ios - 使用 NSAttributedString 进行 AirPrint

Question

我正在尝试将两个 NSAttributedStrings 添加到一起。我希望它打印出来，以便标题具有与打印正文不同的字体大小和字体。这是我正在使用的代码。

-(IBAction)print:(id)sender{
    UIFont *font = [UIFont fontWithName:@"Avenir Next Condensed" size:16.0];
      NSDictionary *attrsDictionary = [NSDictionary dictionaryWithObject:font
                                                                  forKey:NSFontAttributeName];
      NSAttributedString *title = [[NSAttributedString alloc] initWithString:@"this is the title" attributes:attrsDictionary];


UIFont *font2 = [UIFont systemFontOfSize:14.0];

NSDictionary *attrsDictionary2 = [NSDictionary dictionaryWithObject:font2 forKey:NSFontAttributeName];  

      NSAttributedString *body = [[NSAttributedString alloc] initWithString:@"this is the body of the print" attributes:attrsDictionary2];

          NSMutableString *printBody = [NSMutableString stringWithFormat:[NSString stringWithFormat:@"%@ \n"
@"%@ \n",title,body]];

          UIPrintInteractionController *pic = [UIPrintInteractionController sharedPrintController];
          pic.delegate = self;


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


          UISimpleTextPrintFormatter *textFormatter = [[UISimpleTextPrintFormatter alloc] initWithText:printBody];
          textFormatter.startPage = 0;
          textFormatter.contentInsets = UIEdgeInsetsMake(72.0, 72.0, 72.0, 72.0);
          textFormatter.maximumContentWidth = 6 * 72.0;
          pic.printFormatter = textFormatter;
          pic.showsPageRange = YES;

          UIPrinter *SavedPrinterUserDefaults = [[NSUserDefaults standardUserDefaults]
                                                 objectForKey:@"SavedPrinter"];
          [pic printToPrinter:SavedPrinterUserDefaults
            completionHandler:^(UIPrintInteractionController *printInteractionController, BOOL completed, NSError *error) {
              if (completed && !error)
                NSLog(@"it printed!");
            }];

        }

当我打印这个时，打印机会打印一条看起来像这样的消息，它只是说所有的字体数据。

This is a test title{
NSFont = <font data>
}
this is the body of the print

如果有人能提供帮助那就太好了!

Answer 1

这一行:

NSMutableString *printBody = [NSMutableString stringWithFormat:[NSString stringWithFormat:@"%@ \n%@ \n",title,body]];

其实没什么意思。请记住，当您以字符串格式使用 %@ 时，放在那里的值来自调用相应对象的 description 方法。这不是组合两个属性字符串的正确方法。

因此，您需要修复的第一件事是组合两个属性字符串。你想要:

NSAttributedString *newline = [[NSAttributedString alloc] initWithString:@"\n"];
NSMutableAttributedString *printBody = [title mutableCopy];
[printBody appendAttributedString:newline];
[printBody appendAttributedString:body];
[printBody appendAttributedString:newline];

现在您已经有了想要打印的正确属性字符串，您需要更改创建打印格式化程序的方式。而不是:

UISimpleTextPrintFormatter *textFormatter = [[UISimpleTextPrintFormatter alloc] initWithText:printBody];

你想要:

UISimpleTextPrintFormatter *textFormatter = [[UISimpleTextPrintFormatter alloc] initWithAttributedText:printBody];