升级到xcode 9后，我在运行应用程序时会发出以下警告：
Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]
PID: 15473, TID: 773864, Thread name: com.google.Maps.LabelingBehavior, Queue name: com.apple.root.default-qos.overcommit, QoS: 21
Backtrace:
4 App 0x000000010b8ee524 GMSIsApplicationInBackground + 53
5 App 0x000000010b8dc77a -[GMSForegroundDispatchQueue initWithName:targetQueue:] + 269
6 App 0x000000010b9bc5ee _ZN7gmscore6vector4text8GlyphSetC2ERKNS_4base10reffed_ptrINS0_16TextureAtlasPoolEEEPU28objcproto17OS_dispatch_queue8NSObjectPK8__CTFontff + 344
7 App 0x000000010b9bba58 _ZN7gmscore6vector4text10GlyphCache11GetGlyphSetEPK8__CTFontf + 214
8 App 0x000000010b9b950e _ZN7gmscore6vector4text6GLText14PrefetchGlyphsERKNS_4base10reffed_ptrINS1_10GlyphCacheEEERKNSt3__16vectorItNS9_9allocatorItEEEEPK8__CTFontf + 22
9 App 0x000000010b9b9611 _ZN7gmscore6vector4text6GLText14PrefetchGlyphsERKNS_4base10reffed_ptrINS1_10GlyphCacheEEEPK8__CTLinebf + 207
10 App 0x000000010b9112df _ZN7gmscore6vector12GLPointLabel22PrefetchGlyphsForGroupEPNS0_12GLLabelGroupE + 181
11 App 0x000000010b911207 _ZN7gmscore6vector12GLPointLabel14PrefetchGlyphsEv + 33
12 App 0x000000010b98022a _ZN7gmscore6vector16LabelingBehavior23CreatePendingOperationsERKNSt3__13setINS_4base10reffed_ptrINS0_7GLLabelEEENS2_4lessIS7_EENS2_9allocatorIS7_EEEESE_SE_NS0_13LabelDrawModeE + 1096
13 App 0x000000010b97fb9d _ZN7gmscore6vector16LabelingBehavior14RunLabelingJobERKNS_4base10reffed_ptrINS1_11LabelingJobEEE + 357
14 App 0x000000010b97fa2a ___ZN7gmscore6vector16LabelingBehavior14CommitInternalEPNS_8renderer14EntityRendererE_block_invoke + 22
15 Foundation 0x0000000110bb0948 __NSThreadPerformPerform + 334
16 CoreFoundation 0x00000001117af2b1 __CFRUNLOOP_IS_CALLING_OUT_TO_A_SOURCE0_PERFORM_FUNCTION__ + 17
17 CoreFoundation 0x000000011184ed31 __CFRunLoopDoSource0 + 81
18 CoreFoundation 0x0000000111793c19 __CFRunLoopDoSources0 + 185
19 CoreFoundation 0x00000001117931ff __CFRunLoopRun + 1279
20 CoreFoundation 0x0000000111792a89 CFRunLoopRunSpecific + 409
21 Foundation 0x0000000110b6ae5e -[NSRunLoop(NSRunLoop) runMode:beforeDate:] + 274
22 App 0x000000010b9bace5 -[GMSx_GTMSimpleWorkerThread main] + 337
23 Foundation 0x0000000110b788ac __NSThread__start__ + 1197
24 libsystem_pthread.dylib 0x000000011323393b _pthread_body + 180
25 libsystem_pthread.dylib 0x0000000113233887 _pthread_body + 0
26 libsystem_pthread.dylib 0x000000011323308d thread_start + 13
Error Domain=kCLErrorDomain Code=0 "(null)"
当我将地图分配给视图时，我可以将其缩小到问题。
override func viewDidLoad() {
super.viewDidLoad()
UIApplication.shared.isIdleTimerDisabled = true
GPSManager.instance.startGPS()
setupLayout()
map = GMSMapView.map(withFrame: CGRect.zero, camera: getCamera(location: initialLocation, zoom: 10))
map.mapType = .hybrid
map.delegate = self
map.settings.consumesGesturesInView = false
self.view.addSubview(map) <-- This is where is goes wrong
self.view.sendSubview(toBack: map)
configureMenus()
}
这是我可以修复的东西还是在Google Maps中？欢呼
问题在Google库中。
如果您不想要这种警告，则可以在方案选项中禁用主线程检查器。
GO Product > Scheme > Manage Schemes搜索您用于测试的方案，然后按Edit...在左侧栏中按Run，然后转到Diagnostics并取消选中Main Thread Checker复选框。
如果您不想要这些警告，这只是一个时间解决方案。我不推荐它，因为如果在背景线程中调用UI，您可以介绍错误
如果您有测试，则应如我在Xcode 9，iOS 11，Xcuitest失败中所述的Test选项中禁用复选框：如果您不希望测试崩溃