CGFloat minHeight = MESSAGE_MIN_LINE_COUNT * self.messageLabel.font.lineHeight;

if (self.messageLabel) {

CGFloat maxHeight = MESSAGE_MAX_LINE_COUNT * self.messageLabel.font.lineHeight;

#ifdef __IPHONE_7_0

NSMutableParagraphStyle *paragraphStyle = [[NSMutableParagraphStyle alloc] init];

paragraphStyle.lineBreakMode = self.messageLabel.lineBreakMode;

NSDictionary *attributes = @{NSFontAttributeName:self.messageLabel.font,

NSParagraphStyleAttributeName: paragraphStyle.copy};

// NSString class method: boundingRectWithSize:options:attributes:context is

// available only on ios7.0 sdk.

CGRect rect = [self.titleLabel.text boundingRectWithSize:CGSizeMake(CONTAINER_WIDTH - CONTENT_PADDING_LEFT * 2, maxHeight)

options:NSStringDrawingUsesLineFragmentOrigin

attributes:attributes

context:nil];

return MAX(minHeight, ceil(rect.size.height));

#else

CGSize size = [self.message sizeWithFont:self.messageLabel.font

constrainedToSize:CGSizeMake(CONTAINER_WIDTH - CONTENT_PADDING_LEFT * 2, maxHeight)

lineBreakMode:self.messageLabel.lineBreakMode];

return MAX(minHeight, size.height);

#endif

}

return minHeight;