debugging - 麻烦调试 NSTimer

Question

我试图让图像显示 1 秒并在 1 秒后消失。当我构建我的应用程序时它工作正常但是当我运行我的应用程序时它崩溃了。这是我的代码:

var flashTimer = NSTimer()
var timerCounter = 0
var currentTime = 0
var randomImageGeneratorNumber = 0
var flashingImageView = UIImageView()
var flashButton = UIButton()

@IBAction func flashButton(sender: UIButton) {

    var randomImageGeneratorNumber = arc4random_uniform(6) + 1
    if flashButton.hidden {
        flashButton.hidden = true
        flashingImageView.hidden = false
    }
    if randomImageGeneratorNumber == 1 {
        flashingImageView.image = UIImage(named: "Image1.png")
    }
    if randomImageGeneratorNumber == 2 {
        flashingImageView.image = UIImage(named: "Image2.png")
    }
    if randomImageGeneratorNumber == 3 {
        flashingImageView.image = UIImage(named: "Image3.png")
    }
    if randomImageGeneratorNumber == 4 {
        flashingImageView.image = UIImage(named: "Image4.png")
    }
    if randomImageGeneratorNumber == 5 {
        flashingImageView.image = UIImage(named: "Image5.png")
    }
    if randomImageGeneratorNumber == 6 {
        flashingImageView.image = UIImage(named: "Image6.png")
    }
    var currentTime = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: "timerFunc", userInfo: nil, repeats: false)
    func timerFunc(sender: AnyObject){
        flashingImageView.hidden = true;
    }
}

调试器输出的错误是: [Flash_Facts.ViewController timerFunc]: 无法识别的选择器发送到实例 0x7f9ceb774810

我不确定如何解决这个问题。有什么建议吗？

提前致谢。

Answer 1

问题是您必须在 IBAction 函数之外创建您的函数。这同样适用于您的计时器 var ( currentTime )

var currentTime = NSTimer()
func timerFunc() {
     flashButton.hidden = !flashButton.hidden
     flashingImageView.hidden = !flashingImageView.hidden
}
@IBAction func flashButton(sender: UIButton) {
     flashButton.hidden = !flashButton.hidden
     flashingImageView.hidden = !flashingImageView.hidden
     flashingImageView.image = UIImage(named: "Image\(arc4random_uniform(6) + 1).png")
     currentTime = NSTimer.scheduledTimerWithTimeInterval(1.0, target: self, selector: "timerFunc", userInfo: nil, repeats: false)

}