打印纸张尺寸和内容插入

Question

我正在使用以下代码来打印包含文本和图像的HTML内容.

if (![UIPrintInteractionController isPrintingAvailable]) {
    UIAlertView *alertView = [[[UIAlertView alloc] 
        initWithTitle:NSLocalizedString(@"Printer Availability Error Title", @"")
        message:NSLocalizedString(@"Printer Availability Error Message", @"")
        delegate:nil
        cancelButtonTitle:NSLocalizedString(@"OK", @"OK")
        otherButtonTitles:nil] autorelease];
    [alertView show];
    return;
}

UIPrintInteractionController *pic = 
    [UIPrintInteractionController sharedPrintController];

if(!pic) {
    NSLog(@"Couldn't get shared UIPrintInteractionController!");
    return;
}

pic.delegate = self;

UIPrintInfo *printInfo = [UIPrintInfo printInfo];
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = @"Sample";
pic.printInfo = printInfo;

NSString *htmlString = [self prepareHTMLText];
UIMarkupTextPrintFormatter *htmlFormatter = 
    [[UIMarkupTextPrintFormatter alloc] initWithMarkupText:htmlString];
htmlFormatter.startPage = 0;
// 1-inch margins on all sides
htmlFormatter.contentInsets = UIEdgeInsetsMake(72.0, 72.0, 72.0, 72.0); 
// printed content should be 6-inches wide within those margins
htmlFormatter.maximumContentWidth = 6 * 72.0;   
pic.printFormatter = htmlFormatter;
[htmlFormatter release];

pic.showsPageRange = YES;

void (^completionHandler)(UIPrintInteractionController *, BOOL, NSError *) =
^(UIPrintInteractionController *printController, BOOL completed, NSError *error) {

    if (!completed && error) {
        NSLog(@"Printing could not complete because of error: %@", error);
    }
};

if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
    [pic presentFromBarButtonItem:self.myPrintBarButton 
        animated:YES 
        completionHandler:completionHandler];

} else {
    [pic presentAnimated:YES completionHandler:completionHandler];
}

请参阅附件中的结果(按比例缩小的版本可能不是很清楚,但希望你能得到图片).

这是我的问题:

1. 如何通过AirPrint确定打印纸尺寸？如果我想专门为A4纸格式化和打印数据怎么办？

2. 使用上述代码并使用不同的模拟打印机(打印机模拟器)打印的结果是,在所有情况下,我在第一页的顶部获得1英寸的边距,但在连续页面上没有.为什么？

3. 使用上述代码并使用不同的模拟打印机(打印机模拟器)进行打印的结果是,在某些情况下,字体样式会丢失.结果,内容向下移动.为什么？

Answer 1

1. 要专门选择A4纸张尺寸,我实施了协议的printInteractionController:choosePaper:方法,<UIPrintInteractionControllerDelegate>如果打印机支持,则返回A4纸张尺寸(测试时使用[UIPrintPaper bestPaperForPageSize:withPapersFromArray:].请注意,此处未设置纵向/横向,而是按UIPrintInfo属性设置orientation.

2. htmlFormatter.contentInsets在页面渲染器将页面拆分为页面之前,该属性仅设置整个内容的插入.通过a添加空白页眉和页脚UIPrintPageRenderer,然后在HTML打印格式化程序的左侧和右侧添加1cm边距,我能够设置每页1cm的页边距:

   UIPrintPageRenderer *renderer = [[UIPrintPageRenderer alloc] init];
   renderer.headerHeight = 30.0f;
   renderer.footerHeight = 30.0f;
   pic.printPageRenderer = renderer;
   [renderer release];
   
   UIMarkupTextPrintFormatter *htmlFormatter = [[UIMarkupTextPrintFormatter alloc] initWithMarkupText: htmlString];
   htmlFormatter.startPage = 0;
   htmlFormatter.contentInsets = UIEdgeInsetsMake(0.0f, 30.0f, 0.0f, 30.0f);
   [renderer addPrintFormatter: htmlFormatter startingAtPageAtIndex: 0];
   [htmlFormatter release];
   

3. 不禁对这一个抱歉.