如何在google maps for ios中向覆盖框架添加内容

我添加了一个带有切换按钮的飞入覆盖，如GoogleMapsSDK示例中所示。我找不到如何向框架添加内容，需要添加标题/名称区域，然后在下面添加描述框。我想知道怎么做，或者是否有其他方法我应该这样做

下面是上面的sdk示例：

这是我的MapViewController.m的代码

#import "MapViewController.h"
#import <GoogleMaps/GoogleMaps.h>

static CGFloat kOverlayHeight = 180.0f;

@implementation MapViewController {
    GMSMapView *mapView_;
    UIView *_overlay;

    __strong IBOutlet UIBarButtonItem *_flyInButton;
}

- (void)viewDidLoad {

    GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:39.901379 //Tony X
                                                            longitude:-105.007308 //Tony Y
                                                                 zoom:18];
    mapView_ = [GMSMapView mapWithFrame:CGRectZero camera:camera];
    mapView_.myLocationEnabled = YES;
    mapView_.settings.myLocationButton = YES;
    mapView_.padding = UIEdgeInsetsMake(0, 0, kOverlayHeight, 0);
    mapView_.mapType = kGMSTypeHybrid;

    self.view = mapView_;

    _flyInButton = [[UIBarButtonItem alloc] initWithTitle:@"Toggle Overlay"
                                                    style:UIBarButtonItemStylePlain
                                                   target:self
                                                   action:@selector(didTapFlyIn)];
    self.navigationItem.rightBarButtonItem = _flyInButton;

    CGRect overlayFrame = CGRectMake(0, -kOverlayHeight, 0, kOverlayHeight);
    _overlay = [[UIView alloc] initWithFrame:overlayFrame];
    _overlay.autoresizingMask = UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth;

    _overlay.backgroundColor = [UIColor colorWithHue:0.0 saturation:0.0 brightness:0.0 alpha:0.9];
    [self.view addSubview:_overlay];





    /*GMSMarker *markerCaleb = [[GMSMarker alloc] init];
    markerCaleb.position = CLLocationCoordinate2DMake(39.900747, -105.00773400000003); //Caleb X, Caleb Y
    markerCaleb.title = @"Caleb's House";
    markerCaleb.snippet = @"Denver, CO";
    markerCaleb.map = mapView_; */


    // Creates a marker in the center of the map.
    GMSMarker *markerTony = [[GMSMarker alloc] init];
    markerTony.position = CLLocationCoordinate2DMake(39.901379, -105.007308); //Tony X, Tony Y
    markerTony.title = @"Mr. Tony's House";
    markerTony.snippet = @"Denver, CO";
    markerTony.map = mapView_;
}

- (void)didTapFlyIn {
    UIEdgeInsets padding = mapView_.padding;

    [UIView animateWithDuration:2.0 animations:^{
        CGSize size = self.view.bounds.size;
        if (padding.bottom == 0.0f) {
            _overlay.frame = CGRectMake(0, size.height - kOverlayHeight, size.width, kOverlayHeight);
            mapView_.padding = UIEdgeInsetsMake(0, 0, kOverlayHeight, 0);
        } else {
            _overlay.frame = CGRectMake(0, mapView_.bounds.size.height, size.width, 0);
            mapView_.padding = UIEdgeInsetsZero;
        }
    }];
}



@end

#导入“MapViewController.h”
#进口
静态CGFloat-kOverlayHeight=180.0f；
@MapViewController的实现{
GMSMapView*地图视图；
UIView*_覆盖；
__强大的IBUIBarbuttonite*飞扣；
}
-（无效）viewDidLoad{
GMSCameraPosition*摄像机=[GMSCameraPosition摄像机拍摄纬度：39.901379//Tony X
经度：-105.007308//Tony Y
缩放：18]；
地图视图=[GMSMapView地图WithFrame:CGRectZero相机：相机]；
mapView_u2;.myLocationEnabled=是；
mapView_979;.settings.myLocationButton=是；
mapView_u2;.padding=UIEdgeInsetsMake（0,0，kOverlayHeight，0）；
mapView_u2;.mapType=kGMSTypeHybrid；
self.view=mapView；
_flyInButton=[[UIBarButtonim alloc]initWithTitle:@“切换覆盖”
风格：uibarbuttonimstyleplain
目标：自我
动作：@selector（didTapFlyIn）]；
self.navigationItem.RightBarButtonim=\u flyInButton；
CGRect OVERLYFRAME=CGRectMake（0，-kOverlayHeight，0，kOverlayHeight）；
_overlay=[[UIView alloc]initWithFrame:overlayFrame]；
_overlay.autoresizingMask=UIViewAutoresizingFlexibleTopMargin | UIViewAutoresizingFlexibleWidth；
_overlay.backgroundColor=[UIColor colorWithHue:0.0饱和度：0.0亮度：0.0 alpha:0.9]；
[self.view addSubview:_overlay]；
/*GMSMarker*markerCaleb=[[GMSMarker alloc]init]；
markerCaleb.position=CLLocationCoordinate2DMake（39.900747，-105.007734000000003）；//Caleb X，Caleb Y
markerCaleb.title=@“Caleb的房子”；
markerCaleb.snippet=@“科罗拉多州丹佛市”；
markerCaleb.map=mapView*/
//在地图的中心创建一个标记。
GMSMarker*markerTony=[[GMSMarker alloc]init]；
markerTony.position=CLLocationCoordinate2DMake（39.901379，-105.007308）；//托尼X，托尼Y
markerTony.title=@“托尼先生的房子”；
markerTony.snippet=@“科罗拉多州丹佛市”；
markerTony.map=mapView；
}
-（无效）Dittapflyin{
UIEdgeInsets padding=地图视图\填充；
[UIView animateWithDuration:2.0动画：^{
CGSize size=self.view.bounds.size；
如果（padding.bottom==0.0f）{
_overlay.frame=CGRectMake（0，size.height-kOverlayHeight，size.width，kOverlayHeight）；
mapView_u2;.padding=UIEdgeInsetsMake（0,0，kOverlayHeight，0）；
}否则{
_overlay.frame=CGRectMake（0，mapView.bounds.size.height，size.width，0）；
mapView_U2;.padding=UIEdgeInsetsZero；
}
}];
}
@结束

以下是我想要的视觉效果：

谢谢