Question

我有一个更长的代码，每隔一段时间就会将UIButton产生到UIViewController上。但是现在我要做的是将backgroundColor从随机颜色转换为UIColor.whiteColor（）。我可以创建一个函数来执行这个单击的UIButton，但是对于我生成的每一个UIButton都可以工作。或者更容易使用与UIButtons相反的UIViews并采用不同的路径？谢谢。

import UIKit
func randomPoint() -> CGPoint {
    let randomPoint: CGPoint = CGPoint(x:CGFloat(arc4random()%320),y: CGFloat(arc4random()%528))
    return randomPoint
}
class ViewController: UIViewController {

    @IBOutlet weak var startGameButton: UIButton!
    override func viewDidLoad() {
        super.viewDidLoad()

    }

    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }

}

class ViewTwo : UIViewController {

    var timer = NSTimer()

    func randomColor() -> UIColor {
        let red = CGFloat(drand48())
        let green = CGFloat(drand48())
        let blue = CGFloat(drand48())
        return UIColor(red: red, green: green, blue: blue, alpha: 1.0)
    }

    func spawnEnemy() {
        let enemy: UIButton = UIButton(frame: CGRect(x: 320, y: 320, width: 25, height: 25))
        enemy.backgroundColor = randomColor()
        enemy.center = randomPoint()
        enemy.addTarget(self, action: Selector("buttonPressed"), forControlEvents: UIControlEvents.TouchUpInside)
        self.view.addSubview(enemy)
    }

    // or my buttonPressed func goes but either way the app crashes when i click on one of the UIButtons

    override func viewDidLoad() {
        super.viewDidLoad()

        func buttonPressed(sender: UIButton) {
            sender.backgroundColor = UIColor.whiteColor()
        }

        timer = NSTimer.scheduledTimerWithTimeInterval(0.1, target: self, selector: Selector("spawnEnemy"), userInfo: nil, repeats: true)

    }
    override func didReceiveMemoryWarning() {
        super.didReceiveMemoryWarning()

    }
}

Answer 1

当您创建按钮以生成它们时，您可以添加如下目标：

button.addTarget(self, action: "buttonClicked:", forControlEvents: UIControlEvents.TouchUpInside)

然后添加相应的功能将背景颜色更改为白色，如下所示：

func buttonClicked(sender: UIButton) {
    sender.backgroundColor = UIColor.whiteColor()
}

这适用于您生成的所有按钮。

如何在swift中创建一个函数来处理将在ViewController上的所有UIButton

1 个答案: