Keep showing error on Swift 2.2, but can build successfully.

Question

kennyliao OP

Created Mar ’16

Replies 2

Boosts 0

Participants 3

Hi,

After upgraded to Xcode 7.3, Swift 2.2.

In the code,

func handleInfo(info: [NSObject: AnyObject]) {
     let aps = info["aps"]
     if let message = aps!["alert"] as? String {
          .....
     }
}

it will keep showing error for this line: if let message = aps!["alert"] as? String

( Downcast from 'String?!' to 'Sting' only unwraps optionals; did you meant to use '!!'?)

But if I build and run, it will run successfully without any issue.

However, it pretty annoying that it keep showing up when I coding.

Anyway to fix that?

Boost

Answer 1

stagrp OP

Mar ’16

Hi Kenny,

Oddly enough, I did not get that warning with the latest Xcode release 7.3 (7D175)

For the fun of it I further defined the types as indicated below, but did not have any issues with your code above.

    func testHandleInfo() {
        var info: [NSObject: AnyObject] = [NSObject: AnyObject]()
        var aps: [NSObject: AnyObject] = [NSObject: AnyObject]()
        aps["alert"] = "Alert"
        info["aps"] = aps
       
        self.handleInfo(info)
    }
   
    func handleInfo(info: [NSObject: AnyObject]) {
        let aps: [NSObject: AnyObject]? = info["aps"] as? [NSObject: AnyObject]
        if let message = aps!["alert"] as? String {
            NSLog("message: \(message)")
        }
    }

0

Answer 2

OOPer OP

Mar ’16

It seems Xcode 7.3 tend to keep (or re-activate) old (sometimes, very very old) warnings and errors which are not caused by the current codes.

Try clean build (Product > Clean or Option-Product > Clean Build Folder...) or you may need to wait until someone find which folder to be emptied.

0