iOS 9 : UIPrintInteractionController presentation issue

我在这个极其奇怪的问题上苦苦挣扎了几天。这是用于初始化和呈现打印对话框的标准代码，在 iOS 9 之前它可以完美运行:

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


- (IBAction)printContentid)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并且无法关闭，在模态视图之外点击无效 - 应用程序变得无响应。

---

Best Answer-推荐答案

正在发生的事情是取消和打印按钮被模式窗口剪裁，让您停留在该 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，按钮应该会回到模式中。

关于iOS 9 : UIPrintInteractionController presentation issue，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/33690154/