iPad中的UIPrintInteractionController给了我两个警告 [英] UIPrintInteractionController in iPad is giving me two warnings

问题描述

我正在使用代码在我的应用中获取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：

I am using a code to get Airprint in my app to print the current view as an image. the Airprint dialog pops up but in the log screen it shows me two warnings :

1）警告：调用 - [UIPrintInteractionController presentAnimated：completionHandler： ]在iPad
上找不到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。

我已经在网上搜索但发现所有解决方案都提供了常规的rect按钮

I have already searched in the net but found that all solutions provided for regular rect Button

我在这里使用的是一个分段控件，在这种情况下我不知道如何使用这个控件

what I am using here is a segmented control, and I don't know how to use this control in this situation

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：

and this is the printItem method :

-(void)printItem {
CGRect rect = CGRectMake(0, 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！

any help will be great. Thanks in advance !

推荐答案

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

On iPad, you should use the popover API provided by the controller. It is mentioned in the documentation.

presentAnimated：completionHandler：

在一张工作表中显示iPhone打印用户界面，可以从屏幕底部向上滑动
动画。

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：

呈现iPad在弹出视图中打印用户界面，可以通过条形按钮项动画
。

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

presentFromRect：inView ：animated：completionHandler：

在弹出视图中显示iPad打印用户界面，
从视图中的任何区域进行动画处理。

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。

You should use the correct method on the corresponding device type.

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

您应该使用适当的参数进行弹出式演示。

You should use appropriate parameters for the popover presentation.

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