向 iOS 应用程序添加颜色选择器
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Add a color picker to an iOS app
提问by ericsoco
I'm trying to add a color picker to my iOS application, using Xcode 5. It appears that Xcode offers a color well via the Palettes Panel of Interface Builder, but I can't find the Palettes Panel (nor can I find any documentation of it online beyond that link).
我正在尝试使用 Xcode 5 向我的 iOS 应用程序添加一个颜色选择器。 Xcode似乎通过 Interface Builder 的 Palettes Panel 提供了一种颜色，但我找不到 Palettes Panel（我也找不到任何文档它在该链接之外在线）。
That link also suggests an NSColorWellcan be added programatically. I'd prefer to go the Interface Builder route, but if that's not an option sample code would be welcome.
该链接还建议NSColorWell可以以编程方式添加。我更喜欢走 Interface Builder 路线，但如果这不是一个选项示例代码将受到欢迎。
回答by Suragch
I had the same question as you. It's unfortunate that there is no built in color picker for iOS. The other answers here and for similar questions mainly use third party libraries or projects. I prefer to avoid all the third party stuff whenever possible, so that leaves us with...
我和你有同样的问题。不幸的是，iOS 没有内置的颜色选择器。这里的其他答案和类似问题主要使用第三方库或项目。我宁愿尽可能避免所有第三方的东西，这样我们就......
Make your own color picker
制作自己的颜色选择器
There are many ways you could do it, but here is a simple example to show the concept. I set up my story board like this:
有很多方法可以做到这一点，但这里有一个简单的例子来展示这个概念。我这样设置我的故事板：
It has a UIView(grey here) to show the chosen color, a UIImageViewto show the color choices, and a UISliderto choose the color. I used the following image in the UIImageView:
它有一个UIView（此处为灰色）显示所选颜色，aUIImageView显示颜色选择，以及 aUISlider选择颜色。我在以下图片中使用了UIImageView：
I made it from the colors of a 12-spoke color wheelusing a screen shot and Gimp's color picker tool. Gimp is also useful for getting the color hex codes we will use later.
我使用屏幕截图和 Gimp 的颜色选择器工具从12 辐色轮的颜色制作它。Gimp 对于获取我们稍后将使用的颜色十六进制代码也很有用。
Set the min and max values for the Slider to 0.5 and 13.5. Converting the slider values to integers later will give one number for each of the colors in our image. Starting at 0.5 rather than 0 makes the slider color change location match the image better.
将滑块的最小值和最大值设置为 0.5 和 13.5。稍后将滑块值转换为整数将为我们图像中的每种颜色提供一个数字。从 0.5 而不是 0 开始会使滑块颜色更改位置更好地匹配图像。
Hook up the UI elements to the View Controller and use the following code to convert the slider position to colors.
将 UI 元素连接到 View Controller 并使用以下代码将滑块位置转换为颜色。
class ViewController: UIViewController {
// RRGGBB hex colors in the same order as the image
let colorArray = [ 0x000000, 0xfe0000, 0xff7900, 0xffb900, 0xffde00, 0xfcff00, 0xd2ff00, 0x05c000, 0x00c0a7, 0x0600ff, 0x6700bf, 0x9500c0, 0xbf0199, 0xffffff ]
@IBOutlet weak var selectedColorView: UIView!
@IBOutlet weak var slider: UISlider!
@IBAction func sliderChanged(sender: AnyObject) {
selectedColorView.backgroundColor = uiColorFromHex(colorArray[Int(slider.value)])
}
func uiColorFromHex(rgbValue: Int) -> UIColor {
let red = CGFloat((rgbValue & 0xFF0000) >> 16) / 0xFF
let green = CGFloat((rgbValue & 0x00FF00) >> 8) / 0xFF
let blue = CGFloat(rgbValue & 0x0000FF) / 0xFF
let alpha = CGFloat(1.0)
return UIColor(red: red, green: green, blue: blue, alpha: alpha)
}
}
Now if you run it, you can choose the color by moving the slider back and forth.
现在，如果您运行它，您可以通过来回移动滑块来选择颜色。
Variations
变化
- Position the slider on top of the image and set the track tints to transparent. This gives it the feel of a custom UI without having to subclass anything.
- 将滑块放在图像顶部并将轨道色调设置为透明。这给了它自定义 UI 的感觉，而无需子类化任何东西。
- Here is another image with lighter and darker variations of the example project image.
- 这是另一个具有示例项目图像更亮和更暗变化的图像。
let colorArray = [ 0x000000, 0x262626, 0x4d4d4d, 0x666666, 0x808080, 0x990000, 0xcc0000, 0xfe0000, 0xff5757, 0xffabab, 0xffabab, 0xffa757, 0xff7900, 0xcc6100, 0x994900, 0x996f00, 0xcc9400, 0xffb900, 0xffd157, 0xffe8ab, 0xfff4ab, 0xffe957, 0xffde00, 0xccb200, 0x998500, 0x979900, 0xcacc00, 0xfcff00, 0xfdff57, 0xfeffab, 0xf0ffab, 0xe1ff57, 0xd2ff00, 0xa8cc00, 0x7e9900, 0x038001, 0x04a101, 0x05c001, 0x44bf41, 0x81bf80, 0x81c0b8, 0x41c0af, 0x00c0a7, 0x00a18c, 0x00806f, 0x040099, 0x0500cc, 0x0600ff, 0x5b57ff, 0xadabff, 0xd8abff, 0xb157ff, 0x6700bf, 0x5700a1, 0x450080, 0x630080, 0x7d00a1, 0x9500c0, 0xa341bf, 0xb180bf, 0xbf80b2, 0xbf41a6, 0xbf0199, 0xa10181, 0x800166, 0x999999, 0xb3b3b3, 0xcccccc, 0xe6e6e6, 0xffffff]
Use an array of UIColors to avoid having to do the hex conversion.
Could use multiple UIViews rather than an image, and then set the colors directly from the array.
使用一组 UIColors 以避免必须进行十六进制转换。
可以使用多个 UIViews 而不是图像，然后直接从数组中设置颜色。
Further study
进一步研究
回答by jjxtra
I thought I would throw my color picker into the ring. I use it in my app, You Doodleand I spent a couple weeks making it and testing it in the app. It contains a sample project to show you how to get started with it and is open sourced under the MIT license. It supports any device (iOS 6+), any resolution and portrait and landscape. Favorites, recents, color by hue, color wheel and importing textures, as well as deleting and moving favorites to the front is supported.
我想我会把我的颜色选择器扔进戒指。我在我的应用程序You Doodle 中使用它，我花了几个星期制作它并在应用程序中测试它。它包含一个示例项目，向您展示如何开始使用它，并且在 MIT 许可下开源。它支持任何设备（iOS 6+）、任何分辨率以及纵向和横向。支持收藏夹、最近收藏、按色调着色、色轮和导入纹理，以及删除收藏夹并将其移到前面。
I've tried to combine the good pieces of all the other color pickers and ensure that the MIT license allows a no hassle integration into any project.
我试图结合所有其他颜色选择器的优点，并确保 MIT 许可证允许轻松集成到任何项目中。
Github:https://github.com/jjxtra/DRColorPicker
Github：https : //github.com/jjxtra/DRColorPicker
Screenshots:
截图：
