[url_launcher] Removed reference to rootViewController during initialization

packages/url_launcher/CHANGELOG.md

@@ -1,3 +1,8 @@
+
+## 5.1.3
+
+* Always launch url from the top most UIViewController in iOS.
+
 ## 5.1.2
 
 * Update AGP and gradle.

packages/url_launcher/ios/Classes/UrlLauncherPlugin.m

@@ -61,33 +61,17 @@ @interface FLTUrlLauncherPlugin ()
 
 @end
 
-@interface FLTUrlLauncherPlugin ()
-
-@property(strong, nonatomic) UIViewController *viewController;
-
-@end
-
 @implementation FLTUrlLauncherPlugin
 
 + (void)registerWithRegistrar:(NSObject<FlutterPluginRegistrar> *)registrar {
   FlutterMethodChannel *channel =
       [FlutterMethodChannel methodChannelWithName:@"plugins.flutter.io/url_launcher"
                                   binaryMessenger:registrar.messenger];
-  UIViewController *viewController =
-      [UIApplication sharedApplication].delegate.window.rootViewController;
   FLTUrlLauncherPlugin *plugin =
-      [[FLTUrlLauncherPlugin alloc] initWithViewController:viewController];
+      [[FLTUrlLauncherPlugin alloc] init];
   [registrar addMethodCallDelegate:plugin channel:channel];
 }
 
-- (instancetype)initWithViewController:(UIViewController *)viewController {
-  self = [super init];
-  if (self) {
-    self.viewController = viewController;
-  }
-  return self;
-}
-
 - (void)handleMethodCall:(FlutterMethodCall *)call result:(FlutterResult)result {
   NSString *url = call.arguments[@"url"];
   if ([@"canLaunch" isEqualToString:call.method]) {
@@ -153,9 +137,9 @@ - (void)launchURLInVC:(NSString *)urlString result:(FlutterResult)result API_AVA
   self.currentSession.didFinish = ^(void) {
     weakSelf.currentSession = nil;
   };
-  [self.viewController presentViewController:self.currentSession.safari
-                                    animated:YES
-                                  completion:nil];
+  [self.topViewController presentViewController:self.currentSession.safari
+                                      animated:YES
+                                    completion:nil];
 }
 
 - (void)closeWebViewWithResult:(FlutterResult)result API_AVAILABLE(ios(9.0)) {
@@ -165,4 +149,35 @@ - (void)closeWebViewWithResult:(FlutterResult)result API_AVAILABLE(ios(9.0)) {
   result(nil);
 }
 
+- (UIViewController *)topViewController {
+  return [self topViewControllerFromViewController:[UIApplication sharedApplication].keyWindow.rootViewController];
+}
+
+/** 
+ * This method recursively iterate through the view hierarchy
+ * to return the top most view controller.
+ *
+ * It supports the following scenarios:
+ *
+ * - The view controller is presenting another view.
+ * - The view controller is a UINavigationController.
+ * - The view controller is a UITabBarController.
+ *
+ * @return The top most view controller.
+ */
+- (UIViewController *)topViewControllerFromViewController:(UIViewController *)rootViewController
+{
+  if ([rootViewController isKindOfClass:[UINavigationController class]]) {
+    UINavigationController *navigationController = (UINavigationController *)rootViewController;
+    return [self topViewControllerFromViewController:[navigationController.viewControllers lastObject]];
+  }
+  if ([rootViewController isKindOfClass:[UITabBarController class]]) {
+    UITabBarController *tabController = (UITabBarController *)rootViewController;
+    return [self topViewControllerFromViewController:tabController.selectedViewController];
+  }
+  if (rootViewController.presentedViewController) {
+    return [self topViewControllerFromViewController:rootViewController.presentedViewController];
+  }
+  return rootViewController;
+}
 @end

packages/url_launcher/pubspec.yaml

@@ -3,7 +3,7 @@ description: Flutter plugin for launching a URL on Android and iOS. Supports
   web, phone, SMS, and email schemes.
 author: Flutter Team <flutter-dev@googlegroups.com>
 homepage: https://github.com/flutter/plugins/tree/master/packages/url_launcher
-version: 5.1.2
+version: 5.1.3
 
 flutter:
   plugin: