iOS 应用程序在 UIGraphicsEndPDFContext() 崩溃
<p><p>我正在尝试从当前 View 创建 PDF。下面是我的代码。</p>
<pre><code>func createPdfFromView(saveToDocumentsWithFileName fileName: String) -> CGPDFDocument?
{
let pdfData = NSMutableData()
var pdfDoc: CGPDFDocument!
UIGraphicsBeginPDFContextToData(pdfData, self.view.bounds, nil)
UIGraphicsBeginPDFPage()
guard let pdfContext = UIGraphicsGetCurrentContext() else { return nil }
self.view.layer.render(in: pdfContext)
UIGraphicsEndPDFContext()
if let documentDirectories = NSSearchPathForDirectoriesInDomains(.documentDirectory, .userDomainMask, true).first {
let documentsFileName = documentDirectories + "/" + fileName
debugPrint(documentsFileName)
pdfData.write(toFile: documentsFileName, atomically: true)
let localUrl= "file://"+documentsFileName as CFString
let pdfDocumentRef = CFURLCreateWithFileSystemPath(nil, localUrl, CFURLPathStyle.cfurlposixPathStyle, false)
pdfDoc = CGPDFDocument(pdfDocumentRef!)
return pdfDoc
}
return nil
}
</code></pre>
<p>但我的应用程序经常崩溃
<code>UIGraphicsEndPDFContext()</code> 出现 EXC_BAD_ACCESS 错误。不知道为什么会这样。我是 Swift 新手。</p></p>
<br><hr><h1><strong>Best Answer-推荐答案</ strong></h1><br>
<p><p>对我来说,这发生在我也试图用 CGContextRelease 释放它之后:</p>
<pre><code>UIGraphicsEndPDFContext();
CGContextRelease(pdfContext);//<-comment out this to solve
</code></pre>
<p>我只需要 <code>UIGraphicsEndPDFContext();</code>
由于某种原因,即使在调用 EndPDFContext 之后调用 CGContextRelease,仍然会导致 <code>EndPDFContext</code> 行出现 EXC_BAD_ACCESS,这可能是一个异步问题。</p></p>
<p style="font-size: 20px;">关于iOS 应用程序在 UIGraphicsEndPDFContext() 崩溃,我们在Stack Overflow上找到一个类似的问题:
<a href="https://stackoverflow.com/questions/45839827/" rel="noreferrer noopener nofollow" style="color: red;">
https://stackoverflow.com/questions/45839827/
</a>
</p>
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