Cell高亮时设置cell内容

重写setHighlighted方法

-(void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated
{
    [super setHighlighted:highlighted animated:animated];
    
    if (highlighted)
    {
        self.chatImage.image = [[UIImage imageNamed:@"M_RHL"] stretchableImageWithLeftCapWidth:10 topCapHeight:30];
    }else
    {
        if (self.shouldH)
        {
            self.chatImage.image = [[UIImage imageNamed:@"M_R"] stretchableImageWithLeftCapWidth:10 topCapHeight:30];
        }
    }
}