iOS 9 : UIPrintInteractionController presentation issue

Question

我为这个极其奇怪的问题苦苦挣扎了几天。下面是用于初始化和显示打印对话框的标准代码，它在 iOS 9 之前完美运行:

- (void)setupPrinting:(UIPrintInteractionController *)aPrintController
{
    NSString *text = [self formattedHTMLforPrinting];
    UIMarkupTextPrintFormatter *formatter = [[[UIMarkupTextPrintFormatter alloc] initWithMarkupText:text] autorelease];
    aPrintController.printFormatter = formatter;
}


- (IBAction)printContent:(id)aSender {
    if ([UIPrintInteractionController isPrintingAvailable]) {
        UIPrintInteractionController *printController = [UIPrintInteractionController sharedPrintController];
        printController.delegate = self;
        [self setupPrinting:printController];

//tried different ways to present print controller
//        [printController presentAnimated:NO completionHandler:nil];
//        [printController presentFromRect:self.view.bounds inView:self.view animated:YES

//these two lines are just to make sure printButton is not nil
        self.printButton.layer.borderColor = [UIColor redColor].CGColor;
        self.printButton.layer.borderWidth = 1.0;

        [printController presentFromRect:self.printButton.bounds inView:self.printButton animated:YES
            completionHandler:^(UIPrintInteractionController *aPrintController, BOOL aCompleted, NSError *anError)
            {
              NSLog(@"printing is done with error: %@", anError);
            }];
    }
}

在 iOS 9 上，打印对话框显示错误且无法关闭在模态视图外点击没有效果 - 应用程序变得无响应。

Answer 1

发生的事情是模式窗口剪裁了取消和打印按钮，使您停留在该 View 中。如果有人遇到类似问题，请检查您是否在 UINavigationBar 类上设置了固定宽度。更新后，按钮应返回模式。