[UITextView] How to count Lines of Text

Counting Lines of Text

1.Counting hard line breaks

    NSString *string;
    unsigned numberOfLines, index, stringLength = [string length];
    for (index = 0, numberOfLines = 0; index < stringLength; numberOfLines++){
        index = NSMaxRange([string lineRangeForRange:NSMakeRange(index, 0)]);
    }

2.Counting lines of wrapped text

    NSLayoutManager *layoutManager = [textView layoutManager];
    unsigned numberOfLines, index, numberOfGlyphs = [layoutManager numberOfGlyphs];
    NSRange lineRange;
    for (numberOfLines = 0, index = 0; index < numberOfGlyphs; numberOfLines++){
        (void) [layoutManager lineFragmentRectForGlyphAtIndex:index
                                               effectiveRange:&lineRange];
        index = NSMaxRange(lineRange);
    }

Reference:
https://developer.apple.com/library/mac/documentation/Cocoa/Conceptual/TextLayout/TextLayout.pdf