Open an Alert asking to choose App to open map with

问题

I have a view controller with map kit integrated. I need to shoot an alert before opening that map, asking to choose from all similar applications of maps to open it with. For instance, if google maps app is installed in my iPhone, there should be an option for it, along with the default mapkit view. Is there a possibility to achieve this functionality which scans every similar app from iphone and returns the result as options to open map with.

回答1:

You can create an array of checks to map the installed apps using sumesh's answer [1]:

var installedNavigationApps : [String] = ["Apple Maps"] // Apple Maps is always installed

and with every navigation app you can think of:

if (UIApplication.sharedApplication().canOpenURL(url: NSURL)) {
        self.installedNavigationApps.append(url)
} else {
        // do nothing
}

Common navigation apps are:

Google Maps - NSURL(string:"comgooglemaps://")
Waze - NSURL(string:"waze://")
Navigon - NSURL(string:"navigon://")
TomTom - NSURL(string:"tomtomhome://")

A lot more can be found at: http://wiki.akosma.com/IPhone_URL_Schemes

After you created your list of installed navigation apps you can present an UIAlertController:

let alert = UIAlertController(title: "Selection", message: "Select Navigation App", preferredStyle: .ActionSheet)
for app in self.installNavigationApps {
    let button = UIAlertAction(title: app, style: .Default, handler: nil)
    alert.addAction(button)
}
self.presentViewController(alert, animated: true, completion: nil)

Of course you need to add the behavior of a button click in the handler with the specified urlscheme. For example if Google Maps is clicked use something like this:

UIApplication.sharedApplication().openURL(NSURL(string:
            "comgooglemaps://?saddr=&daddr=\(place.latitude),\(place.longitude)&directionsmode=driving")!) // Also from sumesh's answer

With only Apple Maps and Google Maps installed this will yield something like this:

回答2:

For anyone else looking for something similar you can now use UIActivityViewController, its the same UIControl Photos or Safari use when you click on the share button.

For apple maps and google maps you can add custom application activity to show alongside the other items. You need to subclass UIActivity and override the title and image methods. And the perform() function to handle the tap on our custom item

below is Objective C code i wrote for the same. For Swift code you can refer UIActivityViewController swift

    NSMutableArray *activityArray = [[NSMutableArray alloc] init];
// Check if google maps is installed and accordingly add it in menu
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"comgooglemaps://"]]) {
  GoogleMapsActivityView *googleMapsActivity = [[GoogleMapsActivityView alloc] init];
  [activityArray addObject:googleMapsActivity];
}
// Check if apple maps is installed and accordingly add it in menu
if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:@"maps://"]]) {
  AppleMapsActivityView *appleMapsActivity = [[AppleMapsActivityView alloc] init];
  [activityArray addObject:appleMapsActivity];
}
NSArray *currentPlaces = [NSArray arrayWithObject:place];
UIActivityViewController *activityViewController =
    [[UIActivityViewController alloc] initWithActivityItems:currentPlaces
                                      applicationActivities:activityArray];
activityViewController.excludedActivityTypes = @[UIActivityTypePrint,
                                                 UIActivityTypeCopyToPasteboard,
                                                 UIActivityTypeAssignToContact,
                                                 UIActivityTypeSaveToCameraRoll,
                                                 UIActivityTypePostToWeibo,
                                                 UIActivityTypeAddToReadingList,
                                                 UIActivityTypePostToVimeo,
                                                 UIActivityTypeAirDrop];
[self presentViewController:activityViewController animated:YES completion:nil];

And Subclass the GoogleMapsActivity

@interface GoogleMapsActivityView: UIActivity

@end

@implementation GoogleMapsActivityView

- (NSString *)activityType {
  return @"yourApp.openplace.googlemaps";
}

- (NSString *)activityTitle {
  return NSLocalizedString(@"Open with Google Maps", @"Activity view title");
}

- (UIImage *)activityImage {
  return [UIImage imageNamed:@"ic_google_maps_logo"];
}

- (UIActivityCategory)activityCategory {
  return UIActivityCategoryAction;
}

- (BOOL)canPerformWithActivityItems:(NSArray *)activityItems {
  return YES;
}

- (void)performActivity {

  CLLocationDegrees lat = 99999;
  CLLocationDegrees lng = 99999;
  NSString *latlong = [NSString stringWithFormat:@"%.7f,%@%.7f", lat, @"", lng];
  NSString *urlString = [NSString stringWithFormat:@"comgooglemaps://?q=%@", latlong];

  if ([[UIApplication sharedApplication] canOpenURL:[NSURL URLWithString:urlString]]) {
    [[UIApplication sharedApplication] openURL:[NSURL URLWithString:urlString]
                                       options:@{}
                             completionHandler:nil];
  }
  [self activityDidFinish:YES];
}

回答3:

Swift 5+

Base on @Emptyless answer.

import MapKit

func openMapButtonAction() {
        let latitude = 45.5088
        let longitude = -73.554

        let appleURL = "http://maps.apple.com/?daddr=\(latitude),\(longitude)"
        let googleURL = "comgooglemaps://?daddr=\(latitude),\(longitude)&directionsmode=driving"
        let wazeURL = "waze://?ll=\(latitude),\(longitude)&navigate=false"

        let googleItem = ("Google Map", URL(string:googleURL)!)
        let wazeItem = ("Waze", URL(string:wazeURL)!)
        var installedNavigationApps = [("Apple Maps", URL(string:appleURL)!)]

        if UIApplication.shared.canOpenURL(googleItem.1) {
            installedNavigationApps.append(googleItem)
        }

        if UIApplication.shared.canOpenURL(wazeItem.1) {
            installedNavigationApps.append(wazeItem)
        }

        let alert = UIAlertController(title: "Selection", message: "Select Navigation App", preferredStyle: .actionSheet)
        for app in installedNavigationApps {
            let button = UIAlertAction(title: app.0, style: .default, handler: { _ in
                UIApplication.shared.open(app.1, options: [:], completionHandler: nil)
            })
            alert.addAction(button)
        }
        let cancel = UIAlertAction(title: "Cancel", style: .cancel, handler: nil)
        alert.addAction(cancel)
        present(alert, animated: true)
    }

Also put these in your info.plist:

<key>LSApplicationQueriesSchemes</key>
<array>
    <string>googlechromes</string>
    <string>comgooglemaps</string>
    <string>waze</string>
</array>

Cheers!

来源：https://stackoverflow.com/questions/38250397/open-an-alert-asking-to-choose-app-to-open-map-with

标签

ios

swift

dictionary

mapkit