Main Thread Checker: UI API called on a background thread

ZenonHuang commented 5 years ago

Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] PID: 14352, TID: 3167824, Thread name: (none), Queue name: com.apple.root.default-qos, QoS: 0 Backtrace:

 -[UTSelfStaticsManager getAppState] + 60
-[UTSelfStaticsManager onEventForCrash] + 256
-[UTMCSystemHook appDIdEnterBackground:]_block_invoke.51 + 196
_dispatch_call_block_and_release + 24
_dispatch_client_callout + 16
_dispatch_queue_override_invoke + 876
 _dispatch_root_queue_drain + 372
 _dispatch_worker_thread2 + 156
_pthread_wqthread + 464
 start_wqthread + 4

请问什么时候能修复这个问题？你们 hook 了进入后台方法，在里面做 UI 操作，现在我们 App 再次切回来,偶尔会引发卡顿。也没有办法看你们的代码调试问题。希望尽快修复

ZenonHuang commented 5 years ago

我目前找到了办法，避免这个问题。

有需要的朋友可以找我 : )

Matthew1874 commented 5 years ago

@ZenonHuang 你好请问怎样解决了？

ZenonHuang commented 5 years ago

留你的邮箱给我，有空发代码给你

ArchimboldiMao commented 5 years ago

@ZenonHuang 你好，请问可否公开解决代码？

bluerainxty commented 5 years ago

@ZenonHuang 你好，能否分享一下解决方法，谢谢？我的邮箱是595282304@qq.com

Matthew1874 commented 5 years ago

@ZenonHuang 你好我的邮箱是这个：670058571@qq.com 谢谢

WineKai commented 5 years ago

留你的邮箱给我，有空发代码给你

你好，能否发下解决方案。535750930@qq.com.谢谢。

ZenonHuang commented 5 years ago

已经发送给上面的各位，请查收。

ArchimboldiMao commented 5 years ago

@ZenonHuang 你好，我前面没有留邮箱，请发送一份给我。谢谢。我的邮箱 archimboldi.mao@gmail.com

WineKai commented 5 years ago

这个warning好像不影响使用，当连接xcode10时因为默认开启了main thread checker 所以会卡顿。关闭此选项或者不连xcode测试时没什么影响

wffkan commented 5 years ago

@WineKai 你好，我也遇到相似的问题，能否发下解决方案。409322456@qq.com.谢谢。

dklinzh commented 5 years ago

#if DEBUG
extension UIApplication {

    @objc
    private var __applicationState: UIApplication.State {
        if Thread.isMainThread {
            return self.__applicationState
        } else {
            var state = UIApplication.State.active
            let condition = NSCondition()
            condition.lock()
            DispatchQueue.main.async {
                state = self.__applicationState
                condition.signal()
            }
            condition.wait()
            return state
        }
    }

    /// FIXME: [UTSelfStaticsManager getAppState] called on a background thread.
    static func mainThreadApplicationState() {
        if let originalMethod = class_getInstanceMethod(UIApplication.self, #selector(getter: applicationState)),
            let swizzledMethod = class_getInstanceMethod(UIApplication.self, #selector(getter: __applicationState)) {
            method_exchangeImplementations(originalMethod, swizzledMethod)
        } else {

        }
    }
}
#endif

dklinzh commented 5 years ago

Swift 5 Updated:

#if DEBUG
extension UIApplication {

    private class ApplicationState {

        static let shared = ApplicationState()

        var current = UIApplication.State.inactive

        private init() {
            let center = NotificationCenter.default
            let mainQueue = OperationQueue.main
            center.addObserver(forName: UIApplication.didEnterBackgroundNotification, object: nil, queue: mainQueue) { (notification) in
                self.current = UIApplication.shared.applicationState
            }
            center.addObserver(forName: UIApplication.willEnterForegroundNotification, object: nil, queue: mainQueue) { (notification) in
                self.current = UIApplication.shared.applicationState
            }
            center.addObserver(forName: UIApplication.didFinishLaunchingNotification, object: nil, queue: mainQueue) { (notification) in
                self.current = UIApplication.shared.applicationState
            }
            center.addObserver(forName: UIApplication.didBecomeActiveNotification, object: nil, queue: mainQueue) { (notification) in
                self.current = UIApplication.shared.applicationState
            }
            center.addObserver(forName: UIApplication.willResignActiveNotification, object: nil, queue: mainQueue) { (notification) in
                self.current = UIApplication.shared.applicationState
            }
        }
    }

    @objc
    private var __applicationState: UIApplication.State {
        if Thread.isMainThread {
            return self.__applicationState
        } else {
            return ApplicationState.shared.current
        }
    }

    /// FIXME: -[UIApplication applicationState] called on a background thread.
    public static func mainThreadApplicationState() {
        if let originalMethod = class_getInstanceMethod(UIApplication.self, #selector(getter: applicationState)),
            let swizzledMethod = class_getInstanceMethod(UIApplication.self, #selector(getter: __applicationState)) {
            _ = ApplicationState.shared
            method_exchangeImplementations(originalMethod, swizzledMethod)
        } 
    }
}
#endif

UIApplication.mainThreadApplicationState() should be called in func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool of AppDelegate ONLY in Debug configuration.

WineKai commented 5 years ago