如何通过ContentView访问和迭代.当单元格不可见时，请参见

Question

我正在使用uitaiteView中创建一个表单，当我使用for for（uiview *cell.contentview.subviews in Cell.contentview.subviews）收集表中的所有数据，即使它迭代了通过UitableView中的每个单元格，它无法在行中看到尚不可见的任何数据。如何访问此数据？

我尝试在徒劳地添加scrolltorowatIndexpath，希望它会加载可见行，但无济于事。

 for (int i=0; i < countArray.count; i++) { //count needs to be for the cells entire tableView
        NSIndexPath *indexPath = [NSIndexPath indexPathForRow: i inSection: 0]; //create NSIndexPath for each cell in section 0
        UITableViewCell *cell = [self.table cellForRowAtIndexPath:indexPath]; //iterating through each cell available in table
        NSLog(@"iterationing through cell "%i"",indexPath.row);
         [self.table scrollToRowAtIndexPath:indexPath atScrollPosition:UITableViewScrollPositionBottom animated:YES];
        NSLog(@"moving view to "%i"",indexPath.row);
        for (UIView *view in  cell.contentView.subviews){ //find views within cell.contentview
            if ([view isKindOfClass:[UITextField class]]){ // narrow those views down to anything with class UITextField
                UITextField* txtField = (UITextField *)view; // instantiate the UITextField
                if (txtField.tag == 201) { //find the tag of the instantiated UITextField
                    if (dataSwitch == 0) { //we are collecting data
                        [tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
                    }else if (dataSwitch == 1) { //we are distributing data
                        txtField.text = [tmpArray objectAtIndex:i];
                    }
                }
                else if (txtField.tag == 202) { //find the tag of the instantiated UITextField
                    if (dataSwitch == 0) { //we are collecting data
                        [tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
                    }else if (dataSwitch == 1) { //we are distributing data
                        txtField.text = [tmpArray objectAtIndex:i];
                    }
                }
                else if (txtField.tag == 203) { //find the tag of the instantiated UITextField
                    if (dataSwitch == 0) { //we are collecting data
                        [tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
                    }else if (dataSwitch == 1) { //we are distributing data
                        txtField.text = [tmpArray objectAtIndex:i];
                    }
                }
                else if (txtField.tag == 204) { //find the tag of the instantiated UITextField
                    if (dataSwitch == 0) { //we are collecting data
                        [tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
                    }else if (dataSwitch == 1) { //we are distributing data
                        txtField.text = [tmpArray objectAtIndex:i];
                    }
                }
                else if (txtField.tag == 205) { //find the tag of the instantiated UITextField
                    if (dataSwitch == 0) { //we are collecting data
                        [tmpArray addObject:[NSString stringWithFormat:@"%@",txtField.text]];
                    }else if (dataSwitch == 1) { //we are distributing data
                        txtField.text = [tmpArray objectAtIndex:i];
                    }
                }
                else {
                    NSLog(@"Data is being lost %@ with tag %i",[tmpArray objectAtIndex:i], txtField.tag);
                }
            }

            // End of isKindofClass
            if ([view isKindOfClass:[UIImageView class]]){ // narrow those views down to anything with class UIImage
                UIImageView* image = (UIImageView *)view; // instantiate the UIImage
                if (dataSwitch == 0) { //we are collecting data
                    [tmpArray addObject:image];
                    NSLog(@"collecting image data and storing in %i",i);
                }else if (dataSwitch == 1) { //we are distributing data
                    image = [tmpArray objectAtIndex:i];
                }
            }

            if ([view isKindOfClass:[UILabel class]]){ // narrow those views down to anything with class UILabel
                UILabel* label = (UILabel *)view; // instantiate the UILabel
                 if (label.tag == 301) { //find the tag of the instantiated UILabel
                     if (dataSwitch == 0) { //we are collecting data
                        [tmpLabelArray addObject:[NSString stringWithFormat:@"%@",label.text]];
                        NSLog(@"%@",[NSString stringWithFormat:@"%@",label.text]);
                    }
                }
            }

            if ([view isKindOfClass:[UISegmentedControl class]]){ // narrow those views down to anything with class UISegmentedControl
                UISegmentedControl* seg = (UISegmentedControl *)view; // instantiate the UISegmentedControl
                if (dataSwitch == 0) { //we are collecting data
                    [tmpArray addObject:[NSString stringWithFormat:@"%i",seg.selectedSegmentIndex]];

                }
            }
        } // End of Cell Sub View
    }// Counter Loop

对此的任何帮助将不胜感激。

谢谢尼克。

** 编辑 **

这是我最终做的

邓肯C是正确的，抓住这样的信息是不正确的。可以使TableView动画以使可重复使用的单元格中查看并收集数据，但看起来很混乱，这是一种更干净的方法。

-(void)textFieldDidEndEditing:(UITextField *)textField {
 if(textField.tag >= 0 && textField.tag <= 10) {
      CGPoint location = [self.table convertPoint:textField.frame.origin fromView:textField.superview];
        NSIndexPath *indexPath = [self.table indexPathForRowAtPoint:location]; //get the indexPath of the textField.
      NSString *str1  = [NSString stringWithFormat:@"%i",stack];
      NSString *str2  = [NSString stringWithFormat:@"%i",indexPath.row];
      NSString *str3  = [NSString stringWithFormat:@"%@",textField.text];
      NSMutableArray *cellAnswer = [[NSMutableArray alloc] initWithObjects:str1,str2,str3, nil];
    }
}

Answer 1

您对表观点的工作方式以及应该如何使用它们有概念上的误解。不存在的细胞不存在。表视图仅创建当前可见的细胞。当用户滚动时，从屏幕上滚出的单元格放入回收队列中，然后将新曝光的细胞重新使用。

单元格是视图对象，不应用于保存数据。当用户将数据输入到单元格中（将文本输入文本字段，更改开关或滑块的值等）时，您应该立即收集这些更改并将其保存到表视图显示的模型中。然后，如果单元格在屏幕外滚动并丢弃，您已经收集了其状态数据。