使用 Cocoa 打印本地 HTML
我有一个需要使用 Cocoa 打印的简单项目列表。我有一个不成熟的解决方案，它使用带有自定义 drawRect: 方法的 NSView，但它相当复杂并且不太容易维护。
我想要的是一个 HTML 字符串（可以很容易地从列表中构造），它可以嵌入一次性 WebView 中，然后打印。
假设我有一个简单的 NSString，例如：
NSString *htmlString = @"<b>Test</b>";
创建显示此内容的 WebView 的最简单方法是什么？我已经尝试过以下代码，但它会导致一个空白页：
WebView *webView = [[WebView alloc] init];
NSString *dir = @"/Users/Me/Desktop/";
NSString *fileUrl = [dir stringByAppendingPathComponent:@"Temp_Print.html"];
NSString *htmlString = @"<b>Hi!</b>";
[[htmlString dataUsingEncoding:NSUTF8StringEncoding] writeToFile:fileUrl atomically:YES];
[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:fileUrl]]];
[webView setFrame:NSMakeRect(0, 0, 500, 500)];
NSPrintOperation *po = [NSPrintOperation printOperationWithView:webView printInfo:pi];
[pi release];
[po runOperation];
I have a simple list of items that needs to be printed using Cocoa. I have a half-baked solution that uses an NSView with a custom drawRect: method, but it's fairly complex and not very easy to maintain.
What I would like to have is an HTML string (which could be easily constructed from the list) that can be embedded in a one-off WebView, then printed.
Assuming I have a simple NSString like:
NSString *htmlString = @"<b>Test</b>";
What's the easiest method for creating a WebView displaying this content? I've tried the below code, but it results in a single blank page:
WebView *webView = [[WebView alloc] init];
NSString *dir = @"/Users/Me/Desktop/";
NSString *fileUrl = [dir stringByAppendingPathComponent:@"Temp_Print.html"];
NSString *htmlString = @"<b>Hi!</b>";
[[htmlString dataUsingEncoding:NSUTF8StringEncoding] writeToFile:fileUrl atomically:YES];
[[webView mainFrame] loadRequest:[NSURLRequest requestWithURL:[NSURL fileURLWithPath:fileUrl]]];
[webView setFrame:NSMakeRect(0, 0, 500, 500)];
NSPrintOperation *po = [NSPrintOperation printOperationWithView:webView printInfo:pi];
[pi release];
[po runOperation];
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您提出后立即解决的另一个问题！
运行循环需要迭代才能实际加载内容。我只是在框架加载委托方法中完成了实际的打印操作：
来源
Another one of those questions you solve right after asking it!
The run loop needs to iterate in order for the content to actually load. I simply finished running the actual print operation in the frame load delegate method:
Source