use WKWebView instead of deprecated UIWebView

Author: fjaeger

iOS_SDK/OneSignalSDK/Source/OneSignal.h

@@ -133,7 +133,7 @@ typedef NS_ENUM(NSUInteger, OSNotificationDisplayType) {
 @property(readonly)NSString* subtitle;
 @property(readonly)NSString* body;
 
-/* Web address to launch within the app via a UIWebView */
+/* Web address to launch within the app via a WKWebView */
 @property(readonly)NSString* launchURL;
 
 /* Additional key value properties set within the payload */

iOS_SDK/OneSignalSDK/Source/OneSignalWebView.h

@@ -26,11 +26,12 @@
  */
 
 #import <UIKit/UIKit.h>
+#import <WebKit/WebKit.h>
 
-@interface OneSignalWebView : UIViewController <UIWebViewDelegate>
+@interface OneSignalWebView : UIViewController <WKNavigationDelegate>
 
 @property(nonatomic, copy)NSURL *url;
-@property(nonatomic)UIWebView *webView;
+@property(nonatomic)WKWebView *webView;
 @property(nonatomic)UIActivityIndicatorView *uiBusy;
 
 -(void)dismiss:(id)sender;

iOS_SDK/OneSignalSDK/Source/OneSignalWebView.m

@@ -42,8 +42,8 @@ @implementation OneSignalWebView
 -(void)viewDidLoad {
     [super viewDidLoad];
 
-    _webView = [UIWebView new];
-    _webView.delegate = self;
+    _webView = [WKWebView new];
+    _webView.navigationDelegate = self;
     [self.view addSubview:_webView];
 
     [self pinSubviewToMarginsWithSubview:_webView withSuperview:self.view];
@@ -73,17 +73,19 @@ -(void)dismiss:(id)sender {
     }];
 }
 
--(void)webViewDidStartLoad:(UIWebView *)webView {
+-(void)webView:(WKWebView *)webView didStartProvisionalNavigation:(WKNavigation *)navigation {
     [_uiBusy startAnimating];
 }
 
--(void)webViewDidFinishLoad:(UIWebView *)webView {
-    self.title = [_webView stringByEvaluatingJavaScriptFromString:@"document.title"];
-    self.navigationController.title = self.title;
-    [_uiBusy stopAnimating];
+-(void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation {
+    [_webView evaluateJavaScript:@"document.title" completionHandler:^(id _Nullable result, NSError * _Nullable error) {
+        self.title = result;
+        self.navigationController.title = self.title;
+        [_uiBusy stopAnimating];
+    }];
 }
 
--(void)webView:(UIWebView *)webView didFailLoadWithError:(NSError *)error {
+-(void)webView:(WKWebView *)webView didFailNavigation:(WKNavigation *)navigation withError:(NSError *)error {
     [OneSignal onesignal_Log:ONE_S_LL_ERROR message:error.localizedDescription];
 }