打开一个警报，要求选择应用程序来打开地图

Question

我有一个集成了地图工具包的视图控制器。我需要在打开该地图之前发出警报，要求从所有类似的地图应用程序中进行选择以打开它。例如，如果我的 iPhone 中安装了 google maps 应用程序，则应该有一个选项，以及默认的 mapkit 视图。是否有可能实现此功能，即从 iphone 扫描每个类似的应用程序并将结果作为打开地图的选项返回。

Answer 1

基于@Angel G. Olloqui 答案的 SwiftUI 方法：

struct YourView: View {
    @State private var showingSheet = false

    var body: some View {
        VStack {
            Button(action: {
                showingSheet = true
            }) {
                Text("Navigate")
            }

        }
        .actionSheet(isPresented: $showingSheet) {
            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)
            }
            
            var buttons: [ActionSheet.Button] = []
            for app in installedNavigationApps {
                let button: ActionSheet.Button = .default(Text(app.0)) {
                    UIApplication.shared.open(app.1, options: [:], completionHandler: nil)
                }
                buttons.append(button)
            }
            let cancel: ActionSheet.Button = .cancel()
            buttons.append(cancel)
            
            return ActionSheet(title: Text("Navigate"), message: Text("Select an app..."), buttons: buttons)
        }
    }
}

另外，将以下内容添加到您的 Info.plist 中

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

Answer 2

基于先前答案的 Swift 5+ 解决方案，该解决方案显示了 Apple Maps、Google Maps、Waze 和 City Mapper 之间的选择器。它还允许一些可选的位置标题（对于那些支持它的应用程序）并且仅在有超过 1 个选项时才显示警报（如果只有 1 个，它会自动打开，如果没有，则什么也不做）。

func openMaps(latitude: Double, longitude: Double, title: String?) {
    let application = UIApplication.shared
    let coordinate = "\(latitude),\(longitude)"
    let encodedTitle = title?.addingPercentEncoding(withAllowedCharacters: .urlQueryAllowed) ?? ""
    let handlers = [
        ("Apple Maps", "http://maps.apple.com/?q=\(encodedTitle)&ll=\(coordinate)"),
        ("Google Maps", "comgooglemaps://?q=\(coordinate)"),
        ("Waze", "waze://?ll=\(coordinate)"),
        ("Citymapper", "citymapper://directions?endcoord=\(coordinate)&endname=\(encodedTitle)")
    ]
        .compactMap { (name, address) in URL(string: address).map { (name, $0) } }
        .filter { (_, url) in application.canOpenURL(url) }

    guard handlers.count > 1 else {
        if let (_, url) = handlers.first {
            application.open(url, options: [:])
        }
        return
    }
    let alert = UIAlertController(title: R.string.localizable.select_map_app(), message: nil, preferredStyle: .actionSheet)
    handlers.forEach { (name, url) in
        alert.addAction(UIAlertAction(title: name, style: .default) { _ in
            application.open(url, options: [:])
        })
    }
    alert.addAction(UIAlertAction(title: R.string.localizable.cancel(), style: .cancel, handler: nil))
    contextProvider.currentViewController.present(alert, animated: true, completion: nil)
}

请注意，此解决方案使用R.swift 进行字符串本地化，但您通常可以用NSLocalizedString 替换它们，并且它使用contextProvider.currentViewController 来获得呈现的UIViewController，但如果您可以用self 替换它已经在视图控制器中调用它了。

像往常一样，您还需要将以下内容添加到您的应用 Info.plist：

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

Answer 3

Swift 5+

基于@Emptyless 答案。

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)
    }

也将这些放在你的 info.plist 中：

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

干杯！

Answer 4

对于寻找类似东西的其他人 您现在可以使用 UIActivityViewController，它与单击共享按钮时使用的 UIControl Photos 或 Safari 相同。

对于苹果地图和谷歌地图，您可以添加自定义应用程序活动以与其他项目一起显示。您需要继承 UIActivity 并覆盖 title 和 image 方法。还有 perform() 函数来处理我们自定义项目的点击

下面是我为此编写的 Objective C 代码。 Swift 代码可以参考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];

并将 GoogleMapsActivity 子类化

@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];
}

Answer 5

您可以使用 sumesh 的回答 [1] 创建一组检查来映射已安装的应用程序：

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

你能想到的每一个导航应用：

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

常见的导航应用有：

• 谷歌地图 - NSURL(string:"comgooglemaps://")
• 位智 - NSURL(string:"waze://")
• Navigon - NSURL(string:"navigon://")
• TomTom - NSURL(string:"tomtomhome://")

更多内容请访问：http://wiki.akosma.com/IPhone_URL_Schemes

创建已安装导航应用列表后，您可以显示 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)

当然，您需要使用指定的 urlscheme 在处理程序中添加按钮单击的行为。例如，如果单击 Google 地图，请使用以下内容：

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

仅安装了 Apple Maps 和 Google Maps，这将产生如下内容：