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![swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow](https://i.stack.imgur.com/veO49.png "swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow")
swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow
iOS 11 + xcode 9: warnings on calling UI methods from a background thread · Issue #1988 · phonegap/phonegap-plugin-push · GitHub
iOS 11 + xcode 9: warnings on calling UI methods from a background thread · Issue #1988 · phonegap/phonegap-plugin-push · GitHub
ios - Computed Property - How to use only on main thread? - Stack Overflow
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![objective c - 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 "objective c - runtime: UI API called from background thread: -[UIApplication applicationState] must be used from main thread only - Stack Overflow")
objective c - runtime: UI API called from background thread: -[UIApplication applicationState] must be used from main thread only - Stack Overflow
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UITextField.textAlignment must be used from main thread only” Can't reset TextRows in iOS 11 xcode 9.1 · Issue #1351 · xmartlabs/Eureka · GitHub
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Introduction to Multithreading and DispatchQueue
![swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow](https://i.stack.imgur.com/lazOo.png "swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow")
swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow
![swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow](https://i.stack.imgur.com/teE1e.png "swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow")
swift - Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] - Stack Overflow
