xcode MKMapView didUpdateUserLocation 没有被调用
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MKMapView didUpdateUserLocation not being called
提问by user973985
I am following the big nerd ranch guide book and have modified my app delegate.h to look like this:
我正在关注大书呆子牧场指南，并将我的应用程序 delegate.h 修改为如下所示：
#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <MapKit/MapKit.h>
@interface WhereamiAppDelegate : NSObject <UIApplicationDelegate,CLLocationManagerDelegate, MKMapViewDelegate>
{
IBOutlet UITextField *locationTitleField;
IBOutlet UIActivityIndicatorView *activityIndicator;
IBOutlet MKMapView *worldView;
CLLocationManager *locationManager;
}
@property (nonatomic, retain) IBOutlet UIWindow *window;
@property (nonatomic, retain, readonly) NSManagedObjectContext *managedObjectContext;
@property (nonatomic, retain, readonly) NSManagedObjectModel *managedObjectModel;
@property (nonatomic, retain, readonly) NSPersistentStoreCoordinator *persistentStoreCoordinator;
- (void)saveContext;
- (NSURL *)applicationDocumentsDirectory;
@end
The .m looks like this:
.m 看起来像这样：
#import "WhereamiAppDelegate.h"
@implementation WhereamiAppDelegate
@synthesize window = _window;
@synthesize managedObjectContext = __managedObjectContext;
@synthesize managedObjectModel = __managedObjectModel;
@synthesize persistentStoreCoordinator = __persistentStoreCoordinator;
-(void)mapView:(MKMapView *)mapView didUpdateUserLocation:(MKUserLocation *)userLocation {
CLLocationCoordinate2D loc = [userLocation coordinate];
MKCoordinateRegion region = MKCoordinateRegionMakeWithDistance(loc, 250, 250);
[worldView setRegion:region animated:YES];
NSLog(@"didUpdateUserLocation is called");
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
// Override point for customization after application launch.
// Create location manager object
locationManager = [[CLLocationManager alloc] init];
// There will be a warning from this line of code; ignore it for now
[locationManager setDelegate:self];
// We want all results from the location manager
[locationManager setDistanceFilter:kCLDistanceFilterNone];
// And we want it to be as accurate as possible
// regardless of how much time/power it takes
[locationManager setDesiredAccuracy:kCLLocationAccuracyBest];
// Tell our manager to start looking for its location immediately
// [locationManager startUpdatingLocation];
[worldView setShowsUserLocation:YES];
// This line may say self.window, don't worry about that
[self.window makeKeyAndVisible];
return YES;
}
- (void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation fromLocation:(CLLocation *)oldLocation
{
NSLog(@"%@", newLocation);
}
- (void)locationManager:(CLLocationManager *)manager didFailWithError:(NSError *)error
{
NSLog(@"Could not find location: %@", error);
}
When I open the app it should ZOOM into my location. But it doesn't zoom, so i put an NSLog in the didUpdateUserLocation to see if it was called. But it was never printed, so it wasn't called. How do I fix this?
当我打开应用程序时，它应该放大到我的位置。但它不会缩放，所以我在 didUpdateUserLocation 中放了一个 NSLog 来查看它是否被调用。但它从未打印过，所以它没有被调用。我该如何解决？
回答by Edgar
Same thing happened to me...
同样的事情发生在我身上...
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
{
...
[worldView setDelegate:self];
...
}
Thks
谢谢
