Unresolvable error with Parse “Get Data In Background With Block”

问题

I don't know if this is user error or due to the Xcode and Swift updates. I'm pulling image files off of Parse and no matter how I tweak the syntax I get a persistent error of:

swift:64:23: Cannot invoke 'getDataInBackgroundWithBlock' with an argument list of type '((NSData!, NSError?) -> Void)

My code is:

func callData() {

    var imageQuery = PFObject(className: "QuestionMaster")
    let iconImageFile = imageQuery["questionImage"] as! PFFile!
    iconImageFile.getDataInBackgroundWithBlock {
        (imageData: NSData!, error: NSError?) -> Void in

        if (error == nil) {

            self.icon1 = UIImage(data: imageData[0])
            self.icon2 = UIImage(data: imageData[1])
            self.icon3 = UIImage(data: imageData[2])
            self.icon4 = UIImage(data: imageData[3])
            self.icon5 = UIImage(data: imageData[4])
            self.icon6 = UIImage(data: imageData[5])
            self.icon7 = UIImage(data: imageData[6])
            self.icon8 = UIImage(data: imageData[7])
            self.icon9 = UIImage(data: imageData[8])
        }
        else {
            NSLog("Something went wrong.")
        }

I've been working straight from the Parse docs. I have also tried:

iconImageFile.getDataInBackgroundWithBlock(imageQuery, block: {
            (imageData: NSData!, error: NSError?) -> Void in

And I've exchanged ! and ? to no avail. The same things happens elsewhere in my code with findObjectInBackgroundWithBlock.

回答1:

This is due the changes in swift 1.2. Parse should have already provided a version of their framework that fixes this. Download it from their website.

Edit

Also, don't forget to unwrap the imageData value with if let

The following code works for me on the lastest Parse framework version using swift 1.2

imageFile.getDataInBackgroundWithBlock { (imageData: NSData?, error: NSError?) -> Void in

    if let imageData = imageData where error == nil
    {
        self.image = UIImage(data: imageData)
    }
}

来源：https://stackoverflow.com/questions/29595084/unresolvable-error-with-parse-get-data-in-background-with-block