objective c - NSThread detachNewThreadSelector: Crash only in release build in Xcode 7 + Swift 2.0 -


i have framework calls methods in appdelegate using detachnewthreadselector: of nsthread, looks this:

private func bridgeselector(selector: string?, object: string?) {         if selector != nil && responder != nil {             dispatch_async(dispatch_get_main_queue(), {                 nsthread.detachnewthreadselector(selector(                     selector!),                     totarget: self.responder!,                     withobject: object                 )             })         }     }

the responder var assigned self in appdelegate when framework's class initialized.

the application ran without problem in debug build, crashed @ once when above called if it's in release build. (it crashed when turned off optimize in release build.)

i'm using xcode 7 beta , swift 2.0. (i knew it's beta, it's beta supports swift 2.)

edit - end use closure instead of detachnewthreadselector:. works in both builds.

try adding respondstoselector: check there. dirty, that. dirty believe

func bridgeselector(selector: string?, object: string?) {     if let r = responder, let sel = selector         r.respondstoselector(selector(sel))     {         dispatch_async(dispatch_get_main_queue(), {             nsthread.detachnewthreadselector(                 selector(sel),                 totarget: r,                 withobject: object             )         })     } }

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