按钮上的 IBAction 函数未触发

Question

我在 VC 中有 3 个按钮，都连接到 IBAction 函数。其中两个工作正常，但提交按钮根本不会触发。

我已确保已启用用户交互。我也尝试添加 sender: AnyObject 作为参数并将函数重新连接到按钮，但仍然没有运气。我也清理了项目。我对发生的事情感到非常困惑。

VC 的外观如下：

连接按钮：

按钮的可访问性：

这是每个 IBAction 函数的代码：

@IBAction func captureImage(){
    self.saveVideoVar = false
    let imageFromSource = UIImagePickerController()
    imageFromSource.delegate = self
    imageFromSource.allowsEditing = false 

    //if there is a camera
    if UIImagePickerController.isSourceTypeAvailable(UIImagePickerControllerSourceType.Camera){
        imageFromSource.sourceType = UIImagePickerControllerSourceType.Camera
        self.presentViewController(imageFromSource, animated: true){}
    }
    else{
        let title = "Error"
        let message = "Could not load camera"

        let alert = UIAlertController(title: title, message: message, preferredStyle: .Alert)
        alert.addAction(UIAlertAction(title: "OK", style: UIAlertActionStyle.Cancel, handler: nil))
        presentViewController(alert, animated: true, completion: nil)
    }

}

@IBAction func openImageLibrary(){
    self.saveVideoVar = false
    let imageFromSource = UIImagePickerController()
    imageFromSource.delegate = self
    imageFromSource.allowsEditing = false

    imageFromSource.sourceType = UIImagePickerControllerSourceType.PhotoLibrary

    //presents (loads) the library
    self.presentViewController(imageFromSource, animated: true){}
}

//code to submit image and video to amazon S3
@IBAction func submitToS3(){

    print("x")


    if let img : UIImage = imageView.image! as UIImage{
        let path = (NSTemporaryDirectory() as NSString).stringByAppendingPathComponent("image.png")
        let imageData: NSData = UIImagePNGRepresentation(img)!
        imageData.writeToFile(path as String, atomically: true)

        // once the image is saved we can use the path to create a local fileurl
        let url:NSURL = NSURL(fileURLWithPath: path as String)
        nwyt.uploadS3(url)

    }

}

点击提交按钮的控制截图：

天啊！我觉得我好笨。有一个重复的屏幕我忘记删除了，它看起来完全一样，但不是正在显示的那个。我要在一个小时内删除它。以下是问题：

Answer 1

通过为按钮设置背景颜色进行检查，以便您了解按钮上方是否有任何视图。

Answer 2

试试这个：

//code to submit image and video to amazon S3
@IBAction func submitToS3(sender:UIButton){

print("x")

if let img : UIImage = imageView.image! as UIImage{
    let path = (NSTemporaryDirectory() as NSString).stringByAppendingPathComponent("image.png")
    let imageData: NSData = UIImagePNGRepresentation(img)!
    imageData.writeToFile(path as String, atomically: true)

    // once the image is saved we can use the path to create a local fileurl
    let url:NSURL = NSURL(fileURLWithPath: path as String)
    nwyt.uploadS3(url)
}

}

似乎缺少回调参数。应该管用。手指交叉！！

请在属性检查器中检查已启用的属性！

检查按钮名称！

创建一个新按钮和新方法。尝试并钩住。我曾经遇到过这样的问题。如果您使用的是 xCode 7，则可能是 xCode 问题。

Answer 3

我可以看到“submitToS3:”中有一个额外的“:”，意思是函数 submitToS3 应该有一个参数，这不是你的情况。

为了解决这个问题，只需删除 submitToS3 链接，然后从提交按钮拖放到控制器上方的黄色图标，并将其链接到“submitToS3”（你应该在那里看到它）。回看 Received Actions 视图时，您应该看不到“：”