iOS用SegmentController来切换tableView的时候 reloadData会造成数据重复创建 解决办法

把在Cell上面创建的控件放在Cell==nil的判断里面，这样，每次进来就会先判断有没有，就可以避免数据重复创建，导致视图越盖越厚

if (cell==nil) {

            cell=[[UITableViewCellalloc]initWithStyle:UITableViewCellStyleDefaultreuseIdentifier:cellIDD];

            self.inviteLabel=[[UILabelalloc]initWithFrame:CGRectMake(10,5,[UIScreenmainScreen].bounds.size.width-20,120)];

           self.inviteLabel.numberOfLines=0;

           self.inviteLabel.text=cell_info.title;

           self.inviteLabel.textColor=LABEL_TEXTCOLOR;

           int width=100;

           int height=40;

           self.button=[[UIButtonalloc]initWithFrame:CGRectMake([UIScreenmainScreen].bounds.size.width/2-width/2,120+10, width, height)];

            self.button.backgroundColor=[UIColorredColor];

            [self.buttonsetBackgroundImage:[UIImageimageNamed:cell_info.cp]forState:UIControlStateNormal];

           NSLog(@"cell_info.cp:%@",cell_info.cp);

           //增加长按手势

            UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizeralloc]initWithTarget:selfaction:@selector(longPress:)];

            [self.inviteLabeladdGestureRecognizer:longPress];

            longPress.minimumPressDuration=1.0;

            [cell.contentViewaddSubview:self.button];

            [cell.contentViewaddSubview:self.inviteLabel];

            cell.backgroundColor=CELL_BACK_COLOR;

        }