Open App settings from ios

ios/Classes/PermissionManager.swift

@@ -5,7 +5,9 @@
 //  Created by Maurits van Beusekom on 26/07/2018.
 //
 
+import Flutter
 import Foundation
+import UIKit
 
 class PermissionManager: NSObject {
     
@@ -16,6 +18,22 @@ class PermissionManager: NSObject {
         result(Codec.encodePermissionStatus(permissionStatus: permissionStatus))
     }
     
+    static func openAppSettings(result: @escaping FlutterResult) {
+        if #available(iOS 8.0, *) {
+            if #available(iOS 10, *) {
+                UIApplication.shared.open(URL.init(string: UIApplicationOpenSettingsURLString)!, options: [:],
+                                          completionHandler: {
+                                            (success) in result(success)
+                                          })
+            } else {
+                let success = UIApplication.shared.openURL(URL.init(string: UIApplicationOpenSettingsURLString)!)
+                result(success)
+            }
+        }
+        
+        result(false)
+    }
+    
     private static func createPermissionStrategy(permission: PermissionGroup) -> PermissionStrategy {
         switch permission {
         case PermissionGroup.calendar:

ios/Classes/SwiftPermissionHandlerPlugin.swift

@@ -21,6 +21,8 @@ public class SwiftPermissionHandlerPlugin: NSObject, FlutterPlugin {
             PermissionManager.checkPermissionStatus(
                 permission: Codec.decodePermissionGroup(from: call.arguments),
                 result: result)
+        } else if call.method == "openAppSettings" {
+            PermissionManager.openAppSettings(result: result)
         } else {
             result(FlutterMethodNotImplemented)
         }