{"action":"opened","number":1656,"pull_request":{"url":"https://api.github.com/repos/mozilla/firefox-ios/pulls/1656","id":63771646,"html_url":"https://github.com/mozilla/firefox-ios/pull/1656","diff_url":"https://github.com/mozilla/firefox-ios/pull/1656.diff","patch_url":"https://github.com/mozilla/firefox-ios/pull/1656.patch","issue_url":"https://api.github.com/repos/mozilla/firefox-ios/issues/1656","number":1656,"state":"open","locked":false,"title":"Bug 1258716/1258716 - Moved delegate for disabling Touch ID switch to view controller from setting","user":{"login":"sleroux","id":434322,"avatar_url":"https://avatars.githubusercontent.com/u/434322?v=3","gravatar_id":"","url":"https://api.github.com/users/sleroux","html_url":"https://github.com/sleroux","followers_url":"https://api.github.com/users/sleroux/followers","following_url":"https://api.github.com/users/sleroux/following{/other_user}","gists_url":"https://api.github.com/users/sleroux/gists{/gist_id}","starred_url":"https://api.github.com/users/sleroux/starred{/owner}{/repo}","subscriptions_url":"https://api.github.com/users/sleroux/subscriptions","organizations_url":"https://api.github.com/users/sleroux/orgs","repos_url":"https://api.github.com/users/sleroux/repos","events_url":"https://api.github.com/users/sleroux/events{/privacy}","received_events_url":"https://api.github.com/users/sleroux/received_events","type":"User","site_admin":false},"body":"Looks like both 1258716/1258716 were being caused by the same issue: The callbacks invoked after either successfully or failing to input Touch ID were never\nbeing called. The reason they were not being called is that the `TouchIDSetting` where we pass in the callback blocks from was being deallocated when the Touch\nID prompt was being shown. The reason the prompt was causing this whenever the Touch ID prompt is displayed/dismissed is because we bind `refreshSettings`\nto the `UIApplicationDidBecomeActiveNotification` notification which gets invoked when the system returns us back to the application after showing the prompt.\nCalling `refreshSettings` in turn regenerates the settings which causes the old TouchIDSettings object to evaporate. The previously-attached callback blocks disappear along with it\nsince they were created within that scope - hence, no callback.\n\nThe short term solution this patch contains is extracting the callback blocks into functions on the view controller and pass them in to allow the TouchIDSetting to be removed without\nworrying about the callbacks going away with it. The toggling of the cell is then inferred from the cell position.\n\nI'll be honest, this isn't the best patch in the world. Long term I'd like\nreconsider how we generate our settings and attach them to the view controller. I feel like actions like these should maybe be executed using a delegate which the view controller would\nimplement or forward to other strongly held objects to align the lifecycles of the VC with 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