Parse and Swift 1.2 issue

debugcn Published at Dev

hudsonian

This code worked fine in Swift 1.1 ... just trying to figure out what's changed in 1.2 to make it incompatible:

@IBAction func load_click(sender: AnyObject) {

    var query = PFQuery(className: "myClass")
    query.getObjectInBackgroundWithId("MPSVivtvJR", block: { (object:PFObject!, error: NSError) -> Void in

        let theName = object["name"] as String
        let theAge = object["age"] as Int?

        println(theName)
        println(theAge)

    })
}

It gives me the error: Cannot invoke 'GetObjectInBackgroundWithId' with an argument list of type '(String, block: (PFObject!, NSError) -> Void)

Any ideas? Thanks!

iagomr

Now with Swift 1.2 you are supposed to be more careful with unwrapping optionals. So inside the closure where you have PFObject and NSError, either remove the exclamation marks or add a question mark to make it optional.

Then, unwrap your object more safely. Try as follows:

// You can create this in a separate file where you save your models

struct myUser {
    let name: String?
    let age: Int?
}

// Now this in the view controller

@IBAction func load_click(sender: AnyObject) {
    var query = PFQuery(className: "myClass")
    query.getObjectInBackgroundWithId("MPSVivtvJR", block: {
        (object:PFObject!, error: NSError?) -> Void in

        if let thisName = object["name"] as? String{
            if let thisAge = object["age"] as? Int{
                let user = myUser(name: thisName, age: thisAge)
                println(user)
            }
        }

    })
}

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