blocks|key|919294|text|可以随时频繁地调用Location委托方法。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|919295|但是，您可以使用以下算法来保护自己：|919296|创建一个全局bool，比如didFindLocation。|ordered-list-item|offset|length|style|CODE|919297|调用didFindLocation时，将startUpdatingLocation设置为startUpdatingLocation。|919298|内部委托回调didUpdateLocations:，如果didFindLocation是false，则将didFindLocation设置为true，然后调用stopUpdatingLocation。|919299|希望这能有所帮助。|919300|entityMap^0|0|0|6|4|D|F|0|2|F|K|L|18|L|0|6|J|S|F|18|5|1G|F|1Y|4|27|K|0|0^^$0|@$1|2|3|4|5|6|7|S|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|T|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|U|8|@$G|V|H|W|I|J]|$G|X|H|Y|I|J]]|9|@]|A|$]]|$1|K|3|L|5|F|7|Z|8|@$G|10|H|11|I|J]|$G|12|H|13|I|J]|$G|14|H|15|I|J]]|9|@]|A|$]]|$1|M|3|N|5|F|7|16|8|@$G|17|H|18|I|J]|$G|19|H|1A|I|J]|$G|1B|H|1C|I|J]|$G|1D|H|1E|I|J]|$G|1F|H|1G|I|J]|$G|1H|H|1I|I|J]]|9|@]|A|$]]|$1|O|3|P|5|6|7|1J|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|6|7|1K|8|@]|9|@]|A|$]]]|R|$]]

Location Manager delegate methods can be called very frequently and at any time.

You may however, apply following algorithm to safeguard yourself:

<ol>
<li>Create a global <code>bool</code> say <code>didFindLocation</code>.</li>
<li>Set <code>didFindLocation</code> to <code>false</code> when you call <code>startUpdatingLocation</code>.</li>
<li>Inside delegate call back <code>didUpdateLocations:</code>, if <code>didFindLocation</code> was <code>false</code>, set <code>didFindLocation</code> to <code>true</code> and then call <code>stopUpdatingLocation</code>.</li>
</ol>

Hope this helps.

blocks|key|919334|text|你不会经常上模拟器。在设备上，当你移动到很远的地方时，只有你得到了didUpdateLocations。只要移动在一个开放的空间，以便GPS可以识别您的设备位置，使其获得最佳的精度。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|919335|entityMap^0|X|I|0^^$0|@$1|2|3|4|5|6|7|H|8|@$9|I|A|J|B|C]]|D|@]|E|$]]|$1|F|3|-4|5|6|7|K|8|@]|D|@]|E|$]]]|G|$]]

You will not get frequently on simulator. and on device when you will move far away then only you get <code>didUpdateLocations</code>. just move in a open space so GPS can identify you device location so it get best accuracy.

blocks|key|2080082|text|最好的办法如下：|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2080083|func+locationManager(manager:+CLLocationManager,+didUpdateLocations+locations:+[CLLocation])+{
++++manager.stopUpdatingLocation()
++++manager.delegate+=+nil
}|code-block|syntax|javascript|2080084|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

The best way is do as following:

<pre><code>func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
 manager.stopUpdatingLocation()
 manager.delegate = nil
}
</code></pre>

blocks|key|919408|text|iOS+10.0%2B的最佳解决方案|type|unstyled|depth|inlineStyleRanges|entityRanges|data|919409|-+(void)locationManager:(CLLocationManager+*)manager+didUpdateLocations:(NSArray<CLLocation+*>+*)locations+{
++++[locationManager+stopUpdatingLocation];+//+stop+location+manager
++++locationManager.delegate+=+nil;
++++//Your+logics...+
++++//This+will+be+called+only+one+time+now.
}|code-block|syntax|javascript|919410|但别忘了再次设置代表。|919411|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|L|8|@]|9|@]|A|$E|F]]|$1|G|3|H|5|6|7|M|8|@]|9|@]|A|$]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

<h1>Best solution for iOS 10.0+</h1>
<pre><code>- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray&lt;CLLocation *&gt; *)locations {
 [locationManager stopUpdatingLocation]; // stop location manager
 locationManager.delegate = nil;
 //Your logics... 
 //This will be called only one time now.
}
</code></pre>
But don't forget to set the delegate again.

blocks|key|1525120|text|没有启动/结束位置更新并将委托设置为零，而是有一个名为requestLocation的方法，当您的应用程序需要快速修复用户的位置时，这个方法非常理想：|type|unstyled|depth|inlineStyleRanges|entityRanges|offset|length|data|1525121|从医生那里：|1525122|override+func+viewDidLoad()+{
++++//+Create+a+location+manager+object
++++self.locationManager+=+CLLocationManager()

++++//+Set+the+delegate
++++self.locationManager.delegate+=+self
}

func+getQuickLocationUpdate()+{
++++//+Request+location+authorization
++++self.locationManager.requestWhenInUseAuthorization()

++++//+Request+a+location+update
++++self.locationManager.requestLocation()
++++//+Note:+requestLocation+may+timeout+and+produce+an+error+if+authorization+has+not+yet+been+granted+by+the+user
}

func+locationManager(manager:+CLLocationManager,+didUpdateLocations+locations:+[CLLocation])+{
++++//+Process+the+received+location+update
}|code-block|syntax|javascript|1525123|当您想要用户的当前位置但不需要继续运行位置服务时，请使用此方法。|1525124|entityMap|0|LINK|mutability|MUTABLE|url|https://developer.apple.com/reference/corelocation/cllocationmanager/1620548-requestlocation^0|R|F|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|U|8|@]|9|@$A|V|B|W|1|X]]|C|$]]|$1|D|3|E|5|6|7|Y|8|@]|9|@]|C|$]]|$1|F|3|G|5|H|7|Z|8|@]|9|@]|C|$I|J]]|$1|K|3|L|5|6|7|10|8|@]|9|@]|C|$]]|$1|M|3|-4|5|6|7|11|8|@]|9|@]|C|$]]]|N|$O|$5|P|Q|R|C|$S|T]]]]

Instead of starting / ending the location update and setting delegate to nil, there is a method called <a href="https://developer.apple.com/reference/corelocation/cllocationmanager/1620548-requestlocation" rel="nofollow noreferrer">requestLocation</a> which is ideal when your application need quick fix on the user's location:

From the docs:

<pre><code>override func viewDidLoad() {
 // Create a location manager object
 self.locationManager = CLLocationManager()

 // Set the delegate
 self.locationManager.delegate = self
}

func getQuickLocationUpdate() {
 // Request location authorization
 self.locationManager.requestWhenInUseAuthorization()

 // Request a location update
 self.locationManager.requestLocation()
 // Note: requestLocation may timeout and produce an error if authorization has not yet been granted by the user
}

func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
 // Process the received location update
}
</code></pre>

Use this method when you want the user’s current location but do not need to leave location services running.

blocks|key|2080192|text|@Zumry+Mohamed的解决方案是正确的|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2080193|我尝试了这样的代码：|2080194|-+(void)locationManager:(CLLocationManager+*)manager+didUpdateLocations:(NSArray+*)locations+{

+++[self.locationManager+stopUpdatingLocation];
+++self.locationManager.delegate+=+nil;
+++self.locationManager+=+nil;+
}|code-block|syntax|javascript|2080195|最后，这个委托只被调用一次，我现在理解了为什么会出现问题，仅仅因为管理器调用stopUpdatingLocation方法，但是系统不能帮助我们使委托无效，所以我们可以在每次由于您的CLLocationManager的desiredAccuracy和distanceFilter属性设置而更新位置时接收回调，所以最后的解决方案就像@Zumry+Mohamed说的那样，我们可以在stopUpdateLocation时手动将委托设置为零。希望它能帮助你理解为什么这能解决问题的原因。|offset|length|style|CODE|2080196|entityMap^0|0|0|0|12|K|2I|H|30|F|3G|E|58|I|0^^$0|@$1|2|3|4|5|6|7|Q|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|R|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|S|8|@]|9|@]|A|$G|H]]|$1|I|3|J|5|6|7|T|8|@$K|U|L|V|M|N]|$K|W|L|X|M|N]|$K|Y|L|Z|M|N]|$K|10|L|11|M|N]|$K|12|L|13|M|N]]|9|@]|A|$]]|$1|O|3|-4|5|6|7|14|8|@]|9|@]|A|$]]]|P|$]]

@Zumry Mohamed 's solution is right 

i try the code like this:

<pre><code>- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations {

 [self.locationManager stopUpdatingLocation];
 self.locationManager.delegate = nil;
 self.locationManager = nil; 
}
</code></pre>

finally this delegate is called only once, i understand now why the problem is occurred, just because manager call the <code>stopUpdatingLocation</code>method but system doesn't help us to make the delegate invalid, so we can receive the callback every time location updates due to your <code>desiredAccuracy</code> and <code>distanceFilter</code> property settings of your <code>CLLocationManager</code>, so the final solution is just like what @Zumry Mohamed said, we can manually set the delegate to nil when we <code>stopUpdateLocation</code>. hope it will help you understand what happens why this could solve the problem.

blocks|key|919494|text|获得所需的纬度和经度后，只需调用stopUpdatingLocation()并将委托设置为nil。|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|919495|在Swift+3中：|919496|locationManager.stopUpdatingLocation()+
locationManager.delegate+=+nil|code-block|syntax|javascript|919497|在目标C中：|919498|[locationManager+stopUpdatingLocation]
locationManager.delegate+=+nil|919499|这里，locationManager是CLLocationManager的对象。|919500|entityMap^0|G|M|19|3|0|0|0|0|0|3|F|J|H|0^^$0|@$1|2|3|4|5|6|7|U|8|@$9|V|A|W|B|C]|$9|X|A|Y|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|Z|8|@]|D|@]|E|$]]|$1|H|3|I|5|J|7|10|8|@]|D|@]|E|$K|L]]|$1|M|3|N|5|6|7|11|8|@]|D|@]|E|$]]|$1|O|3|P|5|J|7|12|8|@]|D|@]|E|$K|L]]|$1|Q|3|R|5|6|7|13|8|@$9|14|A|15|B|C]|$9|16|A|17|B|C]]|D|@]|E|$]]|$1|S|3|-4|5|6|7|18|8|@]|D|@]|E|$]]]|T|$]]

After getting the desired latitude and longitude just call <code>stopUpdatingLocation()</code>and set the delegate to <code>nil</code>.

In Swift 3:

<pre><code>locationManager.stopUpdatingLocation() 
locationManager.delegate = nil
</code></pre>

In Objective-C:

<pre><code>[locationManager stopUpdatingLocation]
locationManager.delegate = nil
</code></pre>

Here <code>locationManager</code> is the object of <code>CLLocationManager</code>.

blocks|key|2080214|text|locationManager.startUpdatingLocation()连续地获取位置，didUpdateLocations方法多次调用，只需在调用locationManager.startUpdatingLocation()之前设置locationManager.distanceFilter值的值。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2080215|当我设置200米时(你可以根据你的要求改变)，工作正常。|2080216|++++locationManager+=+CLLocationManager()
++++locationManager.delegate+=+self
++++locationManager.desiredAccuracy+=+kCLLocationAccuracyBest
++++locationManager.distanceFilter+=+200
++++locationManager.requestWhenInUseAuthorization()
++++locationManager.startUpdatingLocation()|code-block|syntax|javascript|2080217|entityMap^0|0|0|0^^$0|@$1|2|3|4|5|6|7|K|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|L|8|@]|9|@]|A|$]]|$1|D|3|E|5|F|7|M|8|@]|9|@]|A|$G|H]]|$1|I|3|-4|5|6|7|N|8|@]|9|@]|A|$]]]|J|$]]

locationManager.startUpdatingLocation() fetch location continuously and didUpdateLocations method calls several times,
Just set the value for locationManager.distanceFilter value before calling locationManager.startUpdatingLocation().

As I set 200 meters(you can change as your requirement) working fine

<pre><code> locationManager = CLLocationManager()
 locationManager.delegate = self
 locationManager.desiredAccuracy = kCLLocationAccuracyBest
 locationManager.distanceFilter = 200
 locationManager.requestWhenInUseAuthorization()
 locationManager.startUpdatingLocation()
</code></pre>

blocks|key|1525206|text|另一种方法是设置打开和关闭委托和位置管理器的时间间隔。有点像这样|type|unstyled|depth|inlineStyleRanges|entityRanges|data|1525207|var+locationManagerUpdate:Bool+=+false+//Global

func+scheduledTimerWithTimeInterval(){
++++//+Scheduling+timer+to+Call+the+function+"updateCounting"+with+the+interval+of+10+seconds

++++++++timer+=+Timer.scheduledTimer(timeInterval:+10,+target:+self,+selector:+#selector(self.updateLocationManager),+userInfo:+nil,+repeats:+true)

}
@objc+func+updateLocationManager()+{

++++if+locationManagerUpdate+==+false+{
++++++++locationManager.delegate+=+self
++++++++locationManagerUpdate+=+true
++++}

}
extension+lm_gest:+CLLocationManagerDelegate+{

//+Handle+incoming+location+events.
func+locationManager(_+manager:+CLLocationManager,+didUpdateLocations+locations:+[CLLocation])+{


++++if+locationManagerUpdate+==+true+{
++++manager.stopUpdatingLocation()
++++manager.delegate+=+nil
++++}
//your+code+here...
}|code-block|syntax|javascript|1525208|entityMap^0|0|0^^$0|@$1|2|3|4|5|6|7|I|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|J|8|@]|9|@]|A|$E|F]]|$1|G|3|-4|5|6|7|K|8|@]|9|@]|A|$]]]|H|$]]

Another way is to set a time interval to turn on and off the delegate and so the location manager. A sorta of this

<pre><code>var locationManagerUpdate:Bool = false //Global

func scheduledTimerWithTimeInterval(){
 // Scheduling timer to Call the function "updateCounting" with the interval of 10 seconds

 timer = Timer.scheduledTimer(timeInterval: 10, target: self, selector: #selector(self.updateLocationManager), userInfo: nil, repeats: true)

}
@objc func updateLocationManager() {

 if locationManagerUpdate == false {
 locationManager.delegate = self
 locationManagerUpdate = true
 }

}
extension lm_gest: CLLocationManagerDelegate {

// Handle incoming location events.
func locationManager(_ manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {


 if locationManagerUpdate == true {
 manager.stopUpdatingLocation()
 manager.delegate = nil
 }
//your code here...
}
</code></pre>

Same code, I'm assuming that the device is actually updating the location twice for some reason, even though I only call startUpdatingLocation() once and I run some stopUpdatingLocations() inside of didUpdateLocations

<pre><code>func locationManager(manager: CLLocationManager, didUpdateLocations locations: [CLLocation]) {
 manager.stopUpdatingLocation()
 let loc: CLLocation = locations[locations.count - 1]
 let id = 0
 let type = 0
 let number = 0

 createNewDataPoint(id, loc: loc, type: type, number: number)
}
</code></pre>

In this case, createNewDataPoint gets called twice, creating 2 new datapoints. It only happens once in the simulator, so I'm assuming it has something to do with the actual device and the GPS since the simulator fakes its location.

startUpdatingLocation() is only in my code one time, on a button. Basically, you click the button, go go manager.startUpdatingLocations(), didUpdateLocations hits once on simulator, twice on device (identical coordinates) and it creates 2 new data points.

The only other code that mentions anything related is setting the accuracy, filter, authorization requests, and the previously mentioned startUpdatingLocation(). Is there something I can do to make sure I'm not creating twice as many data points as necessary?

locationManager didUpdateLocations fires twice on device, only once on simulator

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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相同的代码，我假设设备实际上出于某种原因两次更新位置，尽管我只调用了startUpdatingLocation()一次，并且在didUpdateLocations中运行了一些stopUpdatingLocations()func locationManager(manager: CLLocationManager, d...

问locationManager didUpdateLocations在设备上触发两次，在模拟器上只触发一次。
EN

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问locationManager didUpdateLocations在设备上触发两次，在模拟器上只触发一次。EN