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我一直在使用适用于 iOS 的 Google Maps API，并且在获得一系列新位置/位置后，我试图重新创建标记的位置。

这是我的谷歌地图代码：

- (void)loadView {

locationManager = [[CLLocationManager alloc] init];
locationManager.distanceFilter = kCLDistanceFilterNone;
locationManager.desiredAccuracy = kCLLocationAccuracyHundredMeters; // 100 m


[locationManager startUpdatingLocation];

GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:locationManager.location.coordinate.latitude
                                                        longitude:locationManager.location.coordinate.longitude                                                                 zoom:13.2];

mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
mapView.delegate = self;

self.view = mapView;
[mapView clear];
[self createMarker];

}


- (void) createMarker {

NSLog(@"createmarkers called");
AppDelegate *appDelegate = (AppDelegate *)[[UIApplication sharedApplication] delegate];
NSMutableArray *lat = [[NSMutableArray alloc]init];
NSMutableArray *lng = [[NSMutableArray alloc]init];
NSMutableArray *markers = [[NSMutableArray alloc]init];
NSMutableArray *businessArray  = [[NSMutableArray alloc]init];

for (int x = 0; x < [appDelegate.businessArray count]; x++){
    [businessArray addObject: [appDelegate.businessArray objectAtIndex:x] ];
}

for (int x = 0; x < [appDelegate.geocodedLatArrayGlobal count]; x++){
    NSNumber *latCoord = [NSNumber numberWithDouble:[[appDelegate.geocodedLatArrayGlobal objectAtIndex:x]doubleValue]];
    [lat addObject: latCoord];
}

for (int x = 0; x < [appDelegate.geocodedLngArrayGlobal count]; x++){
    NSNumber *lngCoord = [NSNumber numberWithDouble:[[appDelegate.geocodedLngArrayGlobal objectAtIndex:x]doubleValue]];
    [lng addObject:lngCoord];
}


for (int x = 0; x < [businessArray count]; x++){


    double latitude =[[lat objectAtIndex:x]doubleValue];
    double longitude =[[lng objectAtIndex:x]doubleValue];
    CLLocationCoordinate2D position = CLLocationCoordinate2DMake(latitude,longitude) ;
    GMSMarker *marker = [GMSMarker markerWithPosition:position];
    marker.title = [[businessArray objectAtIndex:x]valueForKey:@"name"];
    marker.snippet = @"123";
    marker.icon = [UIImage imageNamed:@"greenPin.png"];
    marker.animated = YES;
    marker.map = mapView;
    [markers addObject:marker];

}

}

如果我第一次加载视图，则会创建标记。但是，第二次使用新的纬度/经度坐标集/数组不会加载。

正在调用 loadview 方法，并且 [mapView clear]; 应该调用，但它不会清除地图视图上的标记。下一个问题是没有创建新标记，但我怀疑这两个问题与同一件事有关。

关于为什么地图视图无法清除的任何提示？提前致谢

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