CLLocationManager startUpdatingLocation不调用locationManager：didUpdateLocations：或locationManager：didFailWithError： [英] CLLocationManager startUpdatingLocation not calling locationManager:didUpdateLocations: or locationManager:didFailWithError:

问题描述

我正在尝试在我的iOS项目中使用 CLLocationManager 框架来访问用户的位置，但是当我打电话时

I'm trying to use the CLLocationManager framework in my iOS project to access the user's location but when I call

[locationManager startUpdatingLocation]

既不 locationManager：didUpdateLocations：或 locationManager：didFailWithError：正在调用。

//myViewController.h
@interface myViewController : UITableViewController <CLLocationManagerDelegate>
@end

//myViewController.m
@implementation myViewController{
    CLLocationManager *locationManager;
}

//edit
- (void)viewDidLoad
{
[super viewDidLoad];
locationManager = [[CLLocationManager alloc] init];
}
//finish edit

-(void)getLocation
{
    locationManager.delegate = self;
    locationManager.desiredAccuracy = kCLLocationAccuracyBest;
    [locationManager startUpdatingLocation];
}

- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
UIAlertView *errorAlert = [[UIAlertView alloc]
                           initWithTitle:@"Error" 
                                 message:@"Failed to Get Your Location"              
                                delegate:nil 
                       cancelButtonTitle:@"OK" 
                      otherButtonTitles:nil];
[errorAlert show];
}

- (void)locationManager:(CLLocationManager *)manager didUpdateLocations:(NSArray *)locations
{
    CLLocation *newLocation = locations[[locations count] -1];
    CLLocation *currentLocation = newLocation;
    NSString *longitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.longitude];
    NSString *latitude = [NSString stringWithFormat:@"%.8f", currentLocation.coordinate.latitude];

if (currentLocation != nil) {
   NSLog(@"latitude: %@", latitude);
   NSLog(@"longitude: @"%@", longitude);
}else {
    UIAlertView *errorAlert = [[UIAlertView alloc]
                               initWithTitle:@"Error" message:@"Failed to Get Your Location" 
                                                     delegate:nil 
                                            cancelButtonTitle:@"OK" 
                                            otherButtonTitles:nil];
    [errorAlert show];
}

}
@end

尽管委托方法都被调用了它在文档中说的是什么：

Neither delegate method is being called despite what it says in the documentation:

此方法立即返回。调用此方法会导致位置管理器获取初始位置修复（可能需要几秒钟）并通过调用其 locationManager来通知您的代理：didUpdateLocations：方法[...]除了实现 locationManager：didUpdateLocations：方法的委托对象之外，它还应该实现 locationManager：didFailWithError：方法回应潜在的错误。

"This method returns immediately. Calling this method causes the location manager to obtain an initial location fix (which may take several seconds) and notify your delegate by calling its locationManager:didUpdateLocations: method [...] In addition to your delegate object implementing the locationManager:didUpdateLocations: method, it should also implement the locationManager:didFailWithError: method to respond to potential errors."

不知道如何调试问题。

谢谢，

JA

推荐答案

只需在info.plist中添加这个

Just add this in info.plist

NSLocationAlwaysUsageDescription ---我需要位置

NSLocationAlwaysUsageDescription --- I need Location

NSLocationWhenInUseUsageDescription ---我需要位置

NSLocationWhenInUseUsageDescription --- I need Location

隐私 - 位置使用说明---我需要位置

privacy - location usage description --- I need Location

  locationManager = [[CLLocationManager alloc] init];
  locationManager.delegate=self;
  locationManager.desiredAccuracy=kCLLocationAccuracyBest;
  locationManager.distanceFilter=kCLDistanceFilterNone;
  [locationManager requestWhenInUseAuthorization];
  [locationManager startMonitoringSignificantLocationChanges];
  [locationManager startUpdatingLocation];

现在它肯定会调用你的didUpdateToLocation。

Now it will call your didUpdateToLocation definitely.

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