Get amount of lines in UITextView without considering maximum lines, content size and etc.

TextViewLines.m

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

    return numberOfLines;
}