使用 swift 语言更改按钮背景颜色

Question

I am new to the swift language. Can someone tell me how to change the background color of a button using the swift language?

Answer 1

button.backgroundColor = UIColor.blue

Or any other color: red , green , yellow ,etc.

Another option is RGBA color:

button.backgroundColor = UIColor(red: 0.4, green: 1.0, blue: 0.2, alpha: 0.5)

Answer 2

试试这个，你需要像这样添加255 ：

button.backgroundColor = UIColor(red: 102/255, green: 250/255, blue: 51/255, alpha: 0.5)

Answer 3

Update for xcode 8 and swift 3, specify common colors like:

button.backgroundColor = UIColor.blue

the Color() has been removed.

Answer 4

If you want to set backgroundColor of button programmatically then this code will surly help you

Swift 3 and Swift 4

self.yourButton.backgroundColor = UIColor.red

Swift 2.3 or lower

self.yourButton.backgroundColor = UIColor.redColor()

Using RGB

self.yourButton.backgroundColor = UIColor(red: 102/255, green: 250/255, blue: 51/255, alpha: 0.5)

or you can use float values

button.backgroundColor = UIColor(red: 0.4, green: 1.0, blue: 0.2, alpha: 0.5)

Answer 5

You can set the background color of a button using the getRed function.
Let's assume you have:

1. A UIButton called button, and
2. You want to change button's background color to some known RBG value

Then, place the following code in the function where you want to change the background color of your UIButton

var r:CGFloat = 0
var g:CGFloat = 0
var b:CGFloat = 0
var a:CGFloat = 0

// This will be some red-ish color
let color = UIColor(red: 200.0/255.0, green: 16.0/255.0, blue: 46.0/255.0, alpha: 1.0) 

if color.getRed(&r, green: &g, blue: &b, alpha: &a){
    button.backgroundColor = UIColor(red: r, green: g, blue: b, alpha: a)
}

Answer 6

Swift 4,5 Add background color using number of ways.

1.Set button Color with below code

button.backgroundColor = UIColor.blue 
**OR**
button.backgroundColor = .blue

2.Using RGB color: red, green, yellow ,etc.

button.backgroundColor = UIColor(red: 0.1, green: 0.9, blue: 1.0, alpha: 1.0)

3.Using 255 like below

button.backgroundColor = UIColor(red: 203/255, green: 95/255, blue: 173/255, alpha: 1.0)

4.Using UIColor Extension like below

extension UIColor {
    convenience init(hex: String) {
        let scanner = Scanner(string: hex)
        scanner.scanLocation = 0
        
        var rgbColorValue: UInt64 = 0
        
        scanner.scanHexInt64(&rgbColorValue)
        
        let r = (rgbColorValue & 0xff0000) >> 16
        let g = (rgbColorValue & 0xff00) >> 8
        let b = rgbColorValue & 0xff
        
        self.init(
            red: CGFloat(r) / 0xff,
            green: CGFloat(g) / 0xff,
            blue: CGFloat(b) / 0xff, alpha: 1
        )
    }
}

How to use

button.backgroundColor = UIColor(hex:"FFFFFF")

Answer 7

U 还可以围绕 tintcolor 和 button image 来间接改变颜色。

Answer 8

/*Swift-5 update*/

let tempBtn: UIButton = UIButton(frame: CGRect(x: 5, y: 20, width: 40, height: 40))       
tempBtn.backgroundColor = UIColor.red

Answer 9

To change your background color of the botton use:

yourBtn.backgroundColor = UIColor.black

if you are using storyBoard make sure you have connected your storyBoard with your viewController and also that your items are linked.

if you don´t know how to do this check the next link:

How to connect ViewController.swift to ViewController in Storyboard?

Answer 10

Swift 3

Color With RGB

btnLogin.backgroundColor = UIColor.init(colorLiteralRed: (100/255), green: (150/255), blue: (200/255), alpha: 1)

Using Native color

btnLogin.backgroundColor = UIColor.darkGray

Answer 11

Swift 4:

You can easily use hex code:

self.backgroundColor = UIColor(hexString: "#ff259F6C")

self.layer.shadowColor = UIColor(hexString: "#08259F6C").cgColor

Extension for hex color code

extension UIColor {
    convenience init(hexString: String, alpha: CGFloat = 1.0) {
        let hexString: String = hexString.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
        let scanner = Scanner(string: hexString)
        if (hexString.hasPrefix("#")) {
            scanner.scanLocation = 1
        }
        var color: UInt32 = 0
        scanner.scanHexInt32(&color)
        let mask = 0x000000FF
        let r = Int(color >> 16) & mask
        let g = Int(color >> 8) & mask
        let b = Int(color) & mask
        let red   = CGFloat(r) / 255.0
        let green = CGFloat(g) / 255.0
        let blue  = CGFloat(b) / 255.0
        self.init(red:red, green:green, blue:blue, alpha:alpha)
    }
    func toHexString() -> String {
        var r:CGFloat = 0
        var g:CGFloat = 0
        var b:CGFloat = 0
        var a:CGFloat = 0
        getRed(&r, green: &g, blue: &b, alpha: &a)
        let rgb:Int = (Int)(r*255)<<16 | (Int)(g*255)<<8 | (Int)(b*255)<<0
        return String(format:"#%06x", rgb)
    }
}

Answer 12

将要更改其背景的 UIButton 作为 OUTlet 连接到 ViewController.swift 文件后，您可以使用以下内容：

 yourUIButton.backgroundColor = UIColor.blue