UIColor不使用RGBA值 [英] UIColor not working with RGBA values

问题描述

我正在尝试使用以下代码（RGBA值）更改UITextField中的文本颜色，但它只是显示为白色或清晰，我不太确定，因为背景本身就是白色。

I am trying to change the text colour in a UITextField using the following code (RGBA value) however it just appears white, or clear, I'm not too sure as the background is white itself.

passwordTextField.textColor = UIColor(red: CGFloat(202.0), green: CGFloat(228.0), blue: CGFloat(230.0), alpha: CGFloat(100.0))

passwordTextField.returnKeyType = UIReturnKeyType.Done
passwordTextField.placeholder = "Password"
passwordTextField.backgroundColor = UIColor.clearColor()
passwordTextField.borderStyle = UITextBorderStyle.RoundedRect
passwordTextField.font = UIFont(name: "Avenir Next", size: 14)
passwordTextField.textAlignment = NSTextAlignment.Center
passwordTextField.secureTextEntry = true

推荐答案

UIColor的RGB值介于0和1之间（参见< a href =https://developer.apple.com/library/ios/documentation/uikit/reference/UIColor_Class/Reference/Reference.html#//apple_ref/occ/clm/UIColor/colorWithRed%3agreen%3ablue%3aalpha% 3a>文档指定为0.0到1.0之间的值）

RGB values for UIColor are between 0 and 1 (see the documentation "specified as a value from 0.0 to 1.0")

您需要将数字除以255：

You need to divide your numbers by 255:

passwordTextField.textColor = UIColor(red: CGFloat(202.0/255.0), green: CGFloat(228.0/255.0), blue: CGFloat(230.0/255.0), alpha: CGFloat(1.0))

另外，你不需要创建CGFloats ：

Another thing, you don't need to create CGFloats:

passwordTextField.textColor = UIColor(red:202.0/255.0, green:228.0/255.0, blue:230.0/255.0, alpha:1.0)

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