Making RGB color in Xcode
IosObjective CUicolorIos Problem Overview
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?
Ios Solutions
Solution 1 - Ios
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)
Solution 2 - Ios
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 <UIKit/UIKit.h>
@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 >> 24) & 0xFF) / 255.0f
green:((color >> 16) & 0xFF) / 255.0f
blue:((color >> 8) & 0xFF) / 255.0f
alpha:((color) & 0xFF) / 255.0f];
}
@end
Solution 3 - Ios
Yeah.ios supports RGB valur to range between 0 and 1 only..its close Range [0,1]
Solution 4 - Ios
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
Solution 5 - Ios
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