ios - UIView 的空中打印生成白页
<p><p>我有以下打印代码,我希望它打印该类所附加到的 ViewController 的 UIVIew,</p>
<p>但打印只会生成空白页(和两页而不是一页)</p>
<p>我是 xcode 的新手,你能帮忙找出错误吗?</p>
<pre><code>UIPrintInteractionController *pc = [UIPrintInteractionController
sharedPrintController];
UIPrintInfo *printInfo = ;
printInfo.outputType = UIPrintInfoOutputGeneral;
printInfo.jobName = @"Print file";
pc.printInfo = printInfo;
UIViewPrintFormatter *Pformatter = ;
pc.printFormatter = Pformatter;
UIPrintInteractionCompletionHandler completionHandler =
^(UIPrintInteractionController *printController, BOOL completed,
NSError *error) {
if(!completed && error){
NSLog(@"Print failed - domain: %@ error code %u", error.domain,
error.code);
}
};
if (UI_USER_INTERFACE_IDIOM() == UIUserInterfaceIdiomPad) {
[pc presentFromBarButtonItem:self.btnPrint animated:YES
completionHandler:completionHandler];
} else {
;
}
</code></pre></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>FWIW 这是从 iPad/iPhone 的任何 UIView 打印位图的完整工作代码</p>
<p><strong>注意,这只会打印位图。</strong></p>
<p>请注意,(奇怪的是)iOS 似乎不包括将 UIView 渲染到 postscript 的概念.. <a href="https://stackoverflow.com/questions/24479985" rel="noreferrer noopener nofollow">Print a UIView, but NOT by rendering as a bitmap image</a> </p>
<p>换句话说,以下内容在 iOS 中似乎还没有意义......</p>
<pre><code>UIViewPrintFormatter *f = ;
</code></pre>
<p>无论如何,以下内容将打印(仅作为位图)绝对任何 UIView...</p>
<p>您只需使用 <strong>renderInContext:</strong> 或,</p>
<p>对于更现代的代码,</p>
<p><strong>drawViewHierarchyInRect: 和 UIGraphicsGetImageFromCurrentImageContext() 的组合</strong></p>
<pre><code>- (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);
// ;
// 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 = ;
info.orientation = UIPrintInfoOrientationPortrait;
info.outputType = UIPrintInfoOutputGrayscale;
// step 3, print that UIImage
UIPrintInteractionController *pic =
;
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");
};
;
}
</code></pre>
<p>这真的很简单,幸运的是。但它是一个渲染的位图图像。</p></p>
<p style="font-size: 20px;">关于ios - UIView 的空中打印生成白页,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/19725033/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/19725033/
</a>
</p>
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