Merge pull request #1653 from mapbox/1ec5-init-unfail

Make init methods unfailable

Author: 1ec5

include/mbgl/ios/MGLMapView.h

@@ -22,14 +22,14 @@ IB_DESIGNABLE
 
 /** Initializes and returns a newly allocated map view with the specified frame and the default style.
 *   @param frame The frame for the view, measured in points.
-*   @return An initialized map view or `nil` if the map view couldn’t be created. */
+*   @return An initialized map view. */
 - (instancetype)initWithFrame:(CGRect)frame;
 - (instancetype)initWithFrame:(CGRect)frame accessToken:(NSString *)accessToken __attribute__((unavailable("Use -initWithFrame:. Set MGLMapboxAccessToken in the Info.plist or call +[MGLAccountManager setAccessToken:].")));
 
 /** Initializes and returns a newly allocated map view with the specified frame and style URL.
 *   @param frame The frame for the view, measured in points.
 *   @param styleURL The map style URL to use. Can be either an HTTP/HTTPS URL or a Mapbox map ID style URL (`mapbox://<user.style>`).
-*   @return An initialized map view or `nil` if the map view couldn’t be created. */
+*   @return An initialized map view. */
 - (instancetype)initWithFrame:(CGRect)frame styleURL:(NSURL *)styleURL;
 - (instancetype)initWithFrame:(CGRect)frame accessToken:(NSString *)accessToken styleURL:(NSURL *)styleURL __attribute__((unavailable("Use -initWithFrame:styleURL:. Set MGLMapboxAccessToken in the Info.plist or call +[MGLAccountManager setAccessToken:].")));
 

platform/ios/MGLMapView.mm

@@ -114,41 +114,32 @@ @implementation MGLMapView
 
 - (instancetype)initWithFrame:(CGRect)frame
 {
-    self = [super initWithFrame:frame];
-
-    if (self && [self commonInit])
+    if (self = [super initWithFrame:frame])
     {
+        [self commonInit];
         self.styleURL = nil;
-        return self;
     }
-
-    return nil;
+    return self;
 }
 
 - (instancetype)initWithFrame:(CGRect)frame styleURL:(NSURL *)styleURL
 {
-    self = [super initWithFrame:frame];
-
-    if (self && [self commonInit])
+    if (self = [super initWithFrame:frame])
     {
+        [self commonInit];
         self.styleURL = styleURL;
-        return self;
     }
-
-    return nil;
+    return self;
 }
 
 - (instancetype)initWithCoder:(NSCoder *)decoder
 {
-    self = [super initWithCoder:decoder];
-
-    if (self && [self commonInit])
+    if (self = [super initWithCoder:decoder])
     {
+        [self commonInit];
         self.styleURL = nil;
-        return self;
     }
-
-    return nil;
+    return self;
 }
 
 - (NSString *)accessToken
@@ -193,20 +184,14 @@ - (void)setStyleURL:(NSURL *)styleURL
     _mbglMap->setStyleURL([[styleURL absoluteString] UTF8String]);
 }
 
-- (BOOL)commonInit
+- (void)commonInit
 {
     _isTargetingInterfaceBuilder = NSProcessInfo.processInfo.mgl_isInterfaceBuilderDesignablesAgent;
 
     // create context
     //
     _context = [[EAGLContext alloc] initWithAPI:kEAGLRenderingAPIOpenGLES2];
-
-    if ( ! _context)
-    {
-        mbgl::Log::Error(mbgl::Event::Setup, "failed to create OpenGL ES context");
-
-        return NO;
-    }
+    NSAssert(_context, @"Failed to create OpenGL ES context.");
 
     // setup accessibility
     //
@@ -394,8 +379,6 @@ - (BOOL)commonInit
         MGLEventKeyZoomLevel: @(zoom),
         MGLEventKeyPushEnabled: @([MGLMapboxEvents checkPushEnabled])
     }];
-
-    return YES;
 }
 
 -(void)reachabilityChanged:(NSNotification*)notification