Swift build failed. No errors.

This happened to me while I was writing in Swift 4.1 in XCode 9.3. I use RxSwift also. It never happened while I was writing in Objective C. There were no any logs in Report Navigator too. Project just compiled without errors, then failed. Couldn’t figure out why.

In my case what I did and it helped:

1. Commit changes in Git and then discard changes in XCode if it shows “M” near files
2. Clear derived data: Xcode -> Preferences -> location
3. Clean build folder: Shift + Cmd + Alt + K
4. Restart XCode

After this project tried to compile and showed errors. The error was here:

    do {
        let jsonData = try JSONSerialization.data(withJSONObject: timingsDict, options: .prettyPrinted)
        let decoder = JSONDecoder()
        let pTiming = try decoder.decode(PTiming.self, from: jsonData)
        observer.onNext(timing)
        observer.onCompleted()
    } catch {
        print(error.localizedDescription)
        observer.onError(error)
    }

do {

let jsonData = try JSONSerialization.data(withJSONObject: timingsDict, options: .prettyPrinted)

let decoder = JSONDecoder()

let pTiming = try decoder.decode(PTiming.self, from: jsonData)

observer.onNext(timing)

observer.onCompleted()

} catch {

print(error.localizedDescription)

observer.onError(error)

}

I passed wrong variable name in observer.onNext(timing). It should have been pTiming.

Alwawee

Swift build failed. No errors.

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