Question

我的应用程序使用我自己的NSTextStorage子类，一切正常，直到Mavericks。即使使用最精简的版本，我也会在使用它初始化文本视图时获得异常。我阅读了文档并查看了How to extend NSTextStorage?。希望你们中的一个人知道Apple是否有所改变，或者我是否做错了什么。

您可能需要帮助我：

例外：

TextViewCheck [12542：303]：例外***   NSRunStorage（0x6000000a4200），_ replaceElements（）：替换范围{0,929}扩展   超出当前运行存储大小928.在排版布局管理器中引发    NSLayoutManager：0x100106a80
  1个容器，文本备份有928个字符   选定字符范围{0,0}亲和力：上游粒度：字符   标记字符范围{0,0}   目前持有928个字形。
  字形树内容：928个字符，928个字形，1个节点，64个节点字节，960   存储字节，1024个字节，每个字符1.10个字节，每个字形1.10个字节   布局树内容：928个字符，928个字形，0个字形，0个行   片段，1个节点，64个节点字节，0个存储字节，64个总字节，0.07个字节   每个字符，每个字形0.07个字节，每个放置行片段0.00个字符，   每个放置的行片段0.00个字节   ，字形范围{0 928}。忽略...

回溯

thread #1: tid = 0x137013, 0x00007fff8ad7e44e AppKit`_NSGlyphTreeGetGlyphsInRange + 1179, queue = 'com.apple.main-thread, stop reason = EXC_BAD_ACCESS (code=1, address=0x1002c0000)

frame #0: 0x00007fff8ad7e44e AppKit`_NSGlyphTreeGetGlyphsInRange + 1179
frame #1: 0x00007fff8ad7dfa1 AppKit`-[NSLayoutManager getGlyphsInRange:glyphs:characterIndexes:glyphInscriptions:elasticBits:bidiLevels:] + 92
frame #2: 0x00007fff8ad4d8b6 AppKit`-[NSATSGlyphStorage setGlyphRange:characterRange:] + 3724
frame #3: 0x00007fff8ad4c8be AppKit`-[NSATSTypesetter _ctTypesetter] + 306
frame #4: 0x00007fff8ad4baf9 AppKit`-[NSATSLineFragment layoutForStartingGlyphAtIndex:characterIndex:minPosition:maxPosition:lineFragmentRect:] + 85
frame #5: 0x00007fff8ad4a64e AppKit`-[NSATSTypesetter _layoutLineFragmentStartingWithGlyphAtIndex:characterIndex:atPoint:renderingContext:] + 2777
frame #6: 0x00007fff8ad7dc79 AppKit`-[NSATSTypesetter layoutParagraphAtPoint:] + 149
frame #7: 0x00007fff8b3f5b45 AppKit`-[NSTypesetter _layoutGlyphsInLayoutManager:startingAtGlyphIndex:maxNumberOfLineFragments:maxCharacterIndex:nextGlyphIndex:nextCharacterIndex:] + 4043
frame #8: 0x00007fff8ad7cc9d AppKit`-[NSTypesetter layoutCharactersInRange:forLayoutManager:maximumNumberOfLineFragments:] + 202
frame #9: 0x00007fff8ad7cb81 AppKit`-[NSATSTypesetter layoutCharactersInRange:forLayoutManager:maximumNumberOfLineFragments:] + 1107
frame #10: 0x00007fff8ad7b219 AppKit`-[NSLayoutManager(NSPrivate) _fillLayoutHoleForCharacterRange:desiredNumberOfLines:isSoft:] + 1306
frame #11: 0x00007fff8ae24ad9 AppKit`_NSFastFillAllLayoutHolesForGlyphRange + 1435
frame #12: 0x00007fff8ae6ddbd AppKit`-[NSLayoutManager(NSPrivate) _firstPassGlyphRangeForBoundingRect:inTextContainer:okToFillHoles:] + 309
frame #13: 0x00007fff8ae6cea4 AppKit`-[NSLayoutManager(NSPrivate) _glyphRangeForBoundingRect:inTextContainer:fast:okToFillHoles:] + 875
frame #14: 0x00007fff8add81b2 AppKit`-[NSTextView setNeedsDisplayInRect:avoidAdditionalLayout:] + 1466
frame #15: 0x00007fff8acb4222 AppKit`-[NSView setNeedsDisplay:] + 81
frame #16: 0x00007fff8add68d9 AppKit`-[NSTextView setTextContainer:] + 699
frame #17: 0x00007fff8add651a AppKit`-[NSTextContainer setTextView:] + 263
...

代码：

TTTSimpleTextStorage.m

@implementation TTTSimpleTextStorage

- (id)initWithAttributedString:(NSAttributedString *)attrStr {
    if (self = [super init]) {
        contents = attrStr ? [attrStr mutableCopy] :
        [[NSMutableAttributedString alloc] init];
    }
    return self;
}


- init {
    return [self initWithAttributedString:nil];
}

- (NSString *)string {
    return [contents string];
}

- (NSDictionary *)attributesAtIndex:(NSUInteger)location
                 effectiveRange:(NSRange *)range {
    return [contents attributesAtIndex:location effectiveRange:range];
}

- (void)replaceCharactersInRange:(NSRange)range withString:(NSString
                                                        *)str {
    NSInteger origLen = [self length];
    [contents replaceCharactersInRange:range withString:str];
    [self edited:NSTextStorageEditedCharacters range:range
          changeInLength:[self length] - origLen];
}

- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range {
    [contents setAttributes:attrs range:range];
    [self edited:NSTextStorageEditedCharacters range:range
       changeInLength:0];
}

@end

我如何使用

这是在MainWindowController - awakeFromNib中，窗口IBOutlet有一个NSView作为名为 container 的子视图和一个随机字符串 string1

nts1 = [[TTTSimpleTextStorage alloc] initWithString:string1];

NSLayoutManager* lm1 = [[NSLayoutManager alloc] init];
[nts1 addLayoutManager:lm1];

NSTextContainer* tc1 = [[NSTextContainer alloc] initWithContainerSize:NSMakeSize(400, 280)];
[lm1 addTextContainer:tc1];


tv1 = [[NSTextView alloc] initWithFrame:NSMakeRect(40, 20, 400, 280) textContainer:tc1];  // here it crashes

[self.container addSubview:tv1];
[self.window makeKeyAndOrderFront:nil];
[self.window makeFirstResponder:tv1];

Answer 1

在replaceCharactersInRange中，您将origLen设置为[self length]，然后通过用[self length]减去origLen来计算changeInLength，这是有效的：

NSInteger origLen = self.length;
// ...
changeInLength: origLen - self.length

我觉得你更想要：

changeInLength: self.length - str.length];

在Mavericks上继承NSTextStorage时与范围相关的异常

1 个答案: