设置Cell选中的颜色

需要同时设置高亮与选中状态，先高亮后选择

- (void)setSelected:(BOOL)selected animated:(BOOL)animated {
    [super setSelected:selected animated:animated];
    // Configure the view for the selected state
    
    if (selected) {
        self.contentView.backgroundColor = QBBackColor;
        
    }
}
- (void)setHighlighted:(BOOL)highlighted animated:(BOOL)animated {
    
    [super setHighlighted:highlighted animated:animated];
    if (highlighted) {
        self.contentView.backgroundColor = QBBackColor;
        
    }
}