崩潰更新NSTextStorage字體

我UITextView響應時UIContentSizeCategoryDidChangeNotification應對動態字體的變化，我實現了下面的代碼：崩潰更新NSTextStorage字體

NSTextStorage * textStorage = [self textStorage]; 
[textStorage beginEditing]; 
[textStorage enumerateAttribute: NSFontAttributeName 
         inRange: NSMakeRange(0, [textStorage length]) 
         options: 0 
        usingBlock: ^(id value, NSRange range, BOOL * stop) { 
         UIFont *newFont = [UIFont fontWithDescriptor: [UIFontDescriptor preferredFixedFontDescriptorWithTextStyle: IDFontTextStyleFixed] size: 0.0f]; 

         if (newFont) { 
          [textStorage removeAttribute: NSFontAttributeName 
                range: range]; 
          [textStorage addAttribute: NSFontAttributeName 
               value: newFont 
               range: range]; 
         } 
        }]; 

[textStorage endEditing];

它總是崩潰的最後一行，[textStorage endEditing];。我已啓用異常斷點 ~~，但在調試窗格~~ 中沒有附加信息，請參閱下面的回溯。如果我刪除'beginEditing和endEditing，它會在removeAttribute行上崩潰。我在我的應用中使用了[UIFont fontWithDescriptor: [UIFontDescriptor preferredFixedFontDescriptorWithTextStyle: IDFontTextStyleFixed] size: 0.0f];，除了在UITextView之外，它在任何地方都可以使用。

任何人都看到出了什麼問題，我該如何解決它？

編輯：這裏的回溯：

(lldb) bt 
* thread #1, queue = 'com.apple.main-thread', stop reason = EXC_BAD_ACCESS (code=2, address=0x10f3c0060) 
    frame #0: 0x000000010c77f29d libobjc.A.dylib`realizeClass(objc_class*) + 145 
    frame #1: 0x000000010c783125 libobjc.A.dylib`lookUpImpOrForward + 127 
    frame #2: 0x000000010c792554 libobjc.A.dylib`_objc_msgSend_uncached + 68 
    frame #3: 0x0000000118d39ce7 UIFoundation`-[NSGlyphGenerator generateGlyphsForGlyphStorage:desiredNumberOfCharacters:glyphIndex:characterIndex:] + 251 
    frame #4: 0x0000000118d06d47 UIFoundation`-[NSLayoutManager(NSPrivate) _fillGlyphHoleForCharacterRange:startGlyphIndex:desiredNumberOfCharacters:] + 736 
    frame #5: 0x0000000118d091b0 UIFoundation`_NSFastFillAllGlyphHolesForCharacterRange + 726 
    frame #6: 0x0000000118d47f2e UIFoundation`-[NSLayoutManager glyphRangeForCharacterRange:actualCharacterRange:] + 64 
    frame #7: 0x0000000118d071af UIFoundation`-[NSLayoutManager(NSPrivate) _fillLayoutHoleForCharacterRange:desiredNumberOfLines:isSoft:] + 617 
    frame #8: 0x0000000118d08e9a UIFoundation`-[NSLayoutManager(NSPrivate) _fillLayoutHoleAtIndex:desiredNumberOfLines:] + 208 
    frame #9: 0x0000000118d0954a UIFoundation`-[NSLayoutManager(NSPrivate) _markSelfAsDirtyForBackgroundLayout:] + 325 
    frame #10: 0x0000000118d13d10 UIFoundation`-[NSLayoutManager(NSPrivate) _invalidateLayoutForExtendedCharacterRange:isSoft:invalidateUsage:] + 2212 
    frame #11: 0x0000000118d44743 UIFoundation`-[NSLayoutManager textStorage:edited:range:changeInLength:invalidatedRange:] + 226 
    frame #12: 0x0000000118d448f9 UIFoundation`-[NSLayoutManager processEditingForTextStorage:edited:range:changeInLength:invalidatedRange:] + 47 
    frame #13: 0x0000000118d6c216 UIFoundation`-[NSTextStorage _notifyEdited:range:changeInLength:invalidatedRange:] + 168 
    frame #14: 0x0000000118d6bd4c UIFoundation`-[NSTextStorage processEditing] + 372 
    frame #15: 0x0000000118d6b995 UIFoundation`-[NSTextStorage endEditing] + 83 
    * frame #16: 0x000000010bee435b MyApp`-[MyUITextView updateFonts](self=0x00007fc26208c000, _cmd="updateFonts") at MyUITextView.m:107

來源

2017-04-01 Koen

它與什麼崩潰？控制檯中沒有記錄？ –

什麼也沒有，但我剛剛添加了回溯。 – Koen

OK，我解決了這個問題。

我正在使用助手類來處理NSTextStorage，NSTextContainer和NSLayoutManager對象。當創建MyTextView時，我沒有堅持幫助對象（我只通過了textContainer到init的MyTextView）。我現在幫助對象MyTextView@property，所以它有一個很強的參考，並且崩潰消失了。

來源

2017-04-01 19:25:41 Koen

崩潰更新NSTextStorage字體

回答

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