如何從單元格中刪除以前的內容

我使用搜索欄的tableview。我在單元格中顯示數據的數量。我正在用xib創建單元格。我還在單元格中添加了兩個按鈕。現在，當我在搜索欄中搜索任何內容時，表格正在重新加載，單元格按鈕在該地點再次添加。見下面的屏幕截圖： 1）第一次創建實現代碼如下：如何從單元格中刪除以前的內容

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2）搜索數據後：

![enter image description here][2]

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我對這段代碼：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 
WorkDetailCell *cell = [tableView dequeueReusableCellWithIdentifier:@"WorkDetailCell"]; 
if (cell == nil) { 
    NSArray *topLevelObject; 
    topLevelObject = [[NSBundle mainBundle] loadNibNamed:@"WorkDetailCell" owner:self options:nil]; 
    cell = [topLevelObject objectAtIndex:0]; 
    cell.backgroundColor=RGB(210, 200, 191); 
    cell.selectedBackgroundView=[self selectedCellView]; 
} 

if(search==FALSE){ 
    NSLog(@"%d",indexPath.row); 
    cell.clearsContextBeforeDrawing=YES; 
    //NSDictionary *detailList=[tempDataArray objectAtIndex:indexPath.row]; 
    NSArray *temp=[tempDataArray objectAtIndex:indexPath.row]; 
    cell.lblOrganization.text=[temp objectAtIndex:1];//@"TGB";//[detailList valueForKey:@"organizationName"]; 
    cell.lblAddress.text=[temp objectAtIndex:2];//@"Ahmedabad";//detailList[@"address"]; 
    cell.lblLandmark.text=[temp objectAtIndex:3];//@"SG HighWay";//detailList[@"landmark"]; 
    cell.lblCity.text=[temp objectAtIndex:4];//@"Ahmedabad";//detailList[@"city"]; 
    cell.lblState.text=[temp objectAtIndex:5];//@"Ahmedabad";//detailList[@"state"]; 


    UIButton *doneButton=[UIButton buttonWithType:UIButtonTypeCustom]; 
    doneButton.frame=CGRectMake(220, 45, 100, 60); 
    //[doneButton setTitle:@"pick" forState:UIControlStateNormal]; 
    [doneButton addTarget:self action:@selector(doneButtonClicked:) fo rControlEvents:UIControlEventTouchUpInside]; 
    [doneButton setImage:[UIImage imageNamed:@"pick"] forState:UIControlStateNormal]; 
    [doneButton setTag:indexPath.row]; 
    UIButton *previewButton=[UIButton buttonWithType:UIButtonTypeCustom]; 
    previewButton.frame=CGRectMake(235, 15, 65, 30); 
    [previewButton setTitle:@"Preview" forState:UIControlStateNormal]; 
    [previewButton setTitleColor:RGB(110, 73, 44) forState:UIControlStateNormal]; 
    [previewButton addTarget:self action:@selector(previewButtonClicked:) forControlEvents:UIControlEventTouchUpInside]; 
    [previewButton setTag:indexPath.row]; 
    [cell.contentView addSubview:doneButton]; 
    [cell.contentView addSubview:previewButton]; 
} 
else{ 
// NSDictionary *detailList=[searchResultArray objectAtIndex:indexPath.row]; 
    // NSLog(@"dic%@",detailList); 
    //cell.contentView.clearsContextBeforeDrawing=YES; 
    cell.clearsContextBeforeDrawing=YES; 
    NSArray *temp=[searchResultArray objectAtIndex:indexPath.row]; 
    cell.lblOrganization.text= [temp objectAtIndex:1]; //[detailList valueForKey:@"organizationName"]; 
    cell.lblAddress.text=[temp objectAtIndex:2];//detailList[@"address"]; 
    cell.lblLandmark.text=[temp objectAtIndex:3];//detailList[@"landmark"]; 
    cell.lblCity.text=[temp objectAtIndex:4];//detailList[@"city"]; 
    cell.lblState.text=[temp objectAtIndex:5];//detailList[@"state"]; 
    UIButton *doneButton=[UIButton buttonWithType:UIButtonTypeCustom]; 
    doneButton.frame=CGRectMake(220, 45, 100, 60); 
    //[doneButton setTitle:@"pick" forState:UIControlStateNormal]; 
    [doneButton addTarget:self action:@selector(doneButtonClicked:) fo rControlEvents:UIControlEventTouchUpInside]; 
    [doneButton setImage:[UIImage imageNamed:@"pick"] forState:UIControlStateNormal]; 
    [doneButton setTag:indexPath.row]; 
    UIButton *previewButton=[UIButton buttonWithType:UIButtonTypeCustom]; 
    previewButton.frame=CGRectMake(235, 15, 65, 30); 
    [previewButton setTitle:@"Preview" forState:UIControlStateNormal]; 
    [previewButton setTitleColor:RGB(110, 73, 44) forState:UIControlStateNormal]; 
    [previewButton addTarget:self action:@selector(previewButtonClicked:) forControlEvents:UIControlEventTouchUpInside]; 
    [previewButton setTag:indexPath.row]; 
    [cell.contentView addSubview:doneButton]; 
    [cell.contentView addSubview:previewButton]; 
    } 
    return cell;

來源

2013-12-16 jayesh

你必須要擺脫掉或插入重複代碼的可重用性if（這是這nil值：if (cell == nil) {

這裏的主要規則是創造一個細胞，你必須分開2種對象： - 對象獨一無二的每一個細胞（例如文本） - 的重複對象（主要是風格的對象，如顏色，背景陰影，按鈕和東西）

第一組應「如果」 (cell == nil)在外面可重用性。第二個應該在裏面。

你的情況：

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{ 
WorkDetailCell *cell = [tableView dequeueReusableCellWithIdentifier:@"WorkDetailCell"]; 
if (cell == nil) { 
    NSArray *topLevelObject; 
    topLevelObject = [[NSBundle mainBundle] loadNibNamed:@"WorkDetailCell" owner:self options:nil]; 
    cell = [topLevelObject objectAtIndex:0]; 
    cell.backgroundColor=RGB(210, 200, 191); 
    cell.selectedBackgroundView=[self selectedCellView]; 

    UIButton *doneButton=[UIButton buttonWithType:UIButtonTypeCustom]; 
    doneButton.frame=CGRectMake(220, 45, 100, 60); 
    //[doneButton setTitle:@"pick" forState:UIControlStateNormal]; 
    [doneButton addTarget:self action:@selector(doneButtonClicked:) fo rControlEvents:UIControlEventTouchUpInside]; 
    [doneButton setImage:[UIImage imageNamed:@"pick"] forState:UIControlStateNormal]; 
    [doneButton setTag:indexPath.row]; 
    UIButton *previewButton=[UIButton buttonWithType:UIButtonTypeCustom]; 
    previewButton.frame=CGRectMake(235, 15, 65, 30); 
    [previewButton setTitle:@"Preview" forState:UIControlStateNormal]; 
    [previewButton setTitleColor:RGB(110, 73, 44) forState:UIControlStateNormal]; 
    [previewButton addTarget:self action:@selector(previewButtonClicked:) forControlEvents:UIControlEventTouchUpInside]; 
    [cell.contentView addSubview:doneButton]; 
    [cell.contentView addSubview:previewButton]; 
} 

if(search==FALSE){ 
    NSLog(@"%d",indexPath.row); 
    cell.clearsContextBeforeDrawing=YES; 
    //NSDictionary *detailList=[tempDataArray objectAtIndex:indexPath.row]; 
    NSArray *temp=[tempDataArray objectAtIndex:indexPath.row]; 
    cell.lblOrganization.text=[temp objectAtIndex:1];//@"TGB";//[detailList valueForKey:@"organizationName"]; 
    cell.lblAddress.text=[temp objectAtIndex:2];//@"Ahmedabad";//detailList[@"address"]; 
    cell.lblLandmark.text=[temp objectAtIndex:3];//@"SG HighWay";//detailList[@"landmark"]; 
    cell.lblCity.text=[temp objectAtIndex:4];//@"Ahmedabad";//detailList[@"city"]; 
    cell.lblState.text=[temp objectAtIndex:5];//@"Ahmedabad";//detailList[@"state"]; 


    [previewButton setTag:indexPath.row]; 

} 
else{ 
// NSDictionary *detailList=[searchResultArray objectAtIndex:indexPath.row]; 
    // NSLog(@"dic%@",detailList); 
    //cell.contentView.clearsContextBeforeDrawing=YES; 
    cell.clearsContextBeforeDrawing=YES; 
    NSArray *temp=[searchResultArray objectAtIndex:indexPath.row]; 
    cell.lblOrganization.text= [temp objectAtIndex:1]; //[detailList valueForKey:@"organizationName"]; 
    cell.lblAddress.text=[temp objectAtIndex:2];//detailList[@"address"]; 
    cell.lblLandmark.text=[temp objectAtIndex:3];//detailList[@"landmark"]; 
    cell.lblCity.text=[temp objectAtIndex:4];//detailList[@"city"]; 
    cell.lblState.text=[temp objectAtIndex:5];//detailList[@"state"]; 

    [previewButton setTag:indexPath.row]; 
    } 
    return cell;

來源

2013-12-16 10:55:06 Kuba

確定我想要的是同樣的事情...謝謝you..and我得到你的觀點 – jayesh

-1

，當你重新加載tableview中，你將需要刪除它們在你的- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath{

添加爲子視圖這樣的按鈕只需調用[cell.contentView removeSubViews];

這應該有幫助

來源

2013-12-16 11:18:39 amrut1

什麼是可重用的點，如果他這樣做呢？ – Kuba

他的dosent需要可重用性，如果你明白它不是可重用的問題，他每次都會添加內容，因此你可以刪除那些不需要的東西，所以按鈕不會像圖片中那樣添加兩次 – amrut1

每個人都需要重用性！如果每次在滾動時都會出現可怕的滯後，那麼您的單元格就會變得多樣。每次都改變文字，重新繪製按鈕 - 不！ – Kuba

你的代碼有兩個問題：

您可以設置標籤爲doneButton和previewButton但代碼不會被使用。那麼標籤用於什麼？
當您滾動表格視圖時，表格視圖單元格將被重新使用。例如，如果單元格出現在索引0處，在索引10處重用，則作爲代碼，這些按鈕將再次添加。

所以，你可以爲所有的按鈕分別設置一個唯一的標籤，每一次- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath被調用時，你應該檢查一下按鈕已被添加，如果是的話，你應該避免再次添加按鈕。

您可以像下面添加代碼：

if (![cell viewWithTag:YOUR_BUTTON_TAG]) { 
     //create and add your button 
    }

來源

2013-12-16 11:33:44 youmingtaiz

如何從單元格中刪除以前的內容

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