【发布时间】：2014-11-22 13:28:34
【问题描述】：
我正在尝试在 QuickLook 插件中显示 HTML。
GeneratePreviewForURL方法：
...
NSMutableString *html=[[NSMutableString alloc] init];
[html appendString:@"<html>"];
[html appendString:@"<body>"];
[html appendString:@"<h1>First Last</h1>"];
[html appendString:@"</body>"];
[html appendString:@"</html>"];
QLPreviewRequestSetDataRepresentation(
preview,
(__bridge CFDataRef)[html dataUsingEncoding:NSUTF8StringEncoding],
kUTTypePlainText,
NULL
);
...
预览窗口将 HTML 显示为纯文本：
<html><body><h1>First Last</h1></body></html>
但是，当我切换到 HTML 时：
...
NSDictionary *properties = @{
(__bridge NSString *)kQLPreviewPropertyTextEncodingNameKey : @"UTF-8",
(__bridge NSString *)kQLPreviewPropertyMIMETypeKey : @"text/html"
};
QLPreviewRequestSetDataRepresentation(
preview,
(__bridge CFDataRef)[html dataUsingEncoding:NSUTF8StringEncoding],
kUTTypeHTML,
(__bridge CFDictionaryRef)properties
);
...
** 编辑**
在调试模式下不显示预览窗口，但是，选择联系人（例如从 Spotlight 中）将显示预览。
** / 编辑 **
最终，我收到了警告（如下所列）。
我错过了什么？为什么预览版的工作方式与编译后的代码不同？
追踪：
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: conn 0x32807 token 0x1ffffffffffe85
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: Backtrace (at 118686):
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 0 CoreGraphics 0x00007fff913f9215 CGSBacktraceCreate + 59
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 1 CoreGraphics 0x00007fff91418688 _ZN16CGSUpdateManager14disable_updateEv + 84
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 2 AppKit 0x00007fff8738ede5 -[NSWindow disableScreenUpdatesUntilFlush] + 127
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 3 AppKit 0x00007fff878c394d -[NSVisualEffectView _createOrUpdateBackdrop:view:vibrancyEffect:] + 823
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 4 AppKit 0x00007fff878c466a -[NSVisualEffectView _updateCGSWindowBackdrop] + 70
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 5 AppKit 0x00007fff878c8294 -[NSVisualEffectView _update] + 147
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 6 AppKit 0x00007fff878c7fc1 -[NSVisualEffectView layout] + 59
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 7 AppKit 0x00007fff87370f54 -[NSView _layoutSubtreeWithOldSize:] + 373
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 8 AppKit 0x00007fff873711a5 -[NSView _layoutSubtreeWithOldSize:] + 966
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 9 AppKit 0x00007fff87364970 -[NSView layoutSubtreeIfNeeded] + 885
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 10 AppKit 0x00007fff879e0e7a _NSViewLayoutSubtreesThatUseAutolayoutIfNeeded + 71
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 11 AppKit 0x00007fff873c5b0f -[NSWindow(NSConstraintBasedLayout) _layoutViewTree] + 82
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 12 AppKit 0x00007fff873f5569 -[NSWindow(NSConstraintBasedLayout) layoutIfNeeded] + 244
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 13 AppKit 0x00007fff8743162e _handleWindowNeedsDisplayOrLayoutOrUpdateConstraints + 612
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 14 AppKit 0x00007fff879f6cf1 __83-[NSWindow _postWindowNeedsDisplayOrLayoutOrUpdateConstraintsUnlessPostingDisabled]_block_invoke1523 + 46
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 15 CoreFoundation 0x00007fff923acd87 __CFRUNLOOP_IS_CALLING_OUT_TO_AN_OBSERVER_CALLBACK_FUNCTION__ + 23
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 16 CoreFoundation 0x00007fff923acce0 __CFRunLoopDoObservers + 368
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 17 CoreFoundation 0x00007fff9239ede8 __CFRunLoopRun + 872
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 18 CoreFoundation 0x00007fff9239e838 CFRunLoopRunSpecific + 296
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 19 QuickLookUI 0x00007fff84d2b50b -[QLPreviewView _startTimeOut] + 189
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 20 QuickLookUI 0x00007fff84d0e1e1 -[QLPreviewPanelController _setCurrentPreviewItem:withTransition:blocking:] + 289
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 21 QuickLookUI 0x00007fff84d0d916 -[QLPreviewPanelController _refreshLayoutAndContentBlocking:] + 250
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 22 QuickLookUI 0x00007fff84d0efbc -[QLPreviewPanelController willOpen] + 734
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 23 QuickLookUI 0x00007fff84d0612c -[QLPreviewPanel _openWithEffect:willOpen:toFullscreen:] + 945
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 24 qlmanage 0x00000001000253b2 qlmanage + 152498
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 25 qlmanage 0x0000000100004a8f qlmanage + 19087
Nov 22 07:16:01 Pippin.local qlmanage[46393] <Warning>: void CGSUpdateManager::log() const: 26 libdyld.dylib 0x00007fff8d7ad5c9 start + 1
【问题讨论】：
标签： objective-c xcode xcode6 quicklook