NSTextStorage语法降价

Question

我正在为iOS/osx编写一个语法标记。

它是NSTextStorage的一个子类。它在iOS中工作得很好，但在OSX中(在转换代码后，将UIColor转换为NSColor，将UIFont转换为NSFont)，它确实工作得很好。这只是在OSX中发生的，因为在IOS中它工作得很好。

有什么帮助吗？

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

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

- (void)replaceCharactersInRange:(NSRange)range withString:(NSString*)str {

    [self beginEditing];
    [_backingStore replaceCharactersInRange:range withString:str];
    [self edited:NSTextStorageEditedCharacters | NSTextStorageEditedAttributes range:range changeInLength:str.length - range.length];
    [self endEditing];

}

- (void)setAttributes:(NSDictionary *)attrs range:(NSRange)range {

    [self beginEditing];
    [_backingStore setAttributes:attrs range:range];
    [self edited:NSTextStorageEditedAttributes range:range changeInLength:0];
    [self endEditing];

}

- (void)processEditing {

    [self performReplacementsForRange:[self editedRange]];
    [super processEditing];
}

- (void)performReplacementsForRange:(NSRange)changedRange {

    NSString* backingString = [_backingStore string];
    NSRange extendedRange = extendedRange = NSUnionRange(changedRange, [backingString lineRangeForRange:NSMakeRange(NSMaxRange(changedRange), 0)]);
    [self applyStylesToRange:extendedRange];
}

- (void)applyStylesToRange:(NSRange)searchRange {

    NSDictionary* attributeDictionary = self.attributeDictionary;
    NSString* backingString = [_backingStore string];
    NSDictionary* bodyAttributes  = self.bodyAttributes;
    [self setAttributes:bodyAttributes range:searchRange];
    [attributeDictionary enumerateKeysAndObjectsUsingBlock:^(NSRegularExpression* regex, NSDictionary* attributes, BOOL* stop) {
        [regex enumerateMatchesInString:backingString options:0 range:searchRange
                             usingBlock:^(NSTextCheckingResult *match, NSMatchingFlags flags, BOOL *stop) {
                                 NSRange matchRange = [match rangeAtIndex:1];
                                 [self addAttributes:attributes range:matchRange];
                             }];
    }];

}

Answer 1

我不熟悉NSTextStorage，但是我通过重写fixAttributesInRange:而不是processEditing来解决这个问题。

而不是

- (void)processEditing {

    [self performReplacementsForRange:[self editedRange]];
    [super processEditing];
}

做

- (void)fixAttributesInRange:(NSRange)range {
    [self performReplacementsForRange:range];
    [super fixAttributesInRange:(NSRange)range];
}

顺便说一句：applyStylesToRange不应该嵌套在beginEditing和endEditing之间吗