问题
I want to show all the markers that are on my map, after doing some searches I found that it should be done with GMSCoordinateBounds (Google Maps SDK) I've read the official documentation about it, but I have not understand how to use it and implement it in my code.
https://developers.google.com/maps/documentation/ios/reference/interface_g_m_s_camera_update#aa5b05606808272f9054c54af6830df3e
Here is my code
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];
CLLocationCoordinate2D location;
for (NSDictionary *dictionary in array) {
location.latitude = [dictionary[@"latitude"] floatValue];
location.longitude = [dictionary[@"longitude"] floatValue];
// Creates a marker in the center of the map.
GMSMarker *marker = [[GMSMarker alloc] init];
marker.icon = [UIImage imageNamed:(@"marker.png")];
marker.position = CLLocationCoordinate2DMake(location.latitude, location.longitude);
bounds = [bounds includingCoordinate:marker.position];
marker.title = dictionary[@"type"];
marker.map = mapView_;
}
[mapView_ animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:30.0f]];
Any help ?
回答1:
- (void)focusMapToShowAllMarkers
{
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];
for (GMSMarker *marker in <An array of your markers>)
bounds = [bounds includingCoordinate:marker.position];
[<yourMap> animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:30.0f]];
}
UPDATE:
are you sure there is nothing wrong in you array of markers and the coordinates? I've tried this code and is working perfectly. I've put this on the viewDidAppear
NSMutableArray *array = [[NSMutableArray alloc]initWithObjects:[[NSDictionary alloc]initWithObjectsAndKeys:@"44.66",@"latitude",@"21.33",@"longitude", nil],
[[NSDictionary alloc]initWithObjectsAndKeys:@"44.66",@"latitude",@"21.453",@"longitude", nil],
[[NSDictionary alloc]initWithObjectsAndKeys:@"44.44",@"latitude",@"21.993",@"longitude", nil],
[[NSDictionary alloc]initWithObjectsAndKeys:@"44.635",@"latitude",@"21.553",@"longitude", nil],
[[NSDictionary alloc]initWithObjectsAndKeys:@"44.3546",@"latitude",@"21.663",@"longitude", nil],
[[NSDictionary alloc]initWithObjectsAndKeys:@"44.6643",@"latitude",@"21.212",@"longitude", nil],
[[NSDictionary alloc]initWithObjectsAndKeys:@"44.63466",@"latitude",@"21.3523",@"longitude", nil],nil];
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] init];
CLLocationCoordinate2D location;
for (NSDictionary *dictionary in array)
{
location.latitude = [dictionary[@"latitude"] floatValue];
location.longitude = [dictionary[@"longitude"] floatValue];
// Creates a marker in the center of the map.
GMSMarker *marker = [[GMSMarker alloc] init];
marker.icon = [UIImage imageNamed:(@"marker.png")];
marker.position = CLLocationCoordinate2DMake(location.latitude, location.longitude);
bounds = [bounds includingCoordinate:marker.position];
marker.title = dictionary[@"type"];
marker.map = mapView_;
}
[mapView_ animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds withPadding:30.0f]];
This is my result:
回答2:
Swift 3 - Xcode 8
var bounds = GMSCoordinateBounds()
for marker in yourArrayOfMarkers
{
bounds = bounds.includingCoordinate(marker.position)
}
let update = GMSCameraUpdate.fit(bounds, withPadding: 60)
mapView.animate(with: update)
回答3:
Clean swift 3 version:
let bounds = markers.reduce(GMSCoordinateBounds()) {
$0.includingCoordinate($1.position)
}
mapView.animate(with: .fit(bounds, withPadding: 30.0))
回答4:
Swift solution using GMSCoordinateBounds() without path,
var bounds = GMSCoordinateBounds()
for location in locationArray
{
let latitude = location.valueForKey("latitude")
let longitude = location.valueForKey("longitude")
let marker = GMSMarker()
marker.position = CLLocationCoordinate2D(latitude:latitude, longitude:longitude)
marker.map = self.mapView
bounds = bounds.includingCoordinate(marker.position)
}
let update = GMSCameraUpdate.fitBounds(bounds, withPadding: 100)
mapView.animateWithCameraUpdate(update)
回答5:
@IBOutlet weak var mapView: GMSMapView!
let camera = GMSCameraPosition.cameraWithLatitude(23.0793, longitude:
72.4957, zoom: 5)
mapView.camera = camera
mapView.delegate = self
mapView.myLocationEnabled = true
*** arry has dictionary object which has value of Latitude and Longitude. ***
let path = GMSMutablePath()
for i in 0..<arry.count {
let dict = arry[i] as! [String:AnyObject]
let latTemp = dict["latitude"] as! Double
let longTemp = dict["longitude"] as! Double
let marker = GMSMarker()
marker.position = CLLocationCoordinate2D(latitude: latTemp, longitude: longTemp)
marker.title = "Austrilia"
marker.appearAnimation = kGMSMarkerAnimationNone
marker.map = self.mapView
path.addCoordinate(CLLocationCoordinate2DMake(latTemp, longTemp))
}
let bounds = GMSCoordinateBounds(path: path)
self.mapView!.animateWithCameraUpdate(GMSCameraUpdate.fitBounds(bounds, withPadding: 50.0))
回答6:
The easiest way I have found is to create a GMSMutablePath and then add all the coordinates of your markers to it. Then you can use the GMSCoordinateBounds initializer initWithPath: to create the bounds.
Once you have the bounds, you can create the GMSCameraUpdate and use it to animate the map to the visible bounds containing all of your markers.
For example, if you have an array of GMSMarker's:
NSArray *myMarkers; // array of marker which sets in Mapview
GMSMutablePath *path = [GMSMutablePath path];
for (GMSMarker *marker in myMarkers) {
[path addCoordinate: marker.position];
}
GMSCoordinateBounds *bounds = [[GMSCoordinateBounds alloc] initWithPath:path];
[_mapView animateWithCameraUpdate:[GMSCameraUpdate fitBounds:bounds]];
回答7:
As for Google Maps version 2.0.0 if you try to create a GMSCoordinateBounds using the default constructor GMSCoordinateBounds() and you check the "valid" flag it will be returning false and it won't make the animateWithCameraUpdate: move.
Swift 2.3 Solution
if let myLocation = mapView.myLocation {
let path = GMSMutablePath()
path.addCoordinate(myLocation.coordinate)
//add other coordinates
//path.addCoordinate(model.coordinate)
let bounds = GMSCoordinateBounds(path: path)
mapView.animateWithCameraUpdate(GMSCameraUpdate.fitBounds(bounds, withPadding: 40))
}
回答8:
We can find the same code every where , but make sure that it is in viewDidAppear() method
//bounding to a region of markers
GMSCoordinateBounds *bounds =
[[GMSCoordinateBounds alloc] initWithCoordinate:sourceMarker.position coordinate:destMarker.position];
[_mapView moveCamera:[GMSCameraUpdate fitBounds:bounds withPadding:50.0]];
回答9:
You could iterate your map markers and get the further point to the east, west, north and south and make [[GMSCoordinateBounds alloc] initWithRegion:]
回答10:
As per documentation, GMSCoordinateBounds can't be mutated.
GMSCoordinateBounds is immutable and can't be modified after construction.
- (GMSCoordinateBounds *)includingCoordinate:(CLLocationCoordinate2D)coordinate;
- (GMSCoordinateBounds *)includingBounds:(GMSCoordinateBounds *)other;
So we can mutate GMSCoordinateBounds by using above methods includingCoordinate: (for extending coordinates) and includingBounds: (for extending bounds).
So Swift code will looks like below:
var gmsBounds = GMSCoordinateBounds()
for coordinate in coordinates {
let marker = GMSMarker(position: coordinate)
gmsBounds = gmsBounds.includingCoordinate(position)
marker.map = mapView
}
mapView.animate(with: GMSCameraUpdate.fit(gmsBounds, withPadding: 30.0))
Additional Notes:
If you add custom marker view, add padding as width of marker view in addition to required padding.
来源：https://stackoverflow.com/questions/21615811/ios-how-to-use-gmscoordinatebounds-to-show-all-the-markers-of-the-map