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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
![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
Xcode UIView.init(frame:) must be used from main thread only - Stack Overflow
React Native Error: must be used from main thread only - cpming
![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
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UIButton setEnabled:] must be used from main thread only · Issue #1 · ayakix/Image-Picker · GitHub
![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
Learn how to make API call in iOS and parse JSON array Warmodroid
Main Thread Checker in XCode. XCode is a very powerful Application… | by Niki Trivedi | Medium
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SOLVED: Day 39: Course code throws warning "-[UINavigationController tabBarItem] must be used from main thread only" – 100 Days of Swift – Hacking with Swift forums
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Mustii (@_silly__) / Twitter
How React Native constructs app layouts (and how Fabric is about to change it)
