ios – iPad中的UIPrintInteractionController给了我两个警告

我正在使用代码在我的应用程序中获取Airprint以将当前视图打印为图像.
弹出Airprint对话框,但在日志屏幕中它显示两个警告：

1)警告：在iPad上调用 – [UIPrintInteractionController presentAnimated：completionHandler：]
找不到PDF标题：找不到`％PDF’.

2)[UIPopoverController_commonPresentPopoverFromrect：
inView：allowedArrowDirections：animated：]：传入此方法的rect必须具有非零的宽度和高度.这将是未来版本中的一个例外.

我已经在网上搜索过,但发现所有解决方案都提供了常规的rect按钮

我在这里使用的是一个分段控件,我不知道在这种情况下如何使用这个控件

这是段控制代码：

- (IBAction)legalSegment:(id)sender {


switch (((UISegmentedControl *)sender).selectedSegmentIndex) {
    case 0:
    {
        [self printItem];
        break;
    }
}

这是printItem方法：

-(void)printItem {
CGRect rect = CGRectMake(0,768,1004);
UIGraphicsBeginImageContext(rect.size);
CGContextRef context = UIGraphicsGetCurrentContext();
[self.view.layer renderInContext:context];
UIImage *img = UIGraphicsGetimageFromCurrentimageContext();
UIGraphicsEndImageContext();

UIPrintInteractionController* pic = [UIPrintInteractionController sharedPrintController];
NSData *imageData = [NSData dataWithData:UIImagePNGRepresentation(img)];
if (pic && [UIPrintInteractionController canPrintData:imageData])
{
    pic.delegate = self;
    uiprintinfo* printInfo = [uiprintinfo printInfo];
    printInfo.outputType = uiprintinfoOutputPhoto;
    printInfo.jobName = @"PrintingImage";
    printInfo.duplex = uiprintinfoDuplexLongEdge;
    pic.printInfo = printInfo;
    pic.showsPageRange = YES;
    pic.printingItem = imageData;

    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);
        }
    };

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

任何帮助都会很棒.
提前致谢 ！

解决方法

在iPad上,您应该使用控制器提供的popover API.它在文档中提到.

presentAnimated:completionHandler:

Presents the iPhone printing user interface in a sheet that can be
animated to slide up from the bottom of the screen.

presentFromBarButtonItem:animated:completionHandler:

Presents the iPad printing user interface in a popover view that can
be animated from a bar-button item.

presentFromrect:inView:animated:completionHandler:

Presents the iPad printing user interface in a popover view that can
be animated from any area in a view.

您应该在相应的设备类型上使用正确的方法.

if([UIDevice currentDevice].userInterfaceIdiom == UIUserInterfaceIdiomPad) {
    [pic presentFromrect:self.view.frame inView:self.view animated:YES completionHandler:completionHandler];
}
else {
    [pic presentAnimated:YES completionHandler:completionHandler];
}

您应该为弹出窗口演示使用适当的参数.