Objective c WKWebView(OS X)的打印内容
我正试图打印Objective c WKWebView(OS X)的打印内容,objective-c,macos,cocoa,webkit,wkwebview,Objective C,Macos,Cocoa,Webkit,Wkwebview,我正试图打印WkWebView的内容,但当打印面板出现时,打印预览为空 代码如下: - (void)viewDidLoad { [super viewDidLoad]; WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init]; _webView = [[WKWebView alloc] initWithFrame:self.webViewOutlet.frame configurati
WkWebView
的内容,但当打印面板出现时,打印预览为空
代码如下:
- (void)viewDidLoad {
[super viewDidLoad];
WKWebViewConfiguration *config = [[WKWebViewConfiguration alloc] init];
_webView = [[WKWebView alloc] initWithFrame:self.webViewOutlet.frame configuration:config];
[_webView loadRequest:[NSURLRequest requestWithURL:[NSURL URLWithString:@"https://www.google.com"]]];
[_webViewOutlet addSubview:_webView];
_webView.navigationDelegate = self;
}
我有一个用于WKWebView
的出口,因此我可以查看它是否已加载,并且我正在将print
调用放入didfishnavigation
委托方法,如下所示,以确保:
- (void)webView:(WKWebView *)webView didFinishNavigation:(WKNavigation *)navigation
{
[self.webView print:nil];
}
无论使用哪一页,打印预览始终是空白页。我还尝试了使用NSPrintOperation
s,结果是一样的——打印预览和保存的PDF都是空白页
你知道我做错了什么吗?是否有其他方法将
WKWebView
打印/转换为PDF?欢迎提出建议。谢谢。您可以使用viewPrintFormatter
打印WKWebView
的内容。
以下是示例代码:
if ([UIPrintInteractionController isPrintingAvailable])
{
UIPrintInfo *pi = [UIPrintInfo printInfo];
pi.outputType = UIPrintInfoOutputGeneral;
pi.jobName = @"Print";
pi.orientation = UIPrintInfoOrientationPortrait;
pi.duplex = UIPrintInfoDuplexLongEdge;
UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];
pic.printInfo = pi;
pic.showsPageRange = YES;
pic.printFormatter = self.webView.viewPrintFormatter;
[pic presentFromBarButtonItem:barButton animated:YES completionHandler:^(UIPrintInteractionController *printInteractionController, BOOL completed, NSError *error) {
if(error)
NSLog(@"handle error here");
else
NSLog(@"success");
}];
}
我使用的解决方案是实例化一个好的旧WebView对象,并使用该对象的print方法。我的示例使用html字符串作为起点,但它应该很容易适应URL 目标C
@interface WebPrinter ()
{
WebView *printView;
NSPrintInfo *printInfo;
}
@implementation WebPrinter
- (void)printHtml:(NSString *)html {
if (!printInfo) {
printInfo = [NSPrintInfo sharedPrintInfo];
printInfo.topMargin = 25;
printInfo.bottomMargin = 10;
printInfo.rightMargin = 10;
printInfo.leftMargin = 10;
}
NSRect printViewFrame = NSMakeRect(0, 0, printInfo.paperSize.width, printInfo.paperSize.height);
printView = [[WebView alloc] initWithFrame:printViewFrame frameName:@"printFrame" groupName:@"printGroup"];
printView.shouldUpdateWhileOffscreen = true;
printView.frameLoadDelegate = self;
[printView.mainFrame loadHTMLString:html baseURL:NSBundle.mainBundle.resourceURL];
}
- (void)webView:(WebView *)sender didFinishLoadForFrame:(WebFrame *)frame {
if (frame != sender.mainFrame) {
return;
}
if (sender.isLoading) {
return;
}
if ([[sender stringByEvaluatingJavaScriptFromString:@"document.readyState"] isEqualToString:@"complete"]) {
sender.frameLoadDelegate = nil;
NSWindow *window = NSApp.mainWindow;
if (!window) {
window = NSApp.windows.firstObject;
}
NSPrintOperation *printOperation = [NSPrintOperation printOperationWithView: frame.frameView.documentView printInfo:printInfo];
[printOperation runOperationModalForWindow:window delegate:window didRunSelector:nil contextInfo:nil];
}
}
@end
Swift
class WebPrinter: NSObject, WebFrameLoadDelegate {
let window: NSWindow
var printView: WebView?
let printInfo = NSPrintInfo.shared
init(window: NSWindow) {
self.window = window
printInfo.topMargin = 30
printInfo.bottomMargin = 15
printInfo.rightMargin = 0
printInfo.leftMargin = 0
}
func printHtml(_ html: String) {
let printViewFrame = NSMakeRect(0, 0, printInfo.paperSize.width, printInfo.paperSize.height)
if let printView = WebView(frame: printViewFrame, frameName: "printFrame", groupName: "printGroup") {
printView.shouldUpdateWhileOffscreen = true
printView.frameLoadDelegate = self
printView.mainFrame.loadHTMLString(html, baseURL: Bundle.main.resourceURL)
}
}
func webView(_ sender: WebView!, didFinishLoadFor frame: WebFrame!) {
if frame != sender.mainFrame {
return
}
if sender.isLoading {
return
}
if sender.stringByEvaluatingJavaScript(from: "document.readyState") == "complete" {
sender.frameLoadDelegate = nil
let printOperation = NSPrintOperation(view: frame.frameView.documentView, printInfo: printInfo)
printOperation.runModal(for: window, delegate: window, didRun: nil, contextInfo: nil)
}
}
}
如果您的应用程序可能需要macOS 10.13或更高版本,则WKWebView上有一个新方法:takeSnapshot(with:completionHandler:),该方法生成web视图的NSImage表示
据我所知,这是将WKWebView渲染为图像的最佳选项。UIPrintInteractionController在OSX上不可用。它仅在iOS上提供。请参阅,您的答案是swift而非客观CGood,谢谢。请考虑在未来的UnuteNoT中像我这样的无辜的Objc开发者,当使用这个示例代码时,你需要为<代码> DeD FixSimuly< <代码>保留类。有没有办法使用这种方法得到PDF(或者至少一个向量表示)?我不这么认为。