[ios] properly show attribution in modal hierarchies (#8837)

fixes #8782

platform/ios/ios.xcodeproj/project.pbxproj

@@ -452,6 +452,10 @@
 		DD4823761D94AE6C00EB71B7 /* line_filter_style.json in Resources */ = {isa = PBXBuildFile; fileRef = DD4823731D94AE6C00EB71B7 /* line_filter_style.json */; };
 		DD4823771D94AE6C00EB71B7 /* numeric_filter_style.json in Resources */ = {isa = PBXBuildFile; fileRef = DD4823741D94AE6C00EB71B7 /* numeric_filter_style.json */; };
 		DD58A4C61D822BD000E1F038 /* MGLExpressionTests.mm in Sources */ = {isa = PBXBuildFile; fileRef = DD58A4C51D822BD000E1F038 /* MGLExpressionTests.mm */; };
+		DD9BE4F71EB263C50079A3AF /* UIViewController+MGLAdditions.h in Headers */ = {isa = PBXBuildFile; fileRef = DD9BE4F51EB263C50079A3AF /* UIViewController+MGLAdditions.h */; };
+		DD9BE4F81EB263C50079A3AF /* UIViewController+MGLAdditions.m in Sources */ = {isa = PBXBuildFile; fileRef = DD9BE4F61EB263C50079A3AF /* UIViewController+MGLAdditions.m */; };
+		DD9BE4F91EB263D20079A3AF /* UIViewController+MGLAdditions.h in Headers */ = {isa = PBXBuildFile; fileRef = DD9BE4F51EB263C50079A3AF /* UIViewController+MGLAdditions.h */; };
+		DD9BE4FA1EB263F40079A3AF /* UIViewController+MGLAdditions.m in Sources */ = {isa = PBXBuildFile; fileRef = DD9BE4F61EB263C50079A3AF /* UIViewController+MGLAdditions.m */; };
 		FA68F14A1E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.h in Headers */ = {isa = PBXBuildFile; fileRef = FA68F1481E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		FA68F14B1E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.h in Headers */ = {isa = PBXBuildFile; fileRef = FA68F1481E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.h */; settings = {ATTRIBUTES = (Public, ); }; };
 		FA68F14D1E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.mm in Sources */ = {isa = PBXBuildFile; fileRef = FA68F1491E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.mm */; };
@@ -919,9 +923,11 @@
 		DD4823731D94AE6C00EB71B7 /* line_filter_style.json */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.json; path = line_filter_style.json; sourceTree = "<group>"; };
 		DD4823741D94AE6C00EB71B7 /* numeric_filter_style.json */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = text.json; path = numeric_filter_style.json; sourceTree = "<group>"; };
 		DD58A4C51D822BD000E1F038 /* MGLExpressionTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = MGLExpressionTests.mm; path = ../../darwin/test/MGLExpressionTests.mm; sourceTree = "<group>"; };
+		DD9BE4F51EB263C50079A3AF /* UIViewController+MGLAdditions.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = "UIViewController+MGLAdditions.h"; sourceTree = "<group>"; };
+		DD9BE4F61EB263C50079A3AF /* UIViewController+MGLAdditions.m */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.objc; path = "UIViewController+MGLAdditions.m"; sourceTree = "<group>"; };
 		FA68F1481E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.h */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.c.h; path = MGLFillExtrusionStyleLayer.h; sourceTree = "<group>"; };
 		FA68F1491E9D656600F9F6C2 /* MGLFillExtrusionStyleLayer.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; path = MGLFillExtrusionStyleLayer.mm; sourceTree = "<group>"; };
-		FAE1CDC81E9D79C600C40B5B /* MGLFillExtrusionStyleLayerTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = MGLFillExtrusionStyleLayerTests.mm; path = ../../darwin/test/MGLFillExtrusionStyleLayerTests.mm; sourceTree = "<group>"; };
+	  FAE1CDC81E9D79C600C40B5B /* MGLFillExtrusionStyleLayerTests.mm */ = {isa = PBXFileReference; fileEncoding = 4; lastKnownFileType = sourcecode.cpp.objcpp; name = MGLFillExtrusionStyleLayerTests.mm; path = ../../darwin/test/MGLFillExtrusionStyleLayerTests.mm; sourceTree = "<group>"; };
 /* End PBXFileReference section */
 
 /* Begin PBXFrameworksBuildPhase section */
@@ -1085,12 +1091,14 @@
 		35CE617F1D4165C2004F2359 /* Categories */ = {
 			isa = PBXGroup;
 			children = (
+				357FE2DB1E02D2B20068B753 /* NSCoder+MGLAdditions.h */,
+				357FE2DC1E02D2B20068B753 /* NSCoder+MGLAdditions.mm */,
 				35CE61801D4165D9004F2359 /* UIColor+MGLAdditions.h */,
 				35CE61811D4165D9004F2359 /* UIColor+MGLAdditions.mm */,
 				30E578111DAA7D690050F07E /* UIImage+MGLAdditions.h */,
 				30E578121DAA7D690050F07E /* UIImage+MGLAdditions.mm */,
-				357FE2DB1E02D2B20068B753 /* NSCoder+MGLAdditions.h */,
-				357FE2DC1E02D2B20068B753 /* NSCoder+MGLAdditions.mm */,
+				DD9BE4F51EB263C50079A3AF /* UIViewController+MGLAdditions.h */,
+				DD9BE4F61EB263C50079A3AF /* UIViewController+MGLAdditions.m */,
 			);
 			name = Categories;
 			sourceTree = "<group>";
@@ -1637,6 +1645,7 @@
 				DA88485A1CBAFB9800AB86E3 /* MGLUserLocation_Private.h in Headers */,
 				DA27C24F1CBB4C11000B0ECD /* MGLAccountManager_Private.h in Headers */,
 				DA8847FC1CBAFA5100AB86E3 /* MGLStyle.h in Headers */,
+				DD9BE4F71EB263C50079A3AF /* UIViewController+MGLAdditions.h in Headers */,
 				DAF0D8131DFE0EC500B28378 /* MGLVectorSource_Private.h in Headers */,
 				354B83961D2E873E005D9406 /* MGLUserLocationAnnotationView.h in Headers */,
 				DA8847F01CBAFA5100AB86E3 /* MGLAnnotation.h in Headers */,
@@ -1751,6 +1760,7 @@
 				353933FF1D3FB7DD003F57D7 /* MGLSymbolStyleLayer.h in Headers */,
 				DAAF722E1DA903C700312FA4 /* MGLStyleValue_Private.h in Headers */,
 				DABFB8661CBE99E500D62B32 /* MGLPointAnnotation.h in Headers */,
+				DD9BE4F91EB263D20079A3AF /* UIViewController+MGLAdditions.h in Headers */,
 				DABFB8621CBE99E500D62B32 /* MGLOfflinePack.h in Headers */,
 				DAD1656D1CF41981001FF4B9 /* MGLFeature.h in Headers */,
 				DA17BE311CC4BDAA00402C41 /* MGLMapView_Private.h in Headers */,
@@ -2190,6 +2200,7 @@
 				DA8848541CBAFB9800AB86E3 /* MGLCompactCalloutView.m in Sources */,
 				DA8848251CBAFA6200AB86E3 /* MGLPointAnnotation.mm in Sources */,
 				35136D3C1D42272500C20EFD /* MGLCircleStyleLayer.mm in Sources */,
+				DD9BE4F81EB263C50079A3AF /* UIViewController+MGLAdditions.m in Sources */,
 				350098DE1D484E60004B2AF0 /* NSValue+MGLStyleAttributeAdditions.mm in Sources */,
 				DA6408DD1DA4E7D300908C90 /* MGLVectorStyleLayer.m in Sources */,
 				3566C7681D4A77BA008152BC /* MGLShapeSource.mm in Sources */,
@@ -2270,6 +2281,7 @@
 				DAA4E4291CBB730400178DFB /* NSBundle+MGLAdditions.m in Sources */,
 				DAA4E42E1CBB730400178DFB /* MGLAPIClient.m in Sources */,
 				35136D3D1D42272500C20EFD /* MGLCircleStyleLayer.mm in Sources */,
+				DD9BE4FA1EB263F40079A3AF /* UIViewController+MGLAdditions.m in Sources */,
 				350098DF1D484E60004B2AF0 /* NSValue+MGLStyleAttributeAdditions.mm in Sources */,
 				DA6408DE1DA4E7D300908C90 /* MGLVectorStyleLayer.m in Sources */,
 				3566C7691D4A77BA008152BC /* MGLShapeSource.mm in Sources */,

platform/ios/src/MGLMapView.mm

@@ -42,12 +42,13 @@
 
 #import "NSBundle+MGLAdditions.h"
 #import "NSDate+MGLAdditions.h"
-#import "NSString+MGLAdditions.h"
-#import "NSProcessInfo+MGLAdditions.h"
 #import "NSException+MGLAdditions.h"
+#import "NSPredicate+MGLAdditions.h"
+#import "NSProcessInfo+MGLAdditions.h"
+#import "NSString+MGLAdditions.h"
 #import "NSURL+MGLAdditions.h"
 #import "UIImage+MGLAdditions.h"
-#import "NSPredicate+MGLAdditions.h"
+#import "UIViewController+MGLAdditions.h"
 
 #import "MGLFaux3DUserLocationAnnotationView.h"
 #import "MGLUserLocationAnnotationView.h"
@@ -1946,10 +1947,7 @@ - (void)showAttribution
     attributionController.popoverPresentationController.sourceView = self;
     attributionController.popoverPresentationController.sourceRect = self.attributionButton.frame;
 
-    UIViewController *viewController = self.window.rootViewController;
-    if ([viewController isKindOfClass:[UINavigationController class]]) {
-        viewController = [(UINavigationController *)viewController viewControllers].firstObject;
-    }
+    UIViewController *viewController = [self.window.rootViewController mgl_topMostViewController];
     [viewController presentViewController:attributionController
                                  animated:YES
                                completion:NULL];

platform/ios/src/UIViewController+MGLAdditions.h

@@ -0,0 +1,11 @@
+#import <UIKit/UIKit.h>
+
+NS_ASSUME_NONNULL_BEGIN
+
+@interface UIViewController (MGLAdditions)
+
+@property (readonly) UIViewController *mgl_topMostViewController;
+
+@end
+
+NS_ASSUME_NONNULL_END

platform/ios/src/UIViewController+MGLAdditions.m

@@ -0,0 +1,22 @@
+#import "UIViewController+MGLAdditions.h"
+
+@implementation UIViewController (MGLAdditions)
+
+- (UIViewController *)mgl_topMostViewController
+{
+    if ([self isKindOfClass:[UINavigationController class]])
+    {
+        return [[(UINavigationController *)self visibleViewController] mgl_topMostViewController];
+    }
+    else if ([self isKindOfClass:[UITabBarController class]])
+    {
+        return [[(UITabBarController *)self selectedViewController] mgl_topMostViewController];
+    }
+    else if (self.presentedViewController)
+    {
+        return [self.presentedViewController mgl_topMostViewController];
+    }
+    return self;
+}
+
+@end