Introduction to Multithreading and DispatchQueue
runtime: UI API called from background thread: XXX must be used from main thread only - 简书
![UIView setHidden:] must be used from main thread only · Issue #46 · gang544043963/LGPhotoBrowser · GitHub](https://user-images.githubusercontent.com/13481443/39958928-712f93ea-563c-11e8-9630-e5e7b07a4e81.png "UIView setHidden:] must be used from main thread only · Issue #46 · gang544043963/LGPhotoBrowser · GitHub")
UIView setHidden:] must be used from main thread only · Issue #46 · gang544043963/LGPhotoBrowser · GitHub
已解决】Xcode9提示：runtime UI API called from background thread UIApplication currentUserNotificationSettings must be used from main thread only – 在路上
Xcode Runtime Errors | Vuforia Developer Portal
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![UIView setHidden:] must be used from main thread only · Issue #46 · gang544043963/LGPhotoBrowser · GitHub](https://user-images.githubusercontent.com/13481443/39958918-6391ef76-563c-11e8-92e0-ec35bbea24e8.png "UIView setHidden:] must be used from main thread only · Issue #46 · gang544043963/LGPhotoBrowser · GitHub")
UIView setHidden:] must be used from main thread only · Issue #46 · gang544043963/LGPhotoBrowser · GitHub
Xcode UIView.init(frame:) must be used from main thread only - Stack Overflow
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Main Thread Checker - ITZone
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Can't call any method "can only be called from the main thread" error - Unity Forum
![runtime: UI API called from background thread: -[UIApplication applicationState] must be used from main thread only - Stack Overflow](https://i.stack.imgur.com/fB8FR.png "runtime: UI API called from background thread: -[UIApplication applicationState] must be used from main thread only - Stack Overflow")
runtime: UI API called from background thread: -[UIApplication applicationState] must be used from main thread only - Stack Overflow
Main Thread in C# - GeeksforGeeks
Main Thread Checker in XCode. XCode is a very powerful Application… | by Niki Trivedi | Medium
Understanding The iOS Main Thread | Grio Blog
已解决】Xcode9提示：runtime UI API called from background thread UIApplication currentUserNotificationSettings must be used from main thread only – 在路上
