Google 如果标记位置每秒更新一次，iOS 上的地图没有响应

Question

我下载了最新的 Google Maps for iOS SDK，根据文档与我的项目集成。地图显示正常。我有一个标记，我在线程中每隔一秒更新一次。当标记开始在地图上更新时，地图变得非常迟钝。缩放、平移等需要几秒钟时间，给人一种地图无法正常工作的感觉。有人可以帮忙吗？

第二个问题：当我不更新 UI 时，我可以缩放、平移等。那时，我覆盖在 google 地图上的地图会调整大小或四处移动，即使我正在设置要锚定图像的坐标。我如何阻止它并保持地图固定？

ViewController.h

#import <UIKit/UIKit.h>
#import <CoreLocation/CoreLocation.h>
#import <GoogleMaps/GoogleMaps.h>

@interface ViewController : UIViewController <CLLocationManagerDelegate, GMSIndoorDisplayDelegate, GMSMapViewDelegate>

@end

ViewController.m

#import "ViewController.h"

@interface ViewController ()

@property int counter;

@property (nonatomic, strong) GMSMapView *mapView;
@property (nonatomic, strong) GMSMarker *myMarker;
@property (nonatomic, strong) NSTimer *timer;
@property (nonatomic, strong) CLLocationCoordinate2D location;

@end

@implementation ViewController

- (void)viewDidLoad {
    [super viewDidLoad];
}

- (void)didReceiveMemoryWarning {
    [super didReceiveMemoryWarning];
    // Dispose of any resources that can be recreated.
}

- (void) viewDidAppear:(BOOL)animated {

    [super viewDidAppear:animated];

    GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:40.295210
                                                            longitude:-124.032841
                                                                 zoom:10.5];
    self.mapView = [GMSMapView mapWithFrame:CGRectZero camera:camera];
    self.mapView.delegate = self;

    self.view = self.mapView;
    [self.mapView setMapType:kGMSTypeHybrid];

/* Location Manager stuff */
}

- (void) viewDidDisappear:(BOOL)animated {
    [super viewDidDisappear:animated];
    [self stopSending];
}

- (void) viewWillDisappear:(BOOL)animated {
    [super viewWillDisappear:animated];
    [self stopSending];
}

- (void) overlapMap {
    self.mapView.mapType = kGMSTypeNormal;
    CLLocationCoordinate2D southWest = CLLocationCoordinate2DMake(40.295048, -124.033110);
    CLLocationCoordinate2D northEast = CLLocationCoordinate2DMake(40.295385, -124.032801);
    GMSGroundOverlay *overlay = [self setGroundOverlayWithSouthWestCoordinate:southWest AndNorthEastCoordinate:northEast AndImage:[UIImage imageNamed:@"floorplan.png"]];

    overlay.map = self.mapView;
    [self.mapView animateToCameraPosition:[GMSCameraPosition
                                           cameraWithLatitude:40.295210
                                           longitude:-124.032951
                                           zoom:30]];
    [self.mapView setUserInteractionEnabled:true];
    [self showMarkers];
}

- (void) showMarkers {
    self.timer = [NSTimer scheduledTimerWithTimeInterval:1.0 target:self selector:@selector(updateMarkerDetails) userInfo:nil repeats:YES];
}

- (void) updateMarkerDetails {

        dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{

            CLLocationCoordinate2D location = [self getLocation];


            if (CLLocationCoordinate2DIsValid(location) {
                self.myMarker = [GMSMarker markerWithPosition:location];

                self.myMarker.map = self.mapView;
                self.osLocation.map = self.mapView;

            }

            [self.mapView setSelectedMarker:self.myMarker];

            /* some code with the marker title and subtitle*/    

            dispatch_async(dispatch_get_main_queue(), ^{
                [self.myMarker setPosition:location];
            });

        });
}

- (void) clearMap {
    self.myMarker.map = nil;
    self.osLocation.map = nil;
    [self.timer invalidate];
    self.timer = nil;
}

- (CLLocationCoordinate2D) getLocation {
    return self.location;
}

/* 
Location Manager related code 
Some other proprietary code
*/

@end

Answer 1

我对问题进行了反复试验，发现当我们使用 google 地图时，所有与网络相关的操作都应该在后台线程中进行，而不是某些网络相关的操作。我没有在后台线程中执行所有与网络相关的操作。我改变了一些东西，响应能力得到了解决。

Google 如果标记位置每秒更新一次，iOS 上的地图没有响应

Google Maps on iOS is not responsive if marker position is updated every second

ios

objective-c

google-maps-sdk-ios