Rendering PDF in UIWebView iOS 8, causes a black border around PDF(在 UIWebView iOS 8 中渲染 PDF，导致 PDF 周围出现黑色边框)

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问题描述

In iOS 8, when rendering a .PDF into a UIWebview there is a black border and background around the PDF displayed (not the whole background view). Note this is not the UIWebview background which is set to:

myWebView.opaque = NO;
myWebView.backgroundColor = [UIColor clearColor];

This is not present in < iOS8, (no black bordering coloured background around the .PDF)

Anyone else experienced this who could shed some light on this?

Im loading my PDF into the Web view like so..

- (void)viewWillAppear:(BOOL)animated
{

    [super viewWillAppear:animated];
    if (self.pdfData != nil && self.viewHasUnloaded == YES) {
        self.viewHasUnloaded = NO;
        [self.webView loadData:self.pdfData MIMEType:@"application/pdf" textEncodingName:@"utf-8" baseURL:nil];
    }
}

解决方案

Turn off WebKitDiskImageCacheEnabled and the black border goes away:

In applicationDidFinishLaunchingWithOptions add the following lines:

[[NSUserDefaults standardUserDefaults] setBool:NO forKey:@"WebKitDiskImageCacheEnabled"];
[[NSUserDefaults standardUserDefaults] synchronize];

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