ios 除了预设的 UIColor 之外，如何制作自己的自定义 UIColor？
声明：本页面是StackOverFlow热门问题的中英对照翻译，遵循CC BY-SA 4.0协议，如果您需要使用它，必须同样遵循CC BY-SA许可，注明原文地址和作者信息，同时你必须将它归于原作者（不是我）：StackOverFlow
原文地址: http://stackoverflow.com/questions/1956587/
Warning: these are provided under cc-by-sa 4.0 license. You are free to use/share it, But you must attribute it to the original authors (not me):
StackOverFlow
How do I make my own custom UIColor's other than the preset ones?
提问by Jab
I want to make my own RGB colors that are UIColorsand that I could use just like UIColor blackColoror any other.
我想制作我自己的 RGB 颜色UIColors，我可以使用它UIColor blackColor或任何其他颜色。
回答by EEE
You can write your own method for UIColor class using categories.
您可以使用类别为 UIColor 类编写自己的方法。
#import <UIKit/UIKit.h>
@interface UIColor(NewColor)
+(UIColor *)MyColor;
@end
#import "UIColor-NewColor.h"
@implementation UIColor(NewColor)
+(UIColor *)MyColor {
return [UIColor colorWithRed:0.0-1.0 green:0.0-1.0 blue:0.0-1.0 alpha:1.0f];
}
By this way, you create a new color and now you can call it like
通过这种方式，您创建了一种新颜色，现在您可以将其命名为
[UIColor MyColor];
You can also implement this method to obtain random color. Hope this helps.
您也可以实现此方法来获取随机颜色。希望这可以帮助。
回答by James
I needed to define a couple of custom colors for use in several places in an app - but the colours are specific to that app. I thought about using categories, but didn't want to have extra files to include every time. I've therefore created a couple of static methods in my App delegate.
我需要定义几个自定义颜色以在应用程序的多个位置使用 - 但颜色特定于该应用程序。我考虑过使用类别，但不想每次都包含额外的文件。因此，我在我的 App 委托中创建了几个静态方法。
In MyAppDelegate.h
在 MyAppDelegate.h 中
+ (UIColor*)myColor1;
In MyAppDelegate.m
在 MyAppDelegate.m 中
+ (UIColor*)myColor1 {
return [UIColor colorWithRed:26.0f/255.0f green:131.0f/255.0f blue:32.0f/255.0f alpha:1.0f];
}
I have a method per color, or you could do a single method and add a parameter.
我对每种颜色都有一个方法，或者您可以执行一个方法并添加一个参数。
I can then use it anywhere in the app like this:
然后我可以在应用程序的任何地方使用它，如下所示：
myView.backgroundColor = [MyAppDelegate myColor1];
I hope this helps someone else.
我希望这对其他人有帮助。
回答by Suragch
Swift 3
斯威夫特 3
Creating a Swift extension allows you to define your own custom colors and use them just like the built in colors.
创建 Swift 扩展允许您定义自己的自定义颜色并像内置颜色一样使用它们。
UIColor+CustomColor.swift
UIColor+CustomColor.swift
import UIKit
extension UIColor {
class var customGreen: UIColor {
let darkGreen = 0x008110
return UIColor.rgb(fromHex: darkGreen)
}
class func rgb(fromHex: Int) -> UIColor {
let red = CGFloat((fromHex & 0xFF0000) >> 16) / 0xFF
let green = CGFloat((fromHex & 0x00FF00) >> 8) / 0xFF
let blue = CGFloat(fromHex & 0x0000FF) / 0xFF
let alpha = CGFloat(1.0)
return UIColor(red: red, green: green, blue: blue, alpha: alpha)
}
}
Usage:
用法：
view.backgroundColor = UIColor.customGreen
回答by M.Arsalan
[UIColor colorWithRed:51.0 / 255.0, green:0.0, blue:153.0 / 255.0];
As long as you use a floating point value in your division you don't have to cast anything. Make sure you use floating point values. For example: 33 / 255 = 0. Which will become black.
只要您在除法中使用浮点值，您就不必进行任何转换。确保使用浮点值。例如：33 / 255 = 0。哪个会变黑。
回答by iPhone Guy
There are a couple of ways to create a color.
有几种方法可以创建颜色。
I prefer to use the RGB method. If you use the RGB values, divide them by 255 (I do not remember why, but I know you need to do it).
我更喜欢使用RGB方法。如果您使用 RGB 值，请将它们除以 255（我不记得为什么，但我知道您需要这样做）。
float rd = 225.00/255.00;
float gr = 177.00/255.00;
float bl = 140.00/255.00;
[label setTextColor:[UIColor colorWithRed:rd green:gr blue:bl alpha:1.0]];
Hope this helps.....
希望这可以帮助.....
回答by ovatsug25
For Swift:
对于斯威夫特：
let swiftColor = UIColor(red: 1, green: 165/255, blue: 233, alpha: 1)
回答by gerry3
Use initWithRed:green:blue:alpha:or colorWithRed:green:blue:alpha:.
使用initWithRed:green:blue:alpha:或colorWithRed:green:blue:alpha:。
For example:
例如：
// create new autoreleased UIColor object named "myColor"
UIColor *myColor = [UIColor colorWithRed:0.5f green:0.5f blue:0.5f alpha:1.0f];
// create new retained UIColor object named "myColor2"
UIColor *myColor2 = [[UIColor alloc] initWithRed:0.5f green:0.5f blue:0.5f alpha:1.0f];
