gpt4 book ai didi

ios - UIPrintInteractionController 始终显示当前 WKWebView 而不是 iFrame 内容

转载 作者:行者123 更新时间:2023-11-29 13:55:35 27 4
gpt4 key购买 nike

我有两个网页:/invoice_display,其中显示发票并有一个“打印”按钮。 “打印”按钮创建一个隐藏的 iFrame 并将源设置为 /invoice_printable,它有一个嵌入在页面加载时执行的页面中的 window.print()

这一切在网络浏览器中运行良好,但在 iOS 上加载 WKWebView 时遇到问题。问题是 UIPrintInteractionController 预览总是显示 /invoice_display 而不是 /invoice_printable

这是当前代码:

/invoice_printable

<script type="text/javascript">
window.onload = function () {
window.print();
}
</script>

UIViewController

- (void)createWebView {
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
WKUserScript *script = [[WKUserScript alloc] initWithSource:@"window.print = function() { window.webkit.messageHandlers.print.postMessage('print') }"
injectionTime:WKUserScriptInjectionTimeAtDocumentEnd
forMainFrameOnly:NO];
[config.userContentController addUserScript:script];
[config.userContentController addScriptMessageHandler:self name:@"print"];

WKWebView *webView = [[WKWebView alloc] initWithFrame:CGRectZero configuration:config];
webView.navigationDelegate = self;
webView.UIDelegate = self;

[self.view addSubview:webView];
self.webView = webView;
}

- (void)printCurrentPage {
UIPrintInteractionController *printInteractionController = [UIPrintInteractionController sharedPrintController];
printInteractionController.printFormatter = self.webView.viewPrintFormatter;
UIPrintInteractionCompletionHandler completionHandler = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
if (!completed) {
if (error) {
NSLog(@"Print failed: %@", error);
} else {
NSLog(@"Print cancelled");
}
}
};

[printInteractionController presentAnimated:YES completionHandler:completionHandler];
}

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
if ([message.name isEqualToString:@"print"]) {
NSLog(@"Got a 'print' message from the web page");
[self printCurrentPage];
} else {
NSLog(@"Got a web page message other than 'print'");
}
}

如何让可打印的 iFrame 内容显示在 UIPrintInteractionController 而不是原始网页中?

最佳答案

我想出了一个解决办法。我正在使用 webView:decidePolicyForNavigationAction:decisionHandler:检测 iFrame。然后我使用 iFrame 的 NSURLRequest获取网页为 NSData ,然后我将其传递给 UIMarkupTextPrintFormatter作为NSString .最后,该格式化程序被传递给 UIPrintInteractionController .哇。

这是工作代码:

-(void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler {
if (!navigationAction.targetFrame.isMainFrame) {
NSLog(@"Got an iFrame: %@", navigationAction.request.URL.absoluteString);
// Save this request so we can use it later for invoice printing
self.printRequest = navigationAction.request;
decisionHandler(WKNavigationActionPolicyAllow);
}
}

然后一旦网页调用window.print() ...

- (void)userContentController:(WKUserContentController *)userContentController didReceiveScriptMessage:(WKScriptMessage *)message {
if ([message.name isEqualToString:@"print"]) {
NSLog(@"Got a 'print' message from the web page");
[self GETWebDataWithRequest:self.printRequest];
} else {
NSLog(@"Got a web page message other than 'print'");
}
}

- (void)GETWebDataWithRequest:(NSURLRequest *)request {
NSURLSessionConfiguration *configuration = [NSURLSessionConfiguration defaultSessionConfiguration];
NSURLSession *session = [NSURLSession sessionWithConfiguration:configuration delegate:nil delegateQueue:nil];
NSURLSessionDataTask *getDataTask = [session dataTaskWithRequest:request completionHandler:^(NSData *data, NSURLResponse *response, NSError *error) {
if(!error) {
NSLog(@"Got web data for url: %@", request.URL);
dispatch_async(dispatch_get_main_queue(), ^{
[self printCurrentPageWithData:data];
});
} else {
NSLog(@"Web data error: %@", error);
}
}];

[getDataTask resume];
}

- (void)printCurrentPageWithData:(NSData *)webData {
NSString *htmlString = [[NSString alloc] initWithData:webData encoding:NSUTF8StringEncoding];
UIMarkupTextPrintFormatter *markupTextPrintFormatter = [[UIMarkupTextPrintFormatter alloc] initWithMarkupText:htmlString];
UIPrintInteractionController *printInteractionController = [UIPrintInteractionController sharedPrintController];
printInteractionController.printFormatter = markupTextPrintFormatter;

UIPrintInteractionCompletionHandler completionHandler = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
if (!completed) {
if (error) {
NSLog(@"Print failed: %@", error);
} else {
NSLog(@"Print cancelled");
}
}
};
}

关于ios - UIPrintInteractionController 始终显示当前 WKWebView 而不是 iFrame 内容,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/56383842/

27 4 0
Copyright 2021 - 2024 cfsdn All Rights Reserved 蜀ICP备2022000587号
广告合作:1813099741@qq.com 6ren.com