objective-c - 如何知道打印操作是否被取消？

Question

我正在使用 (NSPrintOperation *)printOperationWithView:(NSView *)aView printInfo:(NSPrintInfo *)aPrintInfo 方法在我的 OS X 应用程序中打印视图。一切都按预期工作。当用户通过单击打印面板上的“取消”按钮取消打印操作时，有没有办法捕捉事件？我一直在这里搜索 Apple 的打印编程指南和网络，但到目前为止一无所获。有谁知道怎么做？

Answer 1

Solved it! I added a selector to print operation method to catch the event when the printPanelDidEnd: [printOp runOperationModalForWindow:myWindow delegate:self didRunSelector:@selector(printPanelDidEnd:returnCode:contextInfo:) contextInfo:nil];

and then:

- (void)printPanelDidEnd:(NSPrintPanel *)printPanel returnCode:(NSInteger)returnCode contextInfo:(void *)contextInfo { if (returnCode == NSCancelButton) { NSLog(@"Cancel button was selected"); } }