Question

我在应用程序中创建了一个带有地图的应用程序，并使用了一个按钮来更改为google.Map-App。

我的职位代码是：

-(void)locationManager:(CLLocationManager *)manager didUpdateToLocation:(CLLocation *)newLocation
      fromLocation:(CLLocation *)oldLocation {

float avgAccuracy = (newLocation.verticalAccuracy + newLocation.horizontalAccuracy)/2.0;


if (avgAccuracy < 500) {
    [locationManager stopUpdatingLocation];
    locationManager.delegate = nil;
}


storedLocation = [newLocation coordinate];

视图的代码是：

- (void)viewDidLoad {
[super viewDidLoad];

UIImage *image = [UIImage imageNamed: @"LogoNavBar.png"];
UIImageView *imageview = [[UIImageView alloc] initWithImage: image];

UIBarButtonItem *button = [[UIBarButtonItem alloc] initWithCustomView: imageview];
self.navigationItem.rightBarButtonItem = button;
[imageview release];
[button release];

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


mapView.showsUserLocation = YES;

NSLog(@"storedLocation-latitude für MKregion: %f", storedLocation.latitude);

MKCoordinateRegion region;
region.center.latitude = (storedLocation.latitude + 45.58058)/2.0;
region.center.longitude = (storedLocation.longitude - 0.546835)/2.0;
region.span.latitudeDelta = ABS(storedLocation.latitude - 45.58058);
region.span.longitudeDelta = ABS(storedLocation.longitude + 0.546835);
[mapView setRegion:region animated:TRUE];


MKCoordinateRegion hotel;
hotel.center.latitude = 45.58058;
hotel.center.longitude = -0.546835;


HotelPositionMarker* marker = [[HotelPositionMarker alloc] initWithCoordinate:hotel.center];
[mapView addAnnotation:marker];
[marker release];
}

我的问题：当“viewDidLoad”启动时，“storedLocation”仍为0.0000，获取自己的位置所需的时间比启动视图要长一些。 “viewDidLoad”-section中“storedLocation”的日志为0，而地图可见时“ - （IBAction）”中“storedLocation”的日志包含正确的值。

如何在视图加载之前管理它以获得坐标？我需要他们把关于自己的立场和我所给出的立场的观点集中。

MKCoordinateRegion region;
region.center.latitude = (storedLocation.latitude + 45.58058)/2.0;
region.center.longitude = (storedLocation.longitude - 0.546835)/2.0;
region.span.latitudeDelta = ABS(storedLocation.latitude - 45.58058);
region.span.longitudeDelta = ABS(storedLocation.longitude + 0.546835);
[mapView setRegion:region animated:TRUE];

Answer 1

尝试获取locationManager.location的值作为初始值，但可能是旧的，甚至是nil。

如果您想要当前位置，则必须等待CLLocationManager。甚至Google地图应用程序也会在显示您的位置之前等待几秒钟。

Answer 2

在使用地图调用viewController之前调用locationManager。并将locationManager作为您正在初始化和推送的viewController的成员变量传递。这是您的第一个视图，在委托中构建它。可以吗？

当前位置太慢，无法查看

2 个答案: