WKWebView takeSnapshot does not work on iOS 13
Originator: | jnis89 | ||
Number: | rdar://FB402555 | Date Originated: | 03/6/2020 |
Status: | Resolved | Resolved: | 03/13/2020 |
Product: | WebKit | Product Version: | iOS13 |
Classification: | bug | Reproducible: | iOS13 |
I need to take a screenshot of WebView while app in Background. But on iOS13 method "takeSnapshotWithConfiguration:completionHandler:" of WKWebView does not work. completionHandler never fires when an app does a background task. This works well on iOS12. Also, it works on iOS13 while app in the foreground. Reproduce: see demo project to reproduce https://github.com/Jnis/WebView-Snapshot . Also see videos there. Expected: takeSnapshotWithConfiguration:completionHandler call completionHandler with image while app is in background Actual result: [self.wkwebView takeSnapshotWithConfiguration:configuration completionHandler:^(UIImage * _Nullable snapshotImage, NSError * _Nullable error) { // this never calls on iOS13 while app in the background. But iOS12 works well. }]; Thank you! ( https://forums.developer.apple.com/message/402555#402555 )
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Solution: setting WKSnapshotConfiguration’s afterScreenUpdates property to NO
WKSnapshotConfiguration *configuration = [WKSnapshotConfiguration new];
if (@available(iOS 13.0, *)) {
configuration.afterScreenUpdates = NO;
}