Xcode UIView.init(frame:) must be used from main thread only

Question

Xcode 9 has a new runtime Main Thread Checker that detects call to UIKit from a background thread and generate warnings.

I know its meant to generate warnings and not crash the app, but you can try disabling Main Thread Checker for your test target.

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I tried this code in a sample project, the debugger paused at the issue (as it is supposed to), but the app didn’t crash.

override func viewDidLoad() {
    super.viewDidLoad()

    DispatchQueue.global().async {
        let v = UIView(frame: .zero)
    }
}