Syntax highlighting with attributed strings on UITextView

Question

There is an excellent project to add syntax highlighting and line numbers to your project: https://github.com/illyabusigin/CYRTextView

But it has one critical issue described here: https://github.com/illyabusigin/CYRTextView/issues/16

The project is dead on github. Can anybody help to fix the issue? I've tried to analyze code but didn't find it yet.

Answer 1

The issue is described and fixed here: iOS 7.1 UITextView still not scrolling to cursor/caret after new line

#define SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(v) ([[[UIDevice currentDevice] systemVersion] compare:v options:NSNumericSearch] != NSOrderedAscending)
#define is_iOS7 SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"7.0")
#define is_iOS8 SYSTEM_VERSION_GREATER_THAN_OR_EQUAL_TO(@"8.0")
@implementation CYRTextView {
    ...old code...
    BOOL settingText;
}

- (id)initWithFrame:(CGRect)frame {
    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(handleTextViewDidChangeNotification:) name:UITextViewTextDidChangeNotification object:self];
}

- (void)scrollToCaretInTextView:(UITextView *)textView animated:(BOOL)animated {
    CGRect rect = [textView caretRectForPosition:textView.selectedTextRange.end];
    rect.size.height += textView.textContainerInset.bottom;
    [textView scrollRectToVisible:rect animated:animated];
}

- (void)handleTextViewDidChangeNotification:(NSNotification *)notification {
    if (notification.object == self && is_iOS7 && !is_iOS8 && !settingText) {
        UITextView *textView = self;
        if ([textView.text hasSuffix:@"\n"]) {
            [CATransaction setCompletionBlock:^{
                [self scrollToCaretInTextView:textView animated:NO];
            }];
        } else {
            [self scrollToCaretInTextView:textView animated:NO];
        }
    }
}

- (void)setText:(NSString *)text {
    settingText = YES;
    ...old code...
    settingText = NO;
}