更改ViewController Swift的背景颜色？(单视图应用程序)

Question

我在Swift(XCode 6.2)中创建了一个非常简单的单视图应用程序,它包含2个按钮"blackButton"和"whiteButton".单击blackButton后,它会将View的背景颜色更改为Black,并在单击whiteButton时将背景更改为白色.有谁能建议任何可能的方法来做到这一点？

ViewController.swift:

//beginning
import UIKit

class ViewController: UIViewController {

    @IBAction func blackButton(sender: AnyObject) {
    }
    @IBAction func whiteButton(sender: AnyObject) {
    }
    override func viewDidLoad() {
        super.viewDidLoad()
        // Do any additional setup after loading the view, typically from a nib.
    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()
        // Dispose of any resources that can be recreated.
    }


}

Answer 1

视图控制器的视图可以通过它的view属性访问,这只是一个常规属性UIView. UIView有一个backgroundColor属性,它是一个UIColor控制视图颜色的属性.

@IBAction func blackButton(sender: AnyObject) {
   view.backgroundColor = .black
}

@IBAction func whiteButton(sender: AnyObject) {
   view.backgroundColor = .white
}

Answer 2

对于自定义颜色

@IBAction func blackButton(sender: AnyObject) {
    let blackColor = UIColor(red: 255/255.0, green: 255/255.0, blue: 255/255.0, alpha: 1.0)
    view.backgroundColor = blackColor 
 }

@IBAction func whiteButton(sender: AnyObject) {
    let whiteColor = UIColor(red: 0/255.0, green: 0/255.0, blue: 0/255.0, alpha: 1.0)
    view.backgroundColor = whiteColor
}