如何在iOS上的Google地图上添加按钮？ | 如何在iOS上的Google地图上添加按钮

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问题描述

我是iOS编程的新手，我已经下载了google地图sdk的iOS，并按照他们的网站上的说明（如链接

）
，并且能够在我的应用程序中获取地图。

现在我想在谷歌地图的底部在屏幕上添加一个按钮，让用户回到选项上一个屏幕。

我只知道UIButton是UIView的子类，我们可以使一个按钮出现在视图上，使它成为该类的子视图。以前，iOS曾默认使用MKMapView使用Google地图，我在互联网上的书籍中看到了一些示例，其中显示了应用程序的屏幕截图，其中按钮或文本框会显示在地图上。但现在只需拖动界面生成器中的按钮，就不能使用google地图的SDK。

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

  #importViewController.h
 #import< MapKit / MapKit.h> 
 #import< GoogleMaps / GoogleMaps.h> 
 #import< CoreLocation / CoreLocation.h> 
 
 
 @interface ViewController（）
 
 @end 
 
 @implementation ViewController 
 {
 GMSMapView * mapView_ ; 
} 
 
  - （void）viewDidLoad 
 {
 [super viewDidLoad]; 
 //在加载视图之后执行任何其他设置，通常来自nib。 
} 
 
  - （void）didReceiveMemoryWarning 
 {
 [super didReceiveMemoryWarning]; 
 //处理可以重新创建的任何资源。 
} 
 
  - （void）loadView 
 {
 CLLocationManager * locationManager = [[CLLocationManager alloc] init]; 
 locationManager.distanceFilter = kCLDistanceFilterNone; 
 
 locationManager.desiredAccuracy = kCLLocationAccuracyKilometer; 
 [locationManager startUpdatingLocation]; 
 
 //设备当前位置的经度和纬度。 
 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]; 
 
 //创建一个GMSCameraPosition，告诉地图显示坐标
 
 GMSCameraPosition * camera = [GMSCameraPosition cameraWithLatitude：lati 
 longitude：longi 
 zoom ：11.5]; 
 
 mapView_ = [GMSMapView mapWithFrame：[[UIScreen mainScreen] bounds] camera：camera]; 
 mapView_.myLocationEnabled = YES; 
 self.view = mapView_; 
 
 //在地图中心创建一个标记。 
 GMSMarker * marker = [[GMSMarker alloc] init]; 
 marker.position = CLLocationCoordinate2DMake（lati，longi）; 
 marker.title = @It's Me; 
 marker.snippet = @我的位置; 
 marker.map = mapView_; 
 
 [mapView_ addSubview：_btn]; 
 [mapView_ bringSubviewToFront：_btn]; 
 
} 
 @end

最后2行我做了按钮的mapview的子视图，并试图带它前面。但这没有帮助。请让我知道是什么，我失踪，或者如果有另一种方法来做到这一点使用一些其他功能。

还请检查故事板的屏幕截图

谢谢。

解决方案

GMSMapView 是 UIView 的子类，因此您可以向任何其他视图添加子视图

尝试此代码

  UIButton * button = [UIButton buttonWithType：UIButtonTypeRoundedRect]; 
 button.frame = CGRectMake（mapView_.bounds.size.width  -  110，mapView_.bounds.size.height  -  30，100，20）; 
 button.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin; 
 [button setTitle：@ButtonforState：UIControlStateNormal]; 
 [mapView_ addSubview：button];

它添加 100x20 按钮作为子视图 GMSMapView ，位于右下角。我已经测试它，并且按钮可以像任何其他视图中一样触摸

编辑：
也移动所有代码从到 -viewDidLoad 。 -loadView 方法在使用IB创建UI时从未被调用。文档 -loadView 说：

编辑2：
我相信当你创建视图层次使用Interface Builder，你不能重置 self.view 属性像你在做。

在您的 -viewDidLoad

中执行此操作

  [self.view addSubview：mapView_];

而不是

  self.view = mapView_;如果您将 GMSMapView 传递给    code> self.view 属性，地图只是从这一点上看是在控制器中。我相信，这是为什么你看不到你的IB创建的按钮。
 
I am new to iOS Programming and I have downloaded the google maps sdk for iOS and followed the instruction on their website ( as shown in this link
https://developers.google.com/maps/documentation/ios/start
)
and was able to get the map in my application.

Now I am trying to add a button on the screen at the bottom over Google maps for giving an option to the user to go back to the previous screen. 

I just know that UIButton is a subclass of UIView and we can make a button appear on a view by making it the sub view of that class. Previously iOS used to use Google Maps by default by MKMapView and I have seen examples in books an on the Internet showing screen shots of apps where a button or a text box would appear on the map. But now just dragging the button in the interface builder doesn't help with the SDK of google maps.

Here is my code:

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
You can see that in the last 2 lines I have made the button the subview of mapview and tried to bring it front. But this didn't help. Please let me know what is it that I am missing or if there is another way to do this by using some other function.
Please also do check the screenshot of the storyboard which I have created so that you can understand better what I am trying to do here.
Thanks.
 解决方案 
GMSMapView is subclass of UIView so you can add subviews as to any other view
Try this code
UIButton *button = [UIButton buttonWithType:UIButtonTypeRoundedRect];
button.frame = CGRectMake(mapView_.bounds.size.width - 110, mapView_.bounds.size.height - 30, 100, 20);
button.autoresizingMask = UIViewAutoresizingFlexibleLeftMargin | UIViewAutoresizingFlexibleTopMargin;
[button setTitle:@"Button" forState:UIControlStateNormal];
[mapView_ addSubview:button];
It adds 100x20 button as the subview of the GMSMapView, positioned to the bottom right corner. I have tested it and the button can be touched as in any other view
Edit:Also move all your code from -loadView to -viewDidLoad. -loadView method is never called when using IB to create UI. Docs to -loadView says:
Edit 2:I believe when you create view hierarchy using Interface Builder, you CAN NOT reset self.view property like you are doing. 
Do this in your -viewDidLoad
[self.view addSubview: mapView_];
instead of 
self.view = mapView_;
if you are passing GMSMapView to the self.view property, the map is only view which is in the controller from this point. Thats, I believe, the reason why u can't see your IB-created button.
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