ios - 未调用 CoreLocation 区域委托(delegate)
<p><p>iOS 5 中的 CoreLocation 区域委托(delegate)方法在模拟器和设备上都有问题。我正在尝试添加一个区域进行监控，然后等待 <code>didStartMonitoring</code> 委托(delegate)回调。很少，它工作正常。但是，通常不会调用 <code>didStartMonitoring</code> 和 <code>monitoringDidFail</code>。该区域确实被添加到 <code>monitoredRegions</code>。委托(delegate)对象设置正确，通常会调用 <code>didEnterRegion</code> 和 <code>didExitRegion</code>。位置管理器永远不会被释放。这是在 <a href="https://stackoverflow.com/questions/3731881/why-is-my-cllocationmanager-delegate-not-getting-called" rel="noreferrer noopener nofollow">main thread</a> .我已经检查了我能想到的所有条件。</p>
<pre><code>-(id) init
{
self = ;
if( self ) {
NSLog( @"initializing location manager" );
self.locationManager = [ init];
locationManager.delegate = self;
;
}
return self;
}
-(void) startMonitoringRegion
{
BOOL monitoring = NO;
if ( ) {
if ( ) {
if( == kCLAuthorizationStatusAuthorized ) {
monitoring = YES;
} else {
NSLog( @"app is not authorized for location monitoring" );
}
} else {
NSLog( @"region monitoring is not enabled" );
}
} else {
NSLog( @"region monitoring is not available" );
}
if( !monitoring ) return;
CLRegion *region = [ initCircularRegionWithCenter:locationManager.location.coordinate
radius:50
identifier:@"majorRegion"];
NSLog( @"trying to start monitoring for region %@", region );
;
}
-(void) locationManager:(CLLocationManager*)manager
didStartMonitoringForRegion:(CLRegion*)region
{
NSLog( @"region monitoring started" );
}
- (void) locationManager:(CLLocationManager *)manager
monitoringDidFailForRegion:(CLRegion *)region
withError:(NSError *)error
{
NSLog( @"region monitoring failed" );
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog( @"location manager failed" );
}
</code></pre>
<p>有人有什么想法吗？我可以处理这个问题，但似乎 <code>didEnterRegion</code> 和 <code>didExitRegion</code> 委托(delegate)方法有时也不一致，这对我来说是个大问题。</p>
<p>编辑:我可以在单个应用程序委托(delegate)中复制此功能——无需自定义对象或任何东西。请参阅下面的实现。区域被添加(打印时看到)，但 <code>didStartMonitoringRegion</code> 永远不会被调用。</p>
<pre><code>@implementation AppDelegate
@synthesize window = _window;
@synthesize locationManager;
-(void) startMonitoringRegion
{
BOOL monitoring = NO;
if ( ) {
if ( ) {
if( == kCLAuthorizationStatusAuthorized ){
monitoring = YES;
} else {
NSLog( @"app is not authorized for location monitoring" );
}
} else {
NSLog( @"region monitoring is not enabled" );
}
} else {
NSLog( @"region monitoring is not available" );
}
if( !monitoring ) return;
CLRegion *region = [ initCircularRegionWithCenter:locationManager.location.coordinate
radius:50.
identifier:@"majorRegion"];
NSLog( @"trying to start monitoring for region %@", region );
;
}
-(void) printMonitoredRegions
{
NSLog( @"printing regions:" );
for( CLRegion* region in locationManager.monitoredRegions )
NSLog( @"%@", region );
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
NSLog( @"initializing location manager" );
self.locationManager = [ init];
locationManager.delegate = self;
;
;
;
return YES;
}
- (void)locationManager:(CLLocationManager *)manager
didUpdateToLocation:(CLLocation *)newLocation
fromLocation:(CLLocation *)oldLocation
{
//NSLog( @"location updated" );
}
-(void) locationManager:(CLLocationManager*)manager
didStartMonitoringForRegion:(CLRegion*)region
{
NSLog( @"region monitoring started" );
}
-(void) locationManager:(CLLocationManager*)manager didEnterRegion:(CLRegion*)region
{
NSLog( @"did enter region" );
}
-(void) locationManager:(CLLocationManager*)manager didExitRegion:(CLRegion*)region
{
NSLog( @"did exit region" );
}
- (void) locationManager:(CLLocationManager *)manager
monitoringDidFailForRegion:(CLRegion *)region
withError:(NSError *)error
{
NSLog( @"region monitoring failed" );
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog( @"location manager failed" );
}
@end
</code></pre>
<p>日志:</p>
<pre><code>2012-02-21 10:53:50.397 locationtest initializing location manager
2012-02-21 10:53:50.412 locationtest trying to start monitoring for region (identifier majorRegion) <LAT,LONG> radius 50.00m
2012-02-21 10:53:52.414 locationtest printing regions:
2012-02-21 10:53:52.416 locationtest (identifier majorRegion <LAT,LONG> radius 50.00m
</code></pre>
<p>编辑 2:我刚刚注意到 <a href="https://developer.apple.com/library/ios/#documentation/CoreLocation/Reference/CLLocationManagerDelegate_Protocol/CLLocationManagerDelegate/CLLocationManagerDelegate.html#//apple_ref/doc/uid/TP40007124" rel="noreferrer noopener nofollow">iOS implementation</a> <code>CLLocationManagerDelegate</code> 协议(protocol)与 <a href="https://developer.apple.com/library/mac/#documentation/CoreLocation/Reference/CLLocationManagerDelegate_Protocol/CLLocationManagerDelegate/CLLocationManagerDelegate.html#//apple_ref/doc/uid/TP40007124" rel="noreferrer noopener nofollow">Mac implementation</a> 略有不同。 -- 值得注意的是，Mac 没有 <code>didStartMonitoringRegion</code>。有没有什么方法我不小心使用了 Mac 库而不是 iOS 库？</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>看看苹果怎么说:</p>
<p> <a href="http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/LocationAwarenessPG/CoreLocation/CoreLocation.html" rel="noreferrer noopener nofollow">http://developer.apple.com/library/ios/#documentation/userexperience/conceptual/LocationAwarenessPG/CoreLocation/CoreLocation.html</a> </p>
<p><strong>测试您应用的区域监控支持</strong></p>
<p><em>在 iOS 模拟器或设备上测试您的区域监控代码时，请意识到区域事件可能不会在跨越区域边界后立即发生。为了防止虚假通知，iOS 在满足某些阈值条件之前不会发送区域通知。具体来说，用户的位置必须越过区域边界并从该边界移开最小距离，并在报告通知之前保持该最小距离至少 20 秒。</em></p>
<p><em>具体的阈值距离由硬件和当前可用的定位技术决定。例如，如果禁用 Wi-Fi，则区域监控的准确性会大大降低。但是，出于测试目的，您可以假设最短距离约为 200 米。</em></p></p>
<p style="font-size: 20px;">关于ios - 未调用 CoreLocation 区域委托(delegate)，我们在Stack Overflow上找到一个类似的问题：
<a href="https://stackoverflow.com/questions/9320185/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/9320185/
</a>
</p>
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