iOS9向けバイナリの実行時に「This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release と表示された場合の対処

iOS9向けバイナリの実行時に、下記のメッセージがコンソールログに出力された場合の対処法。 This application is modifying the autolayout engine from a background thread, which can lead to engine corruption and weird crashes. This will cause an exception in a future release dispatch_async(dispatch_get_main_queue(), ^{ // 処理 }); 参考記事： http://stackoverflow.com/questions/28302019/getting-a-this-application-is-modifying-the-autolayout-engine-error