Exploring the functionality of WKWebView: Sending a message from JavaScript to Objective-C and receiving a return value.
For example:
let result = window.webkit.messageHandlers.name.postMessage();
Exploring the functionality of WKWebView: Sending a message from JavaScript to Objective-C and receiving a return value.
For example:
let result = window.webkit.messageHandlers.name.postMessage();
When adding a script message handler with a specific name, it will create the JavaScript function window.webkit.messageHandlers.name.postMessage(messageBody) across all frames within web views utilizing the user content controller.
After some experimenting, I discovered an alternative method by passing the WKUserScriptInjectionTimeAtDocumentStart parameters into JavaScript to access the web's localStorage.
NSString *token = [NSString stringWithFormat:@"localStorage.setItem(\"accessToken\",'%@');",@"74851c23358c"];
WKUserScript *wkUScript = [[WKUserScript alloc] initWithSource:sendToken injectionTime:WKUserScriptInjectionTimeAtDocumentStart forMainFrameOnly:NO];
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init()];
[config.userContentController addScriptMessageHandler:[[WeakScriptMessageDelegate alloc] initWithDelegate:self] name:@"iOS"];
[config.userContentController addUserScript:wkUScript];
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