你怎么用“让newSwiftColor = UIColor（红色：255，绿色：165，蓝色：0，alpha：0）？ [英] How do you use " let newSwiftColor = UIColor(red: 255, green: 165, blue: 0, alpha: 0)?

问题描述

我正在编写一个应用程序，其中按钮的边框颜色为＃22A7EF的十六进制颜色。在viewDidLoad部分中，我尝试设置边框的颜色，如下所示：

I am writing an app where a button has a border with the hex color of #22A7EF. In the viewDidLoad section, I tried to set the colors of the borders like this:

    override func viewDidLoad() {
    super.viewDidLoad()
    // Do any additional setup after loading the view, typically from  a nib.
    animalNumber.delegate = self
    weightInKilos.delegate = self
    percentOfDehydration.delegate = self
    ongoingLosses.delegate = self
    factor.delegate = self

    let newSwiftColor = UIColor(red: 34, green: 167, blue: 239, alpha: 0)

    calcbutton.layer.cornerRadius = 4;
    calcbutton.layer.borderWidth = 1;
    calcbutton.layer.borderColor = UIColor.newSwiftColor().CGColor
}

我认为这是声明颜色变量的正确方法，但是我应该如何在 calcbutton.layer.borderColor = UIColor.newSwiftColor（）中使用该变量.CGColor 部分？ Xcode表示对于我刚才显示的代码行，类型UIColor没有成员newSwiftColor。我想我正在错误地实现变量。有人知道或看到我做错了吗？谢谢！

I think that is the correct way to declare a color variable, but how am I supposed to use the variable in the calcbutton.layer.borderColor = UIColor.newSwiftColor().CGColor part? Xcode says for the line of code I just showed that "type UIColor has no member newSwiftColor". I think I am implementing the variable incorrectly. Does anybody know or see what I did wrong? Thanks!

PS - 在您发表评论或回答之前，请知道

PS- Before you comment or answer, please know that

• 我是一个12岁的孩子，他学到了我所知道的关于在线编程的一切。


• 我浏览了很多网上文章（包括Stack Overflow），但我做了不明白任何答案:(
  谢谢！

推荐答案

既然你'重新创建一个包含对UIColor（ newSwiftColor ）的引用的新变量，它只是：

Since you're creating a new variable that contains a reference to a UIColor (newSwiftColor), it would just be:

calcbutton.layer.borderColor = newSwiftColor.CGColor

请注意颜色在UIKit是使用0..1中的浮点数而不是0..255的整数来指定的，因此您需要将所有RGB值除以255.0：

Note that Colors in UIKit are specified using floats from 0..1 not ints from 0..255, so you need to divide all your RGB values by 255.0:

let newSwiftColor = UIColor(red: 34.0/255.0, green: 167.0/255.0, blue: 239.0/255.0, alpha: 0)

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