Make it work with WKWebView #198

plugin.xml

@@ -40,7 +40,6 @@
             </feature>
         </config-file>
 
-        <!-- The app is able to run in background through audio mode -->
         <config-file target="*-Info.plist" parent="UIBackgroundModes">
             <array>
                 <string>audio</string>
@@ -51,6 +50,8 @@
 
         <header-file src="src/ios/APPBackgroundMode.h" />
         <source-file src="src/ios/APPBackgroundMode.m" />
+        <header-file src="src/ios/APPMethodMagic.h" />
+        <source-file src="src/ios/APPMethodMagic.m" />
     </platform>
 
     <!-- android -->
@@ -67,11 +68,6 @@
         </config-file>
 
         <config-file target="AndroidManifest.xml" parent="/manifest/application">
-            <!--
-             * Puts the service in a foreground state, where the system considers
-             * it to be something the user is actively aware of and thus not a
-             * candidate for killing when low on memory.
-            -->
             <service android:name="de.appplant.cordova.plugin.background.ForegroundService" />
         </config-file>
 
@@ -86,32 +82,8 @@
         <source-file
             src="src/android/ForegroundService.java"
             target-dir="src/de/appplant/cordova/plugin/background" />
-
     </platform>
 
-    <!-- wp8 -->
-    <platform name="wp8">
-        <config-file target="config.xml" parent="/*">
-            <feature name="BackgroundMode">
-                <param name="wp-package" value="BackgroundMode" />
-            </feature>
-        </config-file>
-
-        <!-- The app is able to run in background through location-tracking mode -->
-        <config-file target="Properties/WMAppManifest.xml" parent="/Deployment/App/Tasks/DefaultTask">
-            <BackgroundExecution>
-                <ExecutionType Name="LocationTracking" />
-            </BackgroundExecution>
-        </config-file>
-
-        <config-file target="Properties/WMAppManifest.xml" parent="/Deployment/App/Capabilities">
-            <Capability Name="ID_CAP_LOCATION" />
-        </config-file>
-
-        <source-file src="src/wp8/BackgroundMode.cs" />
-    </platform>
-	
-
     <!-- windows -->
     <platform name="windows">
         <config-file target="config.xml" parent="/*">

src/ios/APPBackgroundMode.m

@@ -19,17 +19,32 @@
   under the License.
 */
 
+#import "APPMethodMagic.h"
 #import "APPBackgroundMode.h"
+#import <Cordova/CDVAvailability.h>
 
 @implementation APPBackgroundMode
 
+#pragma mark -
+#pragma mark Constants
+
 NSString* const kAPPBackgroundJsNamespace = @"cordova.plugins.backgroundMode";
 NSString* const kAPPBackgroundEventActivate = @"activate";
 NSString* const kAPPBackgroundEventDeactivate = @"deactivate";
 NSString* const kAPPBackgroundEventFailure = @"failure";
 
+
 #pragma mark -
-#pragma mark Initialization
+#pragma mark Life Cycle
+
+/**
+ * Called by runtime once the Class has been loaded.
+ * Exchange method implementations to hook into their execution.
+ */
++ (void) load
+{
+    [self swizzleWKWebViewEngine];
+}
 
 /**
  * Initialize the plugin.
@@ -208,4 +223,33 @@ NSString* const kAPPBackgroundEventFailure = @"failure";
     [self.commandDelegate evalJs:js];
 }
 
+#pragma mark -
+#pragma mark Swizzling
+
+/**
+ * Swizzle some implementations of CDVWKWebViewEngine.
+ */
++ (void) swizzleWKWebViewEngine
+{
+    if (!IsAtLeastiOSVersion(@"8.0"))
+        return;
+    
+    Class wkWebViewEngineCls = NSClassFromString(@"CDVWKWebViewEngine");
+    SEL selector = NSSelectorFromString(@"createConfigurationFromSettings:");
+    
+    if (!wkWebViewEngineCls)
+        return;
+    
+    SwizzleSelectorWithBlock_Begin(wkWebViewEngineCls, selector)
+    ^(CDVPlugin *self, NSDictionary *settings) {
+        id obj = ((id (*)(id, SEL, NSDictionary*))_imp)(self, _cmd, settings);
+        
+        SEL sel = NSSelectorFromString(@"_setAlwaysRunsAtForegroundPriority:");
+        ((void (*)(id, SEL, BOOL))[obj methodForSelector:selector])(obj, sel, YES);
+        
+        return sel;
+    }
+    SwizzleSelectorWithBlock_End;
+}
+
 @end

src/ios/APPMethodMagic.h

@@ -0,0 +1,93 @@
+/*
+  Copyright 2013-2017 appPlant GmbH
+
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+*/
+
+/**
+  * Code extracted from
+  * - http://defagos.github.io/yet_another_article_about_method_swizzling/
+  * - https://gist.github.com/defagos/1312fec96b48540efa5c
+  */
+
+#import <objc/runtime.h>
+#import <objc/message.h>
+
+#define SwizzleSelector(clazz, selector, newImpl, oldImpl) \
+(*oldImpl) = (__typeof((*oldImpl)))class_swizzleSelector((clazz), (selector), (IMP)(newImpl))
+
+#define SwizzleClassSelector(clazz, selector, newImpl, oldImpl) \
+(*oldImpl) = (__typeof((*oldImpl)))class_swizzleClassSelector((clazz), (selector), (IMP)(newImpl))
+
+#define SwizzleSelectorWithBlock_Begin(clazz, selector) { \
+SEL _cmd = selector; \
+__block IMP _imp = class_swizzleSelectorWithBlock((clazz), (selector),
+#define SwizzleSelectorWithBlock_End );}
+
+#define SwizzleClassSelectorWithBlock_Begin(clazz, selector) { \
+SEL _cmd = selector; \
+__block IMP _imp = class_swizzleClassSelectorWithBlock((clazz), (selector),
+#define SwizzleClassSelectorWithBlock_End );}
+
+/**
+ * Swizzle class method specified by class and selector
+ * through the provided method implementation.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ IMP ] newImpl The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleClassSelector(Class clazz, SEL selector, IMP newImpl);
+
+/**
+ * Swizzle class method specified by class and selector
+ * through the provided code block.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ id ] newImplBlock The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleClassSelectorWithBlock(Class clazz, SEL selector, id newImplBlock);
+
+/**
+ * Swizzle method specified by class and selector
+ * through the provided code block.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ id ] newImplBlock The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleSelectorWithBlock(Class clazz, SEL selector, id newImplBlock);
+
+/**
+ * Swizzle method specified by class and selector
+ * through the provided method implementation.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ IMP ] newImpl The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleSelector(Class clazz, SEL selector, IMP newImpl);

src/ios/APPMethodMagic.m

@@ -0,0 +1,106 @@
+/*
+  Copyright 2013-2017 appPlant GmbH
+
+  Licensed to the Apache Software Foundation (ASF) under one
+  or more contributor license agreements.  See the NOTICE file
+  distributed with this work for additional information
+  regarding copyright ownership.  The ASF licenses this file
+  to you under the Apache License, Version 2.0 (the
+  "License"); you may not use this file except in compliance
+  with the License.  You may obtain a copy of the License at
+
+    http://www.apache.org/licenses/LICENSE-2.0
+
+  Unless required by applicable law or agreed to in writing,
+  software distributed under the License is distributed on an
+  "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+  KIND, either express or implied.  See the License for the
+  specific language governing permissions and limitations
+  under the License.
+*/
+
+/**
+ * Code extracted from
+ * - http://defagos.github.io/yet_another_article_about_method_swizzling/
+ * - https://gist.github.com/defagos/1312fec96b48540efa5c
+ */
+
+#import "APPMethodMagic.h"
+#import <objc/runtime.h>
+#import <objc/message.h>
+
+/**
+ * Swizzle class method specified by class and selector
+ * through the provided method implementation.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ IMP ] newImpl The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleClassSelector(Class clazz, SEL selector, IMP newImpl)
+{
+    return class_swizzleSelector(object_getClass(clazz), selector, newImpl);
+}
+
+/**
+ * Swizzle class method specified by class and selector
+ * through the provided code block.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ id ] newImplBlock The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleClassSelectorWithBlock(Class clazz, SEL selector, id newImplBlock)
+{
+    IMP newImpl = imp_implementationWithBlock(newImplBlock);
+    return class_swizzleClassSelector(clazz, selector, newImpl);
+}
+
+/**
+ * Swizzle method specified by class and selector
+ * through the provided code block.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ id ] newImplBlock The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleSelectorWithBlock(Class clazz, SEL selector, id newImplBlock)
+{
+    IMP newImpl = imp_implementationWithBlock(newImplBlock);
+    return class_swizzleSelector(clazz, selector, newImpl);
+}
+
+/**
+ * Swizzle method specified by class and selector
+ * through the provided method implementation.
+ *
+ * @param [ Class ] clazz The class containing the method.
+ * @param [ SEL ] selector The selector of the method.
+ * @param [ IMP ] newImpl The new implementation of the method.
+ *
+ * @return [ IMP ] The previous implementation of the method.
+ */
+IMP class_swizzleSelector(Class clazz, SEL selector, IMP newImpl)
+{
+    Method method     = class_getInstanceMethod(clazz, selector);
+    const char *types = method_getTypeEncoding(method);
+
+    class_addMethod(clazz, selector, imp_implementationWithBlock(^(__unsafe_unretained id self, va_list argp) {
+        struct objc_super super = {
+            .receiver = self,
+            .super_class = class_getSuperclass(clazz)
+        };
+
+        id (*objc_msgSendSuper_typed)(struct objc_super*, SEL, va_list) = (void*)&objc_msgSendSuper;
+        return objc_msgSendSuper_typed(&super, selector, argp);
+    }), types);
+
+    return class_replaceMethod(clazz, selector, newImpl, types);
+}
+