Example app dynamically includes Webkit if iOS 8

Author: lokimeyburg

Example Apps/ExampleApp-iOS.xcodeproj/project.pbxproj

@@ -7,7 +7,6 @@
 	objects = {
 
 /* Begin PBXBuildFile section */
-		0E3214AF19EDF7CF0075E78F /* WebKit.framework in Frameworks */ = {isa = PBXBuildFile; fileRef = 0E8082DC19EDD98700479452 /* WebKit.framework */; };
 		0E8082DB19EDC32300479452 /* WKWebViewJavascriptBridge.m in Sources */ = {isa = PBXBuildFile; fileRef = 0E8082DA19EDC32300479452 /* WKWebViewJavascriptBridge.m */; };
 		2C1562B5176B9F8400B4AE50 /* WebViewJavascriptBridge.js.txt in Resources */ = {isa = PBXBuildFile; fileRef = 2C1562B4176B9F8400B4AE50 /* WebViewJavascriptBridge.js.txt */; };
 		2C1562C0176BA63500B4AE50 /* WebViewJavascriptBridge.m in Sources */ = {isa = PBXBuildFile; fileRef = 2C1562A9176B9F6200B4AE50 /* WebViewJavascriptBridge.m */; };
@@ -50,7 +49,6 @@
 			isa = PBXFrameworksBuildPhase;
 			buildActionMask = 2147483647;
 			files = (
-				0E3214AF19EDF7CF0075E78F /* WebKit.framework in Frameworks */,
 				2CEB3EC01602563600548120 /* UIKit.framework in Frameworks */,
 				2CEB3EC21602563600548120 /* Foundation.framework in Frameworks */,
 				2CEB3EC41602563600548120 /* CoreGraphics.framework in Frameworks */,

Example Apps/ExampleApp-iOS/ExampleAppViewController.m

@@ -25,24 +25,24 @@ @implementation ExampleAppViewController
 - (void)viewWillAppear:(BOOL)animated {
     if (_bridge) { return; }
 
-    #if defined(__IPHONE_8_0)
-        WKWebView* webView = [[WKWebView alloc] initWithFrame:self.view.bounds];
+#if defined(__IPHONE_8_0)
+        WKWebView* webView = [[NSClassFromString(@"WKWebView") alloc] initWithFrame:self.view.bounds];
         webView.navigationDelegate = self;
         [self.view addSubview:webView];
         [WKWebViewJavascriptBridge enableLogging];
         _bridge = [WKWebViewJavascriptBridge bridgeForWebView:webView webViewDelegate:self handler:^(id data, WVJBResponseCallback responseCallback) {
             NSLog(@"ObjC received message from JS: %@", data);
             responseCallback(@"Response for message from ObjC");
         }];
-    #else
+#else
         UIWebView* webView = [[UIWebView alloc] initWithFrame:self.view.bounds];
         [self.view addSubview:webView];
         [WebViewJavascriptBridge enableLogging];
         _bridge = [WebViewJavascriptBridge bridgeForWebView:webView webViewDelegate:self handler:^(id data, WVJBResponseCallback responseCallback) {
             NSLog(@"ObjC received message from JS: %@", data);
             responseCallback(@"Response for message from ObjC");
         }];
-    #endif
+#endif
 
 
 

Example Apps/ExampleApp-iOS/main.m

@@ -1,10 +1,26 @@
 #import <UIKit/UIKit.h>
-
+#import <TargetConditionals.h>
+#import <dlfcn.h>
 #import "ExampleAppDelegate.h"
 
-int main(int argc, char *argv[])
+#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v)  ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
+
+int main(int argc, char * argv[])
 {
     @autoreleasepool {
+        // Dynamically load WebKit if iOS version >= 8
+        if (SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")) {
+#if TARGET_IPHONE_SIMULATOR
+            NSString *frameworkPath = [[NSProcessInfo processInfo] environment][@"DYLD_FALLBACK_FRAMEWORK_PATH"];
+            if (frameworkPath) {
+                NSString *webkitLibraryPath = [NSString pathWithComponents:@[frameworkPath, @"WebKit.framework", @"WebKit"]];
+                dlopen([webkitLibraryPath cStringUsingEncoding:NSUTF8StringEncoding], RTLD_LAZY);
+            }
+#else
+            dlopen("/System/Library/Frameworks/WebKit.framework/WebKit", RTLD_LAZY);
+#endif
+        }
+        
         return UIApplicationMain(argc, argv, nil, NSStringFromClass([ExampleAppDelegate class]));
     }
-}
+}