主线程检查器：在后台线程上调用UI API： - [UIApplication applicationState] [英] Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState]
问题描述
我收到一个输出到日志的错误，如下所示：
主线程检查器：在后台线程上调用的UI API： - [UIApplication applicationState]
PID：4442，TID：837820，线程名称：com.google .Maps.LabelingBehavior，队列名称：com.apple.root.default-qos.overcommit，QoS：21
为什么会这样发生在我几乎可以肯定的情况下，我并没有改变代码中主线程的任何接口元素。
让locationManager = CLLocationManager（）
$ b $ override $ $ b locationManager.requestWhenInUseAuthorization（）
如果CLLocationManager.locationServicesEnabled（）{
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMet ers
locationManager.startUpdatingLocation（）
}
viewMap.delegate = self
let camera = GMSCameraPosition.camera（withLatitude：53.7931183329367，longitude： - 1.53649874031544，zoom：17.0）
viewMap.animate（to：camera）
func locationManager经理：CLLocationManager，didUpdateLocations位置：[CLLocation]）{
let locValue：CLLocationCoordinate2D = manager.location！.coordinate
print（locations = \（locValue.latitude）\（locValue.longitude） ）
}
func mapView（_ mapView：GMSMapView，willMove gesture：Bool）{
}
func mapView（_ mapView：GMSMapView，idleAt position：GMSCameraPosition）{
if（moving> 1）{
moving = 1
UIView.animate（withDuration：0.5，delay：0，animations：{
self.topBarConstraint.constant = self.topBarConstraint.constant +（ self.topBar.bounds.height / 2）
self.bottomHalfConstraint.constant = self.bottomHalfConstraint.constant +（self.topBar.bounds.height / 2）
self .view.layoutIfNeeded（）
}，完成：无）
}
移动= 1
}
//相机更改位置这个方法会每次调用
func mapView（_mapView：GMSMapView，didChange position：GMSCameraPosition）{
moving = moving + 1
if（moving == 2）{
UIView.animate（withDuration：0.5，delay：0，animations：{
self.topBarConstraint.constant = self.topBarConstraint.constant - （self.topBar .bounds.height / 2）
self.bottomHalfConstraint.constant = self。 bottomHalfConstraint.constant - （self.topBar.bounds.height / 2）
self.view.layoutIfNeeded（）
}，completion：nil）
}
DispatchQueue.main.async {
print（Moving：\（moving）Latitude：\（self.viewMap.camera.target.latitude））
print（ Moving：\（moving）Longitude：\（self.viewMap.camera.target.longitude））
}
}
我的答案假定您已经检查过，以确保您的代码不会修改UI后台线程。
Xcode 9,10.29.17
- 更新你的豆荚。许多Cocoapod开发人员正在赶上已故的线程检查器。
- 如果可可豆开发人员没有更新他们的豆荚，那么您可以尝试联系他们或建议修改。
Xcode 9 beta $ b
注意到xcode 9测试版的新运行时崩溃与xcode 8没有一样。如果您不希望程序崩溃，则可以返回到xcode 8或禁用线程检查器，直到Apple修复新的崩溃或者你的豆荚不再触发它。
I am using google maps in Xcode 9 beta, iOS 11.
I am getting an error outputted to the log as follows:
Main Thread Checker: UI API called on a background thread: -[UIApplication applicationState] PID: 4442, TID: 837820, Thread name: com.google.Maps.LabelingBehavior, Queue name: com.apple.root.default-qos.overcommit, QoS: 21
Why would this be occurring as I am almost certain I'm not altering any interface elements from the main thread in my code.
override func viewDidLoad() {
let locationManager = CLLocationManager()
locationManager.requestAlwaysAuthorization()
locationManager.requestWhenInUseAuthorization()
if CLLocationManager.locationServicesEnabled() {
locationManager.desiredAccuracy = kCLLocationAccuracyNearestTenMeters
locationManager.startUpdatingLocation()
}
viewMap.delegate = self
let camera = GMSCameraPosition.camera(withLatitude: 53.7931183329367, longitude: -1.53649874031544, zoom: 17.0)
viewMap.animate(to: camera)
}
func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
let locValue:CLLocationCoordinate2D = manager.location!.coordinate
print("locations = \(locValue.latitude) \(locValue.longitude)")
}
func mapView(_ mapView: GMSMapView, willMove gesture: Bool) {
}
func mapView(_ mapView: GMSMapView, idleAt position: GMSCameraPosition) {
if(moving > 1){
moving = 1
UIView.animate(withDuration: 0.5, delay: 0, animations: {
self.topBarConstraint.constant = self.topBarConstraint.constant + (self.topBar.bounds.height / 2)
self.bottomHalfConstraint.constant = self.bottomHalfConstraint.constant + (self.topBar.bounds.height / 2)
self.view.layoutIfNeeded()
}, completion: nil)
}
moving = 1
}
// Camera change Position this methods will call every time
func mapView(_ mapView: GMSMapView, didChange position: GMSCameraPosition) {
moving = moving + 1
if(moving == 2){
UIView.animate(withDuration: 0.5, delay: 0, animations: {
self.topBarConstraint.constant = self.topBarConstraint.constant - (self.topBar.bounds.height / 2)
self.bottomHalfConstraint.constant = self.bottomHalfConstraint.constant - (self.topBar.bounds.height / 2)
self.view.layoutIfNeeded()
}, completion: nil)
}
DispatchQueue.main.async {
print("Moving: \(moving) Latitude: \(self.viewMap.camera.target.latitude)")
print("Moving: \(moving) Longitude: \(self.viewMap.camera.target.longitude)")
}
}
My answer assumes you have already checked to make sure your codes are not modifying the UI from a background thread.
Xcode 9, 10.29.17
- Update your pods. Many Cocoapod developers are catching up with the late thread checker.
- If the cocoa pod developer isn't updating their pod, then you can try contacting them or suggest modifications.
Xcode 9 beta
I have noticed a newly built in run time crash with xcode 9 beta that isn't there with xcode 8. If you do not want your program to crash, you can go back to xcode 8 or disable the thread checker until either Apple fixes the new crash or your pods no longer trigger it.
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