UITableviewcell中的複選框隨着表格滾動消失

Question

我正在嘗試在每個可在選定和未選中切換的uitableviewcell中創建一個複選框。爲了確保單個選擇在加載新單元格時不會回收，我創建了一個可變的字符串數組來表示「取消選中」或「檢查」（即，當按鈕圖像應該顯示爲未選中或被選中時）。當按下檢查按鈕時，字符串將被替換爲「檢查」或「取消選中」。出於某種原因，我無法看到，當tableview滾動並且選中的檢查按鈕的單元格離開屏幕時，數組將丟失對其所做的更改，因此檢查字符串將丟失。

任何想法有什麼不對？

在此先感謝您的幫助。

就在第一個單元格按鈕在「checkButtonClicked」檢查後selectedCheckArray的NSLog的： {檢查，取消選中，取消選中，取消選中，取消選中，取消選中，取消選中}

selectedCheckArray的的NSLog後，我向下滾動，從而即第一小區不再在屏幕上： {取消選中，取消選中，取消選中，取消選中，取消選中，取消選中，取消選中}

下面的代碼：

.H

@property (strong, nonatomic) NSMutableArray *selectedCheckArray; 

.M

@synthesize selectedCheckArray; 

...

- (void)viewWillAppear:(BOOL)animated 
    { 
     // cellDataArray loaded here 

     selectedCheckArray = [[NSMutableArray alloc] init]; 

     for (int i = 0; i<[cellDataArray count]; i++) { 
      [selectedCheckArray addObject:@"Uncheck"]; 
     } 

     [super viewWillAppear:animated]; 
    } 


    - (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section 
    { 
     return [cellDataArray count]; 
    } 

    - (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath 
    { 
     static NSString *CellIdentifier = @"choiceCell"; 

     UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; 
     if (cell == nil) { 
      cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; 
     } 

     UIButton *checkButton = (UIButton *)[cell viewWithTag:1]; 

     if ([[selectedCheckArray objectAtIndex:indexPath.row] isEqualToString:@"Uncheck"])   { 
      [checkButton setImage:[UIImage imageNamed:@"unchecked"] 
       forState:UIControlStateNormal]; 
     } else { 
      [checkButton setImage:[UIImage imageNamed:@"checked"] 
       forState:UIControlStateNormal]; 
     } 
     [checkButton addTarget:self action:@selector(checkButtonClicked:) 
      forControlEvents:UIControlEventTouchUpInside]; 

     return cell; 
    } 

...

- (void)checkButtonClicked:(id)sender 
    { 
     // indexPath of cell of clicked button 
     CGPoint touchPoint = [sender convertPoint:CGPointZero toView:choiceTable]; 
     NSIndexPath *indexPath = [choiceTable indexPathForRowAtPoint:touchPoint]; 

     // Not using tag as sender will keep reference of clicked button 
     UIButton *button = (UIButton *)sender; 

     //Checking the condition button is checked or unchecked. 
     //accordingly replace the array object and change the button image 
     if([[selectedCheckArray objectAtIndex:indexPath.row] isEqualToString:@"Uncheck"]) 
     { 
      [button setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateNormal]; 
      [selectedCheckArray replaceObjectAtIndex:indexPath.row withObject:@"Check"]; 
     } else { 
      [button setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal]; 
      [selectedCheckArray replaceObjectAtIndex:indexPath.row withObject:@"Uncheck"]; 
     } 
    } 

Answer 1

試試這個，

在h文件，

NSMutableArray *arrayCellChecked; 

@property(nonatomic, retain) NSIndexPath *lastIndexPath; 

在.m文件

@synthesize lastIndexPath; 
int oldRow, newRow; 

在DidLoad方法，

arrayCellChecked = [[NSMutableArray alloc] init]; 

錶行的方法，

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath { 

     //Your Code 
     ---------- 

     newRow = [indexPath row]; 
     oldRow = [[self lastIndexPath] row]; 


     cell.accessibilityViewIsModal = (newRow == oldRow && lastIndexPath != nil) ? NO : YES; 

     if(cell.accessibilityViewIsModal == YES) 
      [checkButton setImage:[UIImage imageNamed:@"unchecked"] forState:UIControlStateNormal]; 
     else 
      [checkButton setImage:[UIImage imageNamed:@"checked"] forState:UIControlStateNormal]; 

     //Your Method for Button Click 
     ----------- 

     return cell; 
} 

表小區選擇方法，

- (void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath { 

    //Your Cell Code 
    ------- 

    if (cell.accessibilityViewIsModal == NO) { 

     cell.imgCheck.image = [UIImage imageNamed:@"checked"]; 
     cell.accessibilityViewIsModal = YES; 

     NSString *cellValue = yourArray.object; 

     [arrayCellChecked addObject:cellValue]; 

     ------- 
    } 

    else{ 

     cell.imgCheck.image = [UIImage imageNamed:@"unchecked"]; 
     cell.accessibilityViewIsModal = NO; 

     NSString *cellValue = yourArray.object; 

     [arrayCellChecked removeObject:cellValue]; 

     -------- 
    } 
} 

它會爲'didSelectRowAtIndex'完成。無需點擊按鈕方法。

我用這種方法解決了它。

希望它會爲你工作。 謝謝。