ios 里如何判断当前应用的定位服务是否可用

如何在某个程序里面判定当前应用程序的定位服务是否可用，其实没有什么简单的方法。

这个[CLLocationManager locationServicesEnabled]检测的是整个iOS系统的位置服务开关，无法检测当前应用是否被关闭，只能通过CLLocationManagerDelegate的locationManager:didFailWithError:方法去检测：

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- (void)locationManager: (CLLocationManager *)manager

didFailWithError: (NSError *)error {

NSString *errorString;

[manager stopUpdatingLocation];

NSLog(@"Error: %@",[error localizedDescription]);

switch([error code]) {

case kCLErrorDenied:

//Access denied by user

errorString = @"Access to Location Services denied by user";

//Do something...

break;

case kCLErrorLocationUnknown:

//Probably temporary...

errorString = @"Location data unavailable";

//Do something else...

break;

default:

errorString = @"An unknown error has occurred";

break;

}

}

UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:errorString delegate:self cancelButtonTitle:@"Ok" otherButtonTitles:nil, nil];

[alert show];

[alert release];

}