, 97, 5);

Swift

This is the normal color synax

myLabel.textColor = UIColor(red: (160/255.0), green: (97/255.0), blue: (5/255.0), alpha: 1.0) 
//The values should be between 0 to 1

Swift is not much friendly with macros

Complex macros are used in C and Objective-C but have no counterpart in Swift. Complex macros are macros that do not define constants, including parenthesized, function-like macros. You use complex macros in C and Objective-C to avoid type-checking constraints or to avoid retyping large amounts of boilerplate code. However, macros can make debugging and refactoring difficult. In Swift, you can use functions and generics to achieve the same results without any compromises. Therefore, the complex macros that are in C and Objective-C source files are not made available to your Swift code.

So we use extension for this

extension UIColor {
    convenience init(_ r: Double,_ g: Double,_ b: Double,_ a: Double) {
        self.init(red: r/255, green: g/255, blue: b/255, alpha: a)
    }
}

You can use it like

myLabel.textColor = UIColor(160.0, 97.0, 5.0, 1.0)

User · Answer

Yeah ios supports RGB valur to range between 0 and 1 only  its close Range  0 1

User · Answer

You already got the right answer  but if you dislike the UIColor interface like me  you can do this    import  UIColor Helper h         myLabel textColor    UIColor colorWithRGBA 0xA06105FF     UIColor Helper h    import  lt UIKit UIKit h gt    interface UIColor  Helper     UIColor   colorWithRGBA  NSUInteger color   end   UIColor Helper m    import  UIColor Helper h    implementation UIColor  Helper      UIColor   colorWithRGBA  NSUInteger color       return  UIColor colorWithRed   color  gt  gt  24   amp  0xFF    255 0f                            green   color  gt  gt  16   amp  0xFF    255 0f                             blue   color  gt  gt  8   amp  0xFF    255 0f                            alpha   color   amp  0xFF    255 0f       end

User · Answer

The values are determined by the bit of the image  8 bit 0 to 255  16 bit   some ridiculous number  0 to 65 000 approx   32 bit are 0 to 1  I use  004 with 32 bit images   this gives 1 02 as a result when multiplied by 255

User · Answer

Color picker plugin for Interface Builder  There s a nice color picker from Panic which works well with IB  http   panic com  wade picker   Xcode plugin  This one gives you a GUI for choosing colors  http   www youtube com watch v eblRfDQM0Go  Objective-C  UIColor  color    UIColor colorWithRed  160 255 0  green  97 255 0  blue  5 255 0  alpha 1 0     Swift  let color   UIColor red  160 255  green  97 255  blue  5 255  alpha  1 0    Pods and libraries  There s a nice pod named MPColorTools  https   github com marzapower MPColorTools

[ios] Making RGB color in Xcode

Objective-C

Swift

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