我正在使用Google Map iOS SDK（目标C）开发应用程序。
到目前为止：
当我运行项目时，它看起来像这样。
它在缩放级别10的地图视图中同时显示标记和聚类。但是我想首先显示聚类，然后当我放大时它应该显示真实的标记。不是我创建的随机生成的标记，因为我不知道在地图中显示聚类的方法。
以下是伪URL链接的完整代码：
#import "ViewController.h"
//#import "CSMarker.h"
#import <GoogleMaps/GoogleMaps.h>
#import <Google-Maps-iOS-Utils/GMUMarkerClustering.h>
//importing POI Item object - points of interest
@interface POIItem : NSObject<GMUClusterItem>
@property(nonatomic, readonly) CLLocationCoordinate2D position;
@property(nonatomic, readonly) NSString *name;
- (instancetype)initWithPosition:(CLLocationCoordinate2D)position name:(NSString *)name;
@end
@implementation POIItem
- (instancetype)initWithPosition:(CLLocationCoordinate2D)position name:(NSString *)name {
if ((self = [super init])) {
_position = position;
_name = [name copy];
}
return self;
}
@end
//implementation start - map view controller
static const NSUInteger kClusterItemCount = 60;
static const double kCameraLatitude = 25.277683999999997;
static const double kCameraLongitude = 55.309802999999995;
@interface ViewController ()<GMUClusterManagerDelegate, GMSMapViewDelegate>
{
NSMutableArray *waypoints_;
NSMutableArray *waypointStrings_;
GMSMapView *_mapView;
GMUClusterManager *_clusterManager;
}
@property(strong, nonatomic) NSURLSession *markerSession;
@property(strong, nonatomic) GMSMapView *mapView;
@property(copy, nonatomic) NSSet *markers;
@property(nonatomic, strong) NSMutableArray *markersArray;
@end
@implementation ViewController
@synthesize gs;
- (void)viewDidLoad {
[super viewDidLoad];
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:kCameraLatitude
longitude:kCameraLongitude
zoom:10];
self.mapView =
[GMSMapView mapWithFrame:self.view.bounds camera:camera];
[self.view addSubview:self.mapView];
self.mapView.settings.compassButton = YES;
self.mapView.settings.myLocationButton = YES;
//setup the cluster manager
NSURLSessionConfiguration *config =
[NSURLSessionConfiguration defaultSessionConfiguration];
config.URLCache = [[NSURLCache alloc] initWithMemoryCapacity:2 * 1024 * 1024
diskCapacity:10 * 1024 * 1024
diskPath:@"MarkerData"];
self.markerSession = [NSURLSession sessionWithConfiguration:config];
[self downloadMarkerData];
//cluster load setup
id<GMUClusterAlgorithm> algorithm = [[GMUNonHierarchicalDistanceBasedAlgorithm alloc] init];
id<GMUClusterIconGenerator> iconGenerator = [[GMUDefaultClusterIconGenerator alloc] init];
id<GMUClusterRenderer> renderer =
[[GMUDefaultClusterRenderer alloc] initWithMapView:self.mapView
clusterIconGenerator:iconGenerator];
_clusterManager =
[[GMUClusterManager alloc] initWithMap:self.mapView algorithm:algorithm renderer:renderer];
// Generate and add random items to the cluster manager.
[self generateClusterItems];
// Call cluster() after items have been added to perform the clustering and rendering on map.
[_clusterManager cluster];
// Register self to listen to both GMUClusterManagerDelegate and GMSMapViewDelegate events.
[_clusterManager setDelegate:self mapDelegate:self];
// Do any additional setup after loading the view, typically from a nib.
}
- (NSMutableArray *)markersArray
{
if (!_markersArray) {
_markersArray = [NSMutableArray array];
}
return _markersArray;
}
- (void)didReceiveMemoryWarning {
[super didReceiveMemoryWarning];
// Dispose of any resources that can be recreated.
}
//downloading marker data
- (void)downloadMarkerData {
NSURL *lakesURL =
[NSURL URLWithString:@"http://myscrap.com/xxx.php/webservice/xxx/xxxx"];
NSURLSessionDataTask *task = [self.markerSession dataTaskWithURL:lakesURL
completionHandler:^(NSData *data, NSURLResponse *response, NSError *e)
{
NSArray *json = [NSJSONSerialization JSONObjectWithData:data
options:0
error:nil];
NSLog(@"json: %@",json);
[[NSOperationQueue mainQueue] addOperationWithBlock:^{
[self createMarkerObjectsWithJson:json];
}];
}];
[task resume];
}
-(void)drawMarkers
{
for(GMSMarker *marker in self.markers) {
if(marker.map == nil) {
marker.map = self.mapView;
}
}
}
-(void)createMarkerObjectsWithJson:(NSArray *)json
{
NSMutableSet *mutableSet = [[NSMutableSet alloc] initWithSet:self.markers];
for (NSDictionary *markerData in json) {
GMSMarker *newMarker = [[GMSMarker alloc] init];
// newMarker.appearAnimation = [markerData[@"id"] integerValue];
newMarker.position = CLLocationCoordinate2DMake([markerData[@"latitud"] doubleValue],
[markerData[@"longitude"] doubleValue]);
newMarker.title = markerData[@"name"];
newMarker.snippet = markerData[@"adress"];
// [mutableSet addObject:newMarker];
newMarker.map=self.mapView;
}
self.markers =[mutableSet copy];
[self drawMarkers];
}
#pragma mark GMUClusterManagerDelegate
- (void)clusterManager:(GMUClusterManager *)clusterManager didTapCluster:(id<GMUCluster>)cluster {
GMSCameraPosition *newCamera =
[GMSCameraPosition cameraWithTarget:cluster.position zoom:_mapView.camera.zoom + 1];
GMSCameraUpdate *update = [GMSCameraUpdate setCamera:newCamera];
[_mapView moveCamera:update];
}
#pragma mark GMSMapViewDelegate
- (BOOL)mapView:(GMSMapView *)mapView didTapMarker:(GMSMarker *)marker {
POIItem *poiItem = marker.userData;
if (poiItem != nil) {
NSLog(@"Did tap marker for cluster item %@", poiItem.name);
} else {
NSLog(@"Did tap a normal marker");
}
return NO;
}
#pragma mark Private
// Randomly generates cluster items within some extent of the camera and adds them to the
// cluster manager.
- (void)generateClusterItems {
const double extent = 0.2;
for (int index = 1; index <= kClusterItemCount; ++index) {
double lat = kCameraLatitude + extent * [self randomScale];
double lng = kCameraLongitude + extent * [self randomScale];
NSString *name = [NSString stringWithFormat:@"Item %d", index];
id<GMUClusterItem> item =
[[POIItem alloc] initWithPosition:CLLocationCoordinate2DMake(lat, lng) name:name];
[_clusterManager addItem:item];
}
}
// Returns a random value between -1.0 and 1.0.
- (double)randomScale {
return (double)arc4random() / UINT32_MAX * 2.0 - 1.0;
}
答案 0 :(得分：0)
尝试在视图中更改加载
GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:kCameraLatitude longitude:kCameraLongitude zoom:4];
缩放到5或4.然后它应显示簇而不是标记。放大时，它会显示＆＃34;真实＆＃34;标记。