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=[[UITableViewCell
alloc]initWithStyle:UITableViewCellStyleDefault
reuseIdentifier:cellIDD];

self.inviteLabel=[[UILabel
alloc]initWithFrame:CGRectMake(10,5,[UIScreen
mainScreen].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=[[UIButton
alloc]initWithFrame:CGRectMake([UIScreen
mainScreen].bounds.size.width/2-width/2,120+10,
width, height)];

self.button.backgroundColor=[UIColor
redColor];

[self.button
setBackgroundImage:[UIImage
imageNamed:cell_info.cp]
forState:UIControlStateNormal];

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

//增加长按手势

UILongPressGestureRecognizer *longPress=[[UILongPressGestureRecognizer
alloc]initWithTarget:self
action:@selector(longPress:)];

[self.inviteLabel
addGestureRecognizer:longPress];

longPress.minimumPressDuration=1.0;

[cell.contentView
addSubview:self.button];

[cell.contentView
addSubview:self.inviteLabel];

cell.backgroundColor=CELL_BACK_COLOR;

}