我的表视图的数据一次又一次重装？ [英] My Data in table view reloaded again and again?
本文介绍了我的表视图的数据一次又一次重装？的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
我正在从JSON服务器的响应，并表明对表视图数据，但是当我向下滚动数据将再次重新显示上重叠每个单元。谁能告诉我，为什么会这样呢？我的code是below`
self.title = @表数据; 如果（检查）
{
self.title = @第二页;
}
[自送出数据] deliveryCases = [[UITableView的页头] initWithFrame：方法CGRectMake（0,0，320，480）];
deliveryCases.backgroundColor =的UIColor clearColor]
deliveryCases.dataSource =自我;
deliveryCases.delegate =自我;
[self.view addSubview：deliveryCases]; myCaseName = [[NSArray的页头]初始化];
- （UITableViewCell的*）的tableView：（UITableView的*）的tableView的cellForRowAtIndexPath：（NSIndexPath *）indexPath
{ 静态的NSString * cellIdentifier = @CellIdentifier
* UITableViewCell的细胞= [deliveryCases dequeueReusableCellWithIdentifier：cellIdentifier]; //显示在表视图中的数据 D = [deliveryCaseArray objectAtIndex：indexPath.row]; 如果（细胞==零）
{
电池= [[UITableViewCell的页头] initWithStyle：UITableViewCellStyleDefault reuseIdentifier：cellIdentifier];
} myCaseName = d.caseName; *的UILabel = caseNameLbl [的UILabel页头] initWithFrame：方法CGRectMake（70，10，100，50）;
caseNameLbl.text = [的NSString stringWithFormat：@％@，myCaseName]
caseNameLbl.textColor =的UIColor blackColor]
UIFont * boldFontlblDate = [UIFont boldSystemFontOfSize：[UIFont systemFontSize]];
[caseNameLbl并入setfont：boldFontlblDate];
caseNameLbl.backgroundColor =的UIColor clearColor]
[cell.contentView addSubview：caseNameLbl]; *的UILabel = caseDateLbl [的UILabel页头] initWithFrame：方法CGRectMake（160，10，100，50）;
NSDateFormatter *格式化= [[NSDateFormatter的alloc]初始化];
formatter.dateFormat = @M / D / YYYY;
的NSString * dateString = [格式化stringFromDate：[NSDate的日期]];
d.date = dateString;
caseDateLbl.text = [的NSString stringWithFormat：@％@，dateString]
caseDateLbl.textColor =的UIColor blackColor]
UIFont * boldFontlblStatus = [UIFont boldSystemFontOfSize：[UIFont systemFontSize]];
[caseDateLbl并入setfont：boldFontlblStatus];
caseDateLbl.backgroundColor =的UIColor clearColor]
[cell.contentView addSubview：caseDateLbl]; *的UILabel = caseStatusLbl [的UILabel页头] initWithFrame：方法CGRectMake（250，10，100，50）;
caseStatusLbl.text = [的NSString stringWithFormat：@％@，d.status]
caseStatusLbl.textColor =的UIColor blackColor]
UIFont * boldFontlblTrack = [UIFont boldSystemFontOfSize：[UIFont systemFontSize]];
[caseStatusLbl并入setfont：boldFontlblTrack];
caseStatusLbl.backgroundColor =的UIColor clearColor]
[cell.contentView addSubview：caseStatusLbl]; [单元setUserInteractionEnabled：YES];
tableView.allowsSelection = YES; 返回细胞;} - （NSInteger的）numberOfSectionsInTableView：（UITableView的*）tableView3
{
返回1;
} - （NSInteger的）的tableView：（UITableView的*）的tableView numberOfRowsInSection：（NSInteger的）部分
{
返回deliveryCaseArray.count;
} - （CGFloat的）的tableView：（UITableView的*）的tableView heightForHeaderInSection：（NSInteger的）部分
{
返回20.0;
} - （UIView的*）的tableView：（UITableView的*）的tableView viewForHeaderInSection：（NSInteger的）部分
{ 的UIView * headerView = [[UIView的的alloc] initWithFrame：方法CGRectMake（0，0，350，10）]; *的UILabel = LBL1 [的UILabel页头] initWithFrame：方法CGRectMake（10，0，100，50）;
lbl1.text = @＃;
[headerView addSubview：LBL1]; *的UILabel LBL2 = [[的UILabel页头] initWithFrame：方法CGRectMake（70，0，100，50）;
lbl2.text = @案例＃;
[headerView addSubview：LBL2]; *的UILabel = lbl3 [的UILabel页头] initWithFrame：方法CGRectMake（160，0，100，50）;
lbl3.text = @日期;
[headerView addSubview：lbl3]; *的UILabel = lbl4 [的UILabel页头] initWithFrame：方法CGRectMake（220，0，100，50）;
lbl4.text = @状态类型;
[headerView addSubview：lbl4]; 返回headerView;} - （无效）送出数据
{
* NSUserDefaults的uidSave = [NSUserDefaults的standardUserDefaults]
的NSMutableDictionary *获取= [[的NSMutableDictionary的alloc]初始化];
[拿到的setObject：[uidSave valueForKey：@UID] forKey：@UID];
[拿到的setObject：@开放forKey：@型];
的NSLog（@字典数据是要拿到％@，获得）;
NSData的* jsonData = [NSJSONSerialization dataWithJSONObject：获取选项：kNilOptions错误：无];
* NSString的jsonInputString = [[NSString的页头] initWithData：jsonData编码：NSUTF8StringEncoding];
* NSString的后期= [[NSString的页头] initWithFormat：@R =％@，jsonInputString] NSURL * URL = [NSURL URLWithString：[的NSString stringWithFormat：@％@，caseTypeUrl]]; NSData的* POSTDATA = [交dataUsingEncoding：NSASCIIStringEncoding allowLossyConversion：YES];
* NSString的postLength = [的NSString stringWithFormat：@％吕氏春秋，（无符号长）POSTDATA长度]];
NSMutableURLRequest *请求= [NSMutableURLRequest requestWithURL：URL的CachePolicy：NSURLRequestReloadIgnoringCacheData timeoutInterval：120.0;
[要求setURL：URL]
[要求setHTTPMethod：@POST];
[申请的setValue：postLength forHTTPHeaderField：@内容长度];
[申请的setValue：@应用程序/ x-WWW的形式urlen codeDforHTTPHeaderField：@的Content-Type];
[要求setHTTPBody：POSTDATA]; NSError *错误;
NSURLResponse *响应;
NSData的* responseData = [NSURLConnection的sendSynchronousRequest：请求returningResponse：安培;响应错误：放大器;错误]
如果（responseData！=无）
{ jsonArray = [NSJSONSerialization JSONObjectWithData：responseData选项：kNilOptions错误：＆放大器;错误]
的NSLog（@价值观=======％@，JSONArray），其中;
} 如果（错误）
{
的NSLog（@错误％@，error.description）;
UIAlertView中* alertView = [[UIAlertView中页头] initWithTitle：@错误消息：@服务器没有响应委托：自我cancelButtonTitle：@取消otherButtonTitles：无，无]
[alertView秀]
}
//设置名称数组
deliveryCaseArray = [[NSMutableArray里的alloc]初始化]; //循环通过我们的JSON数组
的for（int i = 0; I＆LT; jsonArray.count;我++）
{
//创建对象
* NSString的DATE1 = [[jsonArray objectAtIndex：我] objectForKey：@日期];
* NSString的protracking2 = [[jsonArray objectAtIndex：我] objectForKey：@protracking];
* NSString的STATUS3 = [[jsonArray objectAtIndex：我] objectForKey：@状态]; [deliveryCaseArray ADDOBJECT：[数据对象页头] initWithDate：日期1 andCaseName：protracking2和STATUS：STATUS3]]; } [deliveryCases reloadData];}
`
解决方案
您正在对细胞的内容查看每次加子视图。只有当你的细胞是零，你应该添加子视图。修改此法
- （UITableViewCell的*）的tableView：（UITableView的*）的tableView的cellForRowAtIndexPath：（NSIndexPath *）indexPath
{ 静态的NSString * cellIdentifier = @CellIdentifier
* UITableViewCell的细胞= [deliveryCases dequeueReusableCellWithIdentifier：cellIdentifier];//显示在表视图中的数据 D = [deliveryCaseArray objectAtIndex：indexPath.row];
myCaseName = d.caseName;
如果（细胞==零）
{
电池= [[UITableViewCell的页头] initWithStyle：UITableViewCellStyleDefault reuseIdentifier：cellIdentifier]; *的UILabel = caseNameLbl [的UILabel页头] initWithFrame：方法CGRectMake（70，10，100，50）;
caseNameLbl.text = [的NSString stringWithFormat：@％@，myCaseName]
caseNameLbl.textColor =的UIColor blackColor]
UIFont * boldFontlblDate = [UIFont boldSystemFontOfSize：[UIFont systemFontSize]];
[caseNameLbl并入setfont：boldFontlblDate];
caseNameLbl.backgroundColor =的UIColor clearColor]
[cell.contentView addSubview：caseNameLbl]; *的UILabel = caseDateLbl [的UILabel页头] initWithFrame：方法CGRectMake（160，10，100，50）;
NSDateFormatter *格式化= [[NSDateFormatter的alloc]初始化];
formatter.dateFormat = @M / D / YYYY;
的NSString * dateString = [格式化stringFromDate：[NSDate的日期]];
d.date = dateString;
caseDateLbl.text = [的NSString stringWithFormat：@％@，dateString]
caseDateLbl.textColor =的UIColor blackColor]
UIFont * boldFontlblStatus = [UIFont boldSystemFontOfSize：[UIFont systemFontSize]];
[caseDateLbl并入setfont：boldFontlblStatus];
caseDateLbl.backgroundColor =的UIColor clearColor]
[cell.contentView addSubview：caseDateLbl]; *的UILabel = caseStatusLbl [的UILabel页头] initWithFrame：方法CGRectMake（250，10，100，50）;
caseStatusLbl.text = [的NSString stringWithFormat：@％@，d.status]
caseStatusLbl.textColor =的UIColor blackColor]
UIFont * boldFontlblTrack = [UIFont boldSystemFontOfSize：[UIFont systemFontSize]];
[caseStatusLbl并入setfont：boldFontlblTrack];
caseStatusLbl.backgroundColor =的UIColor clearColor]
[cell.contentView addSubview：caseStatusLbl];
}
[单元setUserInteractionEnabled：YES];
tableView.allowsSelection = YES;
返回细胞;
}
I am getting the response from json server and show that data on table view but when i scroll down the data will show again again overlaps on each cell. Anyone can tell me why this happening?My Code is below`
self.title=@"Table Data";
if(check)
{
self.title = @"Second Page";
}
[self sendData];
deliveryCases = [[UITableView alloc]initWithFrame:CGRectMake(0,0, 320, 480)];
deliveryCases.backgroundColor = [UIColor clearColor];
deliveryCases.dataSource = self;
deliveryCases.delegate = self;
[self.view addSubview:deliveryCases];
myCaseName = [[NSArray alloc]init];
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = @"CellIdentifier";
UITableViewCell *cell = [deliveryCases dequeueReusableCellWithIdentifier:cellIdentifier];
// Showing data in table view
d = [deliveryCaseArray objectAtIndex:indexPath.row];
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
}
myCaseName = d.caseName;
UILabel *caseNameLbl =[[UILabel alloc]initWithFrame:CGRectMake(70, 10, 100 ,50)];
caseNameLbl.text = [NSString stringWithFormat:@"%@",myCaseName];
caseNameLbl.textColor=[UIColor blackColor];
UIFont * boldFontlblDate = [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
[caseNameLbl setFont:boldFontlblDate];
caseNameLbl.backgroundColor =[UIColor clearColor];
[cell.contentView addSubview:caseNameLbl];
UILabel *caseDateLbl =[[UILabel alloc]initWithFrame:CGRectMake(160, 10, 100 ,50)];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"M/d/yyyy";
NSString *dateString =[formatter stringFromDate:[NSDate date]];
d.date = dateString;
caseDateLbl.text = [NSString stringWithFormat:@"%@", dateString];
caseDateLbl.textColor=[UIColor blackColor];
UIFont * boldFontlblStatus= [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
[caseDateLbl setFont:boldFontlblStatus];
caseDateLbl.backgroundColor =[UIColor clearColor];
[cell.contentView addSubview:caseDateLbl];
UILabel *caseStatusLbl =[[UILabel alloc]initWithFrame:CGRectMake(250, 10, 100 ,50)];
caseStatusLbl.text = [NSString stringWithFormat:@"%@", d.status];
caseStatusLbl.textColor=[UIColor blackColor];
UIFont * boldFontlblTrack= [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
[caseStatusLbl setFont:boldFontlblTrack];
caseStatusLbl.backgroundColor =[UIColor clearColor];
[cell.contentView addSubview:caseStatusLbl];
[cell setUserInteractionEnabled:YES];
tableView.allowsSelection=YES;
return cell;
}
-(NSInteger) numberOfSectionsInTableView:(UITableView *)tableView3
{
return 1;
}
-(NSInteger) tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section
{
return deliveryCaseArray.count;
}
-(CGFloat)tableView:(UITableView *)tableView heightForHeaderInSection:(NSInteger)section
{
return 20.0;
}
-(UIView*)tableView:(UITableView *)tableView viewForHeaderInSection:(NSInteger)section
{
UIView *headerView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, 350 , 10)];
UILabel *lbl1 = [[UILabel alloc] initWithFrame:CGRectMake(10, 0, 100 , 50)];
lbl1.text = @"#";
[headerView addSubview:lbl1];
UILabel *lbl2 = [[UILabel alloc] initWithFrame:CGRectMake(70, 0, 100, 50)];
lbl2.text = @"Case #";
[headerView addSubview:lbl2];
UILabel *lbl3 = [[UILabel alloc] initWithFrame:CGRectMake(160, 0, 100, 50)];
lbl3.text = @"Date";
[headerView addSubview:lbl3];
UILabel *lbl4 = [[UILabel alloc] initWithFrame:CGRectMake(220, 0, 100, 50)];
lbl4.text = @"Status Type";
[headerView addSubview:lbl4];
return headerView;
}
-(void)sendData
{
NSUserDefaults *uidSave = [NSUserDefaults standardUserDefaults];
NSMutableDictionary *get = [[NSMutableDictionary alloc]init];
[get setObject:[uidSave valueForKey:@"uid"]forKey:@"uid"];
[get setObject:@"open" forKey:@"type"];
NSLog(@"Dictionary Data which is to be get %@",get);
NSData* jsonData = [NSJSONSerialization dataWithJSONObject:get options:kNilOptions error:nil];
NSString *jsonInputString = [[NSString alloc] initWithData:jsonData encoding:NSUTF8StringEncoding];
NSString *post = [[NSString alloc]initWithFormat:@"r=%@",jsonInputString];
NSURL *url=[NSURL URLWithString:[NSString stringWithFormat:@"%@",caseTypeUrl]];
NSData *postData = [post dataUsingEncoding:NSASCIIStringEncoding allowLossyConversion:YES];
NSString *postLength = [NSString stringWithFormat:@"%lu", (unsigned long)[postData length]];
NSMutableURLRequest *request = [NSMutableURLRequest requestWithURL:url cachePolicy:NSURLRequestReloadIgnoringCacheData timeoutInterval:120.0];
[request setURL:url];
[request setHTTPMethod:@"POST"];
[request setValue:postLength forHTTPHeaderField:@"Content-Length"];
[request setValue:@"application/x-www-form-urlencoded" forHTTPHeaderField:@"Content-Type"];
[request setHTTPBody:postData];
NSError *error;
NSURLResponse *response;
NSData *responseData=[NSURLConnection sendSynchronousRequest:request returningResponse:&response error:&error];
if (responseData != nil)
{
jsonArray = [NSJSONSerialization JSONObjectWithData:responseData options:kNilOptions error:&error];
NSLog(@"Values =======%@",jsonArray);
}
if (error)
{
NSLog(@"error %@",error.description);
UIAlertView *alertView = [[UIAlertView alloc]initWithTitle:@"Error" message:@"Server not responding" delegate:self cancelButtonTitle:@"cancel" otherButtonTitles:nil, nil];
[alertView show];
}
// Set up names array
deliveryCaseArray = [[NSMutableArray alloc]init];
// Loop through our json Array
for (int i = 0 ; i <jsonArray.count; i++)
{
//create object
NSString *date1 = [[jsonArray objectAtIndex:i]objectForKey:@"date"];
NSString *protracking2 = [[jsonArray objectAtIndex:i]objectForKey:@"protracking"];
NSString *status3 = [[jsonArray objectAtIndex:i]objectForKey:@"status"];
[deliveryCaseArray addObject:[[DataObjects alloc]initWithDate:date1 andCaseName:protracking2 andStatus:status3]];
}
[deliveryCases reloadData];
}
`
解决方案
You are adding subview on cell's contentview each time. You should add subview only when your cell is nil. Modify this method
-(UITableViewCell*)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
static NSString *cellIdentifier = @"CellIdentifier";
UITableViewCell *cell = [deliveryCases dequeueReusableCellWithIdentifier:cellIdentifier];
// Showing data in table view
d = [deliveryCaseArray objectAtIndex:indexPath.row];
myCaseName = d.caseName;
if (cell == nil)
{
cell = [[UITableViewCell alloc]initWithStyle:UITableViewCellStyleDefault reuseIdentifier:cellIdentifier];
UILabel *caseNameLbl =[[UILabel alloc]initWithFrame:CGRectMake(70, 10, 100 ,50)];
caseNameLbl.text = [NSString stringWithFormat:@"%@",myCaseName];
caseNameLbl.textColor=[UIColor blackColor];
UIFont * boldFontlblDate = [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
[caseNameLbl setFont:boldFontlblDate];
caseNameLbl.backgroundColor =[UIColor clearColor];
[cell.contentView addSubview:caseNameLbl];
UILabel *caseDateLbl =[[UILabel alloc]initWithFrame:CGRectMake(160, 10, 100 ,50)];
NSDateFormatter *formatter = [[NSDateFormatter alloc] init];
formatter.dateFormat = @"M/d/yyyy";
NSString *dateString =[formatter stringFromDate:[NSDate date]];
d.date = dateString;
caseDateLbl.text = [NSString stringWithFormat:@"%@", dateString];
caseDateLbl.textColor=[UIColor blackColor];
UIFont * boldFontlblStatus= [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
[caseDateLbl setFont:boldFontlblStatus];
caseDateLbl.backgroundColor =[UIColor clearColor];
[cell.contentView addSubview:caseDateLbl];
UILabel *caseStatusLbl =[[UILabel alloc]initWithFrame:CGRectMake(250, 10, 100 ,50)];
caseStatusLbl.text = [NSString stringWithFormat:@"%@", d.status];
caseStatusLbl.textColor=[UIColor blackColor];
UIFont * boldFontlblTrack= [UIFont boldSystemFontOfSize:[UIFont systemFontSize]];
[caseStatusLbl setFont:boldFontlblTrack];
caseStatusLbl.backgroundColor =[UIColor clearColor];
[cell.contentView addSubview:caseStatusLbl];
}
[cell setUserInteractionEnabled:YES];
tableView.allowsSelection=YES;
return cell;
}
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