是否有回调用于告知用户位置何时可用
我正在寻找一个回调或协议，当用户的位置可用时会通知我。这样，当找到用户的位置时，我可以放大他们所在的位置。我可以用什么来做到这一点？
我想 CoreLocation 中有一些东西可以做到这一点，但我找不到如何做到这一点。
[更新]
我已经使用 locationManager:didUpdateToLocation:fromLocation: 实现了
locationManager = [[[CLLocationManager alloc] init] autorelease];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
但我仍然没有收到任何位置更新。另外，如果我使用 didUpdateLocation: 那么每次更新它都会重新缩放到用户。有没有比检查是否是第一次更新更好的方法？
[更新2] 将 self. 添加到 locationManager 让它继续运行，我检查 fromLocation: 是否为 nil 来判断是否这是第一次更新。
I'm after a callback or protocol that will notify me when the user's location is available. So that when a user's location is found I can zoom into where they are. What can I use to do this?
I was thinking there waas something in CoreLocation that could do it, but I can't find how to do it.
[Update]
I've implemented <CLLocationManagerDelegate> with locationManager:didUpdateToLocation:fromLocation: and created an CLLocationManager instance.
locationManager = [[[CLLocationManager alloc] init] autorelease];
locationManager.delegate = self;
[locationManager startUpdatingLocation];
but I'm still not getting any location updates. Also if I use didUpdateLocation: then it will re-zoom to the user each update. Is there a better way than having a check to see if it's the first update?
[Update 2]
adding self. to the locationManager got it going and I checked to see if fromLocation: is nil to tell if it was the first update.
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查看 CLLocationManagerDelegate 协议，特别是 -locationManager:didUpdateToLocation:fromLocation: 。您可以从
newLocation参数的horizontalAccuracy属性获取位置读数的准确性。Look into the
CLLocationManagerDelegateprotocol, specifically-locationManager:didUpdateToLocation:fromLocation:. You can get the accuracy of the location reading from thenewLocationparameter'shorizontalAccuracyproperty.