Question

我是iOS编程的新手，对COCOA Touch知之甚少。我试图在Google地图底部的屏幕上添加一个按钮，以便用户选择返回上一个屏幕。我只知道UIButton是UIView的子类，我们可以通过使按钮成为该类的子视图来使按钮出现在视图上。以前iOS默认情况下在MKMapView中使用Google地图，我在互联网上看过书中的示例，显示应用程序的屏幕截图，其中按钮或文本框将出现在地图上。但现在只需拖动界面构建器中的按钮就无济于事了。

Text box over MKMapView

这是我的代码：

ViewController.h

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


@interface ViewController : UIViewController 

@property (weak, nonatomic) IBOutlet UIButton *btn;


@end

ViewController.m

#import "ViewController.h"
#import <MapKit/MapKit.h>
#import <GoogleMaps/GoogleMaps.h>
#import <CoreLocation/CoreLocation.h>


@interface ViewController ()

@end

@implementation ViewController
{
    GMSMapView *mapView_;
}

- (void)viewDidLoad
{
    [super viewDidLoad];
    // Do any additional setup after loading the view, typically from a nib.
}

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

- (void)loadView
{
    CLLocationManager *locationManager = [[CLLocationManager alloc] init];
    locationManager.distanceFilter = kCLDistanceFilterNone;

    locationManager.desiredAccuracy = kCLLocationAccuracyKilometer;
    [locationManager startUpdatingLocation];

    //Latitude and longitude of the current location of the device.
    double lati = locationManager.location.coordinate.latitude;
    double longi = locationManager.location.coordinate.longitude;
    NSLog(@"Latitude = %f", lati);
    NSLog(@"Longitude = %f", longi);

    CLLocation *myLocation = [[CLLocation alloc] initWithLatitude:lati longitude:longi];

    // Create a GMSCameraPosition that tells the map to display the coordinate

    GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:lati
                                                            longitude:longi
                                                                 zoom:11.5];

    mapView_ = [GMSMapView mapWithFrame:[[UIScreen mainScreen] bounds] camera:camera];
    mapView_.myLocationEnabled = YES;
    self.view = mapView_;

    // Creates a marker in the center of the map.
    GMSMarker *marker = [[GMSMarker alloc] init];
    marker.position = CLLocationCoordinate2DMake(lati, longi);
    marker.title = @"It's Me";
    marker.snippet = @"My Location";
    marker.map = mapView_;

    [mapView_ addSubview:_btn];
    [mapView_ bringSubviewToFront:_btn];

}

@end

请让我知道如何做到。

感谢。

Answer 1

在当前视图上构建正常的用户界面，然后将GMSMapView添加为subview的{{1}}（index 0）（不要做{{1} }}）

以下是重要代码：

self.view

在self.view = mapView; 0处插入地图视图会将其余对象设置在前面。

Answer 2

我建议以编程方式创建按钮，而不是使用storyBoard，我在“Google Maps SDK版本：1.4.0.4450”上进行了测试，结果确实如此。

UIButton *button    = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame        = CGRectMake(10, 10, 100, 40);
[button setTitle:@"title" forState:UIControlStateNormal];

GMSCameraPosition *camera = [GMSCameraPosition cameraWithLatitude:40.279526
                                                        longitude:-96.987305
                                                             zoom:2];

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

[self.view addSubview:button];

在iPhone中的Google地图中添加UISlider或UIButtom等子视图

2 个答案: