Back to the main thread: DispatchQueue.main - a free Hacking with Swift tutorial
Xcode UIView.init(frame:) must be used from main thread only - Stack Overflow
![iOS 11] Xcode 9で“だいぶまとも”に！新機能をまとめてみた | DevelopersIO](https://cdn-ssl-devio-img.classmethod.jp/wp-content/uploads/2017/09/xcode_9_ubs_1.png "iOS 11] Xcode 9で“だいぶまとも”に！新機能をまとめてみた | DevelopersIO")
iOS 11] Xcode 9で“だいぶまとも”に！新機能をまとめてみた | DevelopersIO
Finish reading Runloop
UIApplication delegate] must be used from main thread only · Issue #52 · jiulongw/swift-unity · GitHub
iOS] Race condition between the main thread and a thread used by CADisplayLinkTicker · Issue #1755 · xamarin/Xamarin.Forms · GitHub
![IOS bottom layer] main thread & main runloop - 编程知识](https://inotgo.com/imagesLocal/202102/13/20210213171728768q_2.png "IOS bottom layer] main thread & main runloop - 编程知识")
IOS bottom layer] main thread & main runloop - 编程知识
Bowling gemäß Ale uiswitch.on must be used from main thread only Onkel oder Herr Zeitung Tablett
Creating Mobile Apps with Xamarin.Forms Preview Edition 2 | Manualzz
Xcode/Swift】紫の警告の対応方法：UIApplication.registerForRemoteNotifications() must be used from main thread only
![iOS] UI API called from background thread Group · Issue #4505 · mattermost/mattermost-mobile · GitHub](https://avatars.githubusercontent.com/u/211855?s=88&v=4 "iOS] UI API called from background thread Group · Issue #4505 · mattermost/mattermost-mobile · GitHub")
iOS] UI API called from background thread Group · Issue #4505 · mattermost/mattermost-mobile · GitHub
iOS must be used from main thread only · Issue #4447 · bilibili/ijkplayer · GitHub
Toggle UISwitch on/off in swift - Stack Overflow
UIImageView.image must be used from main thread only · Issue #827 · onevcat/Kingfisher · GitHub
![Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow](https://i.stack.imgur.com/lazOo.png "Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow")
Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow
画面遷移時にMain Thread Checkerのエラーが出た時の対処法(Swift) - Qiita
The real importance
iOS UISwitch - JournalDev
iOS UISwitch - JournalDev
UIApplication delegate must be used from main thread only - Swift - Stack Overflow
Bowling gemäß Ale uiswitch.on must be used from main thread only Onkel oder Herr Zeitung Tablett
UIView.layer must be used from main thread only · Issue #226 · BradLarson/GPUImage2 · GitHub
