ios 在 Xcode 中制作 RGB 颜色
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Making RGB color in Xcode
提问by amar
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
我正在使用来自 Photoshop 的颜色的 RGB 值，并在 Xcode 中使用相同的值。Color-R-160,G-97,B-5 ... Photoshop 中的颜色看起来偏黄，但在 Xcode 中使用时
myLabel.textColor = [UIColor colorWithRed:160 green:97 blue:5 alpha:1] ;
the color appears whitish.
颜色显得发白。
Why this difference is happening?
为什么会出现这种差异？
回答by iPrabu
Objective-C
目标-C
You have to give the values between 0 and 1.0. So divide the RGB values by 255.
您必须给出介于 0 和 1.0 之间的值。因此，将 RGB 值除以 255。
myLabel.textColor= [UIColor colorWithRed:(160/255.0) green:(97/255.0) blue:(5/255.0) alpha:1] ;
Update:
更新：
You can also use this macro
你也可以使用这个宏
#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
你可以像这样打电话给你的任何班级
myLabel.textColor = Rgb2UIColor(160, 97, 5);
Swift
迅速
This is the normal color synax
这是正常的颜色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
Swift 对宏不太友好
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.
复杂的宏在 C 和 Objective-C 中使用，但在 Swift 中没有对应的宏。复杂宏是不定义常量的宏，包括带括号的、类似函数的宏。您在 C 和 Objective-C 中使用复杂的宏来避免类型检查约束或避免重新输入大量样板代码。但是，宏会使调试和重构变得困难。在 Swift 中，您可以使用函数和泛型来实现相同的结果，而不会做出任何妥协。因此，您的 Swift 代码无法使用 C 和 Objective-C 源文件中的复杂宏。
So we use extension for this
所以我们为此使用扩展名
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
你可以像这样使用它
myLabel.textColor = UIColor(160.0, 97.0, 5.0, 1.0)
回答by jweyrich
You already got the right answer, but if you dislike the UIColorinterface like me, you can do this:
你已经得到了正确的答案，但如果你UIColor像我一样不喜欢这个界面，你可以这样做：
#import "UIColor+Helper.h"
// ...
myLabel.textColor = [UIColor colorWithRGBA:0xA06105FF];
UIColor+Helper.h:
UIColor+Helper.h：
#import <UIKit/UIKit.h>
@interface UIColor (Helper)
+ (UIColor *)colorWithRGBA:(NSUInteger)color;
@end
UIColor+Helper.m:
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
回答by Allamaprabhu
Yeah.ios supports RGB valur to range between 0 and 1 only..its close Range [0,1]
是的。ios 只支持 RGB 值的范围在 0 和 1 之间..它的接近范围 [0,1]
回答by hfossli
Color picker plugin for Interface Builder
Interface Builder的颜色选择器插件
There's a nice color picker from Panic which works well with IB: http://panic.com/~wade/picker/
Panic 有一个很好的颜色选择器，可以很好地与 IB 配合使用：http: //panic.com/~wade/picker/
Xcode plugin
Xcode插件
This one gives you a GUI for choosing colors: http://www.youtube.com/watch?v=eblRfDQM0Go
这个为您提供了一个用于选择颜色的 GUI：http: //www.youtube.com/watch?v=eblRfDQM0Go
Objective-C
目标-C
UIColor *color = [UIColor colorWithRed:(160/255.0) green:(97/255.0) blue:(5/255.0) alpha:1.0];
Swift
迅速
let color = UIColor(red: 160/255, green: 97/255, blue: 5/255, alpha: 1.0)
Pods and libraries
Pod 和库
There's a nice pod named MPColorTools: https://github.com/marzapower/MPColorTools
有一个不错的 pod 名为MPColorTools：https: //github.com/marzapower/MPColorTools
回答by hfossli
The values are determined by the bit of the image. 8 bit 0 to 255
这些值由图像的位决定。8 位 0 到 255
16 bit...some ridiculous number..0 to 65,000 approx.
16 位...一些荒谬的数字...大约 0 到 65,000。
32 bit are 0 to 1
32 位是 0 到 1
I use .004 with 32 bit images...this gives 1.02 as a result when multiplied by 255
我将 .004 与 32 位图像一起使用...乘以 255 时结果为 1.02
