runtime: UI API called from background thread: XXX must be used from main thread only - 简书
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Main Thread Checker in XCode. XCode is a very powerful Application… | by Niki Trivedi | Medium
![Xcode] 主線程檢查器(Main Thread Checker) | 逍遙文工作室](https://cg2010studio.files.wordpress.com/2018/08/xcode-e4b8bbe7b79ae7a88be6aaa2e69fa5e599a8-main-thread-checker1.png "Xcode] 主線程檢查器(Main Thread Checker) | 逍遙文工作室")
Xcode] 主線程檢查器(Main Thread Checker) | 逍遙文工作室
Can't call any method "can only be called from the main thread" error - Unity Forum
![SOLVED: Day 39: Course code throws warning "-[UINavigationController tabBarItem] must be used from main thread only" – 100 Days of Swift – Hacking with Swift forums](https://avatars.githubusercontent.com/u/2793158 "SOLVED: Day 39: Course code throws warning \"-[UINavigationController tabBarItem] must be used from main thread only\" – 100 Days of Swift – Hacking with Swift forums")
SOLVED: Day 39: Course code throws warning "-[UINavigationController tabBarItem] must be used from main thread only" – 100 Days of Swift – Hacking with Swift forums
Swift Error "UIButton.currentTitle must be used from main thread only" - Stack Overflow
Minimize main thread work
Mustii (@_silly__) / Twitter
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UIButton setEnabled:] must be used from main thread only · Issue #1 · ayakix/Image-Picker · GitHub
Learn how to make API call in iOS and parse JSON array Warmodroid
Multi-threading & callbacks primer | Training Courses | Android Developers
![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
![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
iOS : Xcode UIView.init(frame:) must be used from main thread only - YouTube
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 UIView.init(frame:) must be used from main thread only - Stack Overflow
Introduction to Multithreading and DispatchQueue
UIApplication delegate must be used from main thread only - Swift - Stack Overflow
Thread notification: Main thread notifies both worker threads. | Download Scientific Diagram
