MapboxGL Startup Infrastructure

gyp/platform-ios.gypi

@@ -17,6 +17,7 @@
         '../platform/darwin/image.mm',
         '../platform/darwin/reachability.m',
         '../include/mbgl/ios/MapboxGL.h',
+        '../platform/ios/MapboxGL.m',
         '../include/mbgl/ios/MGLMapboxEvents.h',
         '../platform/ios/MGLMapboxEvents.m',
         '../include/mbgl/ios/MGLMapView.h',

include/mbgl/ios/MGLMapView.h

@@ -20,6 +20,11 @@ IB_DESIGNABLE
 
 /** @name Initializing a Map View */
 
+/** Initialize a map view with the default style, given frame, and access token set in MapboxGL singleton.
+*   @param frame The frame with which to initialize the map view.
+*   @return An initialized map view, or `nil` if the map view was unable to be initialized. */
+- (instancetype)initWithFrame:(CGRect)frame;
+
 /** Initialize a map view with the default style and a given frame and access token.
 *   @param frame The frame with which to initialize the map view.
 *   @param accessToken A Mapbox API access token.

include/mbgl/ios/MapboxGL.h

@@ -2,3 +2,10 @@
 #import "MGLMapView.h"
 #import "MGLTypes.h"
 #import "MGLUserLocation.h"
+
+@interface MapboxGL : NSObject
+
++ (id) sharedInstanceWithAccessToken:(NSString *)token;
++ (NSString *) getAccessToken;
+
+@end

ios/app/MBXAppDelegate.m

@@ -1,11 +1,27 @@
 #import "MBXAppDelegate.h"
 #import "MBXViewController.h"
+#import <mbgl/ios/MapboxGL.h>
 #import <mbgl/ios/MGLMapboxEvents.h>
 
 @implementation MBXAppDelegate
 
 - (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions
 {
+    // Set Access Token
+    NSString *accessToken = [[NSProcessInfo processInfo] environment][@"MAPBOX_ACCESS_TOKEN"];
+    if (accessToken) {
+        // Store to preferences so that we can launch the app later on without having to specify
+        // token.
+        [[NSUserDefaults standardUserDefaults] setObject:accessToken forKey:@"access_token"];
+    } else {
+        // Try to retrieve from preferences, maybe we've stored them there previously and can reuse
+        // the token.
+        accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:@"access_token"];
+    }
+    if ( ! accessToken) NSLog(@"No access token set. Mapbox vector tiles won't work.");
+
+    [MapboxGL sharedInstanceWithAccessToken:accessToken];
+
     self.window = [[UIWindow alloc] initWithFrame:[[UIScreen mainScreen] bounds]];
     self.window.rootViewController = [[UINavigationController alloc] initWithRootViewController:[MBXViewController new]];
     [self.window makeKeyAndVisible];

ios/app/MBXViewController.mm

@@ -52,20 +52,7 @@ - (void)viewDidLoad
 {
     [super viewDidLoad];
 
-    NSString *accessToken = [[NSProcessInfo processInfo] environment][@"MAPBOX_ACCESS_TOKEN"];
-    if (accessToken) {
-        // Store to preferences so that we can launch the app later on without having to specify
-        // token.
-        [[NSUserDefaults standardUserDefaults] setObject:accessToken forKey:@"access_token"];
-    } else {
-        // Try to retrieve from preferences, maybe we've stored them there previously and can reuse
-        // the token.
-        accessToken = [[NSUserDefaults standardUserDefaults] objectForKey:@"access_token"];
-    }
-
-    if ( ! accessToken) NSLog(@"No access token set. Mapbox vector tiles won't work.");
-
-    self.mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds accessToken:accessToken];
+    self.mapView = [[MGLMapView alloc] initWithFrame:self.view.bounds];
     self.mapView.autoresizingMask = UIViewAutoresizingFlexibleWidth | UIViewAutoresizingFlexibleHeight;
     self.mapView.viewControllerForLayoutGuides = self;
     self.mapView.showsUserLocation = YES;

platform/ios/MGLMapView.mm

@@ -25,6 +25,7 @@
 #import "SMCalloutView.h"
 
 #import "MGLMapboxEvents.h"
+#import "MapboxGL.h"
 
 #import <algorithm>
 
@@ -122,6 +123,7 @@ - (instancetype)initWithFrame:(CGRect)frame
     if (self && [self commonInit])
     {
         self.styleURL = nil;
+        self.accessToken = [MapboxGL getAccessToken];
         return self;
     }
 

platform/ios/MapboxGL.m

@@ -0,0 +1,48 @@
+#import <Foundation/Foundation.h>
+
+#import "MapboxGL.h"
+#import "NSProcessInfo+MGLAdditions.h"
+
+@interface MapboxGL()
+
+@property (atomic) NSString *accessToken;
+
+@end
+
+
+@implementation MapboxGL
+
+static MapboxGL *_sharedManager;
+
+// Can be called from any thread. Called implicitly from any
+// public class convenience methods.
+//
++ (id) sharedInstanceWithAccessToken:(NSString *)token {
+    static dispatch_once_t onceToken;
+    dispatch_once(&onceToken, ^{
+        if ( ! NSProcessInfo.processInfo.mgl_isInterfaceBuilderDesignablesAgent) {
+            void (^setupBlock)() = ^{
+                _sharedManager = [[self alloc] init];
+                _sharedManager.accessToken = token;
+            };
+            if ( ! [[NSThread currentThread] isMainThread]) {
+                dispatch_sync(dispatch_get_main_queue(), ^{
+                    setupBlock();
+                });
+            }
+            else {
+                setupBlock();
+            }
+        }
+    });
+    return _sharedManager;
+}
+
++ (NSString *) getAccessToken {
+    if (_sharedManager) {
+        return _sharedManager.accessToken;
+    }
+    return nil;
+}
+
+@end