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Allow wkwebview to continue running (and processing javascript!) when app is in the background #45

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ghenry22 wants to merge 2 commits into from
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Allow wkwebview to continue running (and processing javascript!) when app is in the background #45

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c23ce01
attach wkwebview to keywindow so it stays active even when app is in …
ghenry22 Nov 8, 2017
f45ba4b
add _alwaysRunsAtForegroundPriority setting
ghenry22 Nov 15, 2017
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17 changes: 17 additions & 0 deletions src/ios/CDVWKWebViewEngine.m
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Original file line number Diff line number Diff line change
Expand Up @@ -105,6 +105,13 @@ @interface CDVWKWebViewEngine ()

@end

// expose private configuration value required for background operation
@interface WKWebViewConfiguration ()

@property (setter=_setAlwaysRunsAtForegroundPriority:, nonatomic) bool _alwaysRunsAtForegroundPriority;

@end

// see forwardingTargetForSelector: selector comment for the reason for this pragma
#pragma clang diagnostic ignored "-Wprotocol"

Expand All @@ -122,6 +129,9 @@ - (instancetype)initWithFrame:(CGRect)frame
if(!IsAtLeastiOSVersion(@"9.0")) {
return nil;
}
// add to keyWindow to ensure it is 'active'
[UIApplication.sharedApplication.keyWindow addSubview:self.engineWebView];

self.frame = frame;
[GCDWebServer setLogLevel: kGCDWebServerLoggingLevel_Warning];
self.webServer = [[GCDWebServer alloc] init];
Expand Down Expand Up @@ -154,6 +164,8 @@ - (WKWebViewConfiguration*) createConfigurationFromSettings:(NSDictionary*)setti
if (settings == nil) {
return configuration;
}
//required to stop wkwebview suspending in background too eagerly (as used in background mode plugin)
configuration._alwaysRunsAtForegroundPriority = [settings cordovaBoolSettingForKey:@"WKEnableBackground" defaultValue:NO];
configuration.allowsInlineMediaPlayback = [settings cordovaBoolSettingForKey:@"AllowInlineMediaPlayback" defaultValue:YES];
configuration.suppressesIncrementalRendering = [settings cordovaBoolSettingForKey:@"SuppressesIncrementalRendering" defaultValue:NO];
configuration.allowsAirPlayForMediaPlayback = [settings cordovaBoolSettingForKey:@"MediaPlaybackAllowsAirPlay" defaultValue:YES];
Expand Down Expand Up @@ -205,6 +217,8 @@ - (void)pluginInitialize
configuration.userContentController = userContentController;

// re-create WKWebView, since we need to update configuration
// remove from keyWindow before recreating
[self.engineWebView removeFromSuperview];
WKWebView* wkWebView = [[WKWebView alloc] initWithFrame:self.frame configuration:configuration];

#if __IPHONE_OS_VERSION_MAX_ALLOWED >= 110000
Expand All @@ -216,6 +230,9 @@ - (void)pluginInitialize
wkWebView.UIDelegate = self.uiDelegate;
self.engineWebView = wkWebView;

// add to keyWindow to ensure it is 'active'
[UIApplication.sharedApplication.keyWindow addSubview:self.engineWebView];

if (IsAtLeastiOSVersion(@"9.0") && [self.viewController isKindOfClass:[CDVViewController class]]) {
wkWebView.customUserAgent = ((CDVViewController*) self.viewController).userAgent;
}
Expand Down