iPhone : Print all contents of a Scroll View

Question

我需要你的帮助。我已经阅读了苹果关于打印的文档，但是我很难理解如何打印 ScrollView 的所有内容。我知道到目前为止检查打印机是否可用

//-----------Check for printer-------------------
if ([UIPrintInteractionController isPrintingAvailable]) {
    UIBarButtonItem *barButton = [[UIBarButtonItem alloc] initWithBarButtonSystemItem:UIBarButtonSystemItemAction
                                                                               target:self 
                                                                               action:@selector(printWebView:)];

    [self.navigationItem setLeftBarButtonItem:barButton animated:NO];
    self.printButton = barButton;
}

如果有人能提供实际打印作业的代码，我将不胜感激。提前致谢...

Answer 1

抓取屏幕截图并打印

/* 抓取屏幕截图并打印*/

-(void)printItem {

UIGraphicsBeginImageContext(self.view.bounds.size);
[self.view.layer renderInContext:UIGraphicsGetCurrentContext()];
UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();


UIPrintInteractionController *printController = [UIPrintInteractionController sharedPrintController];

if(printController ) {

    printController.delegate = self;

    UIPrintInfo *printInfo = [UIPrintInfo printInfo];
    printInfo.outputType = UIPrintInfoOutputGeneral;
    printInfo.jobName = @"resultado";
    printInfo.duplex = UIPrintInfoDuplexLongEdge;
    printController.printInfo = printInfo;
    printController.showsPageRange = YES;
    printController.printingItem = newImage;

    void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) = ^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {
        if (!completed && error) {
            NSLog(@"FAILED! due to error in domain %@ with error code %u", error.domain, error.code);
        }
    };

    [printController presentAnimated:YES completionHandler:completionHandler];

}
}