问题描述
假设您有一个只有文本(即 UILabel)和一些黑线的简单 UIView.
Say you have a simple UIView with only text (ie, UILabel) and maybe some black lines.
这正是打印 UIView 的方法...
Here's exactly how you can print that UIView...
将其渲染为 UIImage,然后打印...
render it as a UIImage, and print that...
- (IBAction)printB:(id)sender
{
// we want to print a normal view ... some UILabels, maybe a black line
// in this technique, depressingly we CREATE AN IMAGE of the view...
// step 1. make a UIImage, of the whole view.
UIGraphicsBeginImageContextWithOptions(self.printMe.bounds.size, NO, 0.0);
// [self.printMe.layer renderInContext:UIGraphicsGetCurrentContext()];
// UIImage *asAnImage = UIGraphicsGetImageFromCurrentImageContext();
// .... or, more futuristically.....
[self.printMe drawViewHierarchyInRect:self.printMe.bounds
afterScreenUpdates:NO];
UIImage *snapshotImage = UIGraphicsGetImageFromCurrentImageContext();
UIGraphicsEndImageContext();
// step 2. choose grayscale, etc
UIPrintInfo *info = [UIPrintInfo printInfo];
info.orientation = UIPrintInfoOrientationPortrait;
info.outputType = UIPrintInfoOutputGrayscale;
// step 3, print that UIImage
UIPrintInteractionController *pic =
[UIPrintInteractionController sharedPrintController];
pic.delegate = self;
//pic.printingItem = asAnImage;
pic.printingItem = snapshotImage;
pic.printInfo = info;
UIPrintInteractionCompletionHandler completionHandler =
^(UIPrintInteractionController *pic, BOOL completed, NSError *error)
{
if (error)
NSLog(@"failed... %@ %ld", error.domain, (long)error.code);
if (completed)
NSLog(@"completed yes");
else
NSLog(@"completed no");
};
[pic presentAnimated:YES completionHandler:completionHandler];
}
但这会给你带来糟糕的结果.这是一种可笑的印刷排版方式.它应该作为附言或其他东西发送.
But this gives you crap results. It's a ridiculous way to print typography. It should be being sent as postscript, or something.
在 iPad 屏幕上...
on iPad screen...
打印时..
请注意,当然,如果您使用视网膜 ipad 会好一点,但这不是重点.将文本信息、黑线打印为图像是荒谬的.
Note that, of course, if you use a retina ipad it's a bit better, but that's not the point. it's ridiculous to print text information, black lines, as an image.
现在,你认为你可以打印一个像这样的 UIView ......
Now, you'd think you could print a UIView something like this ...
pic.printFormatter = [someUIView viewPrintFormatter];
但无论如何我都无法让它发挥作用.
but I can't get that to work no matter what I try.
有人有这方面的东西吗?谢谢!
Does anyone have anything on this? Thanks!
PS - 请注意,在 iOS 中,我们最近从使用 renderInContext 更改为使用快照调用.这对这里的问题完全没有影响,干杯.
PS - note that in iOS, we've recently changed from using renderInContext to using the snapshot call. It makes absolutely no difference to the issue here, cheers.
推荐答案
As Apple Doc 状态,UIView 的 viewPrintFormatter 属性定义在 UIView 类别中,但它仅适用于以下类型的实例:UITextView、MKMapView 和 >UIWebView.
As Apple Doc states, viewPrintFormatter attribute of UIView is defined in a UIView category but it's available only for instances of type: UITextView, MKMapView and UIWebView.
所以你可以:
- 使用图层属性打印 UIView 并展平其所有内容
- 使用要打印的内容初始化 UIWebView 并赋予其 viewPrintFormatter 属性到 pageRenderer 并渲染每个页面
这篇关于打印 UIView,但不是通过渲染为位图图像的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!