停止从原型单元格中的一个 UITextView 添加到另一个单元格的输入文本

Question

我有一个奇怪的问题，我无法深入了解。我有一个 UITableView，其中包含各种原型单元格，具体取决于存储在可变数组中的内容。它的工作原理是这样的：

    if([currentHandout.content[indexPath.row - 3] isKindOfClass: [objHandoutSubtitle class]]){
        cellId =@"CellHandoutSubtitle";
        cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];

        ..
    }
    else if([currentHandout.content[indexPath.row  - 3] isKindOfClass: [objHandoutParagraph class]]){
        cellId =@"CellHandoutGeneral";
        cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];

        ..
    }
    else if([currentHandout.content[indexPath.row  - 3] isKindOfClass: [objHandoutQuote class]]){
        cellId =@"CellHandoutQuote";
        cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];

        ..
    }
    else if([currentHandout.content[indexPath.row  - 3] isKindOfClass: [objHandoutSimpleQuestion class]]){
        cellId =@"CellHandoutSimpleQuestion";
        cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];

        UILabel *questionLabel = (UILabel *)[cell viewWithTag:1];
        questionLabel.text = questionText;

        UITextView *theTextView = (UITextView *)[cell viewWithTag:2];
        theTextView.tag = indexPath.row + 100;
            theTextView.delegate = self;

        ..
    }

问题是当我在 CellHandoutSimpleQuestion 单元格中向 UITextView 添加文本时，它会将用户输入重复到其下方的另一个单元格中，如下图所示，有人知道为什么吗？

Answer 1

发生这种情况是因为您正在重用单元格的 UITextView。为避免这种情况，您需要将 UITextView 的文本存储在模型的属性中，并将该文本设置在最后一位

...
else if([currentHandout.content[indexPath.row  - 3] isKindOfClass: [objHandoutSimpleQuestion class]]){
    cellId =@"CellHandoutSimpleQuestion";
    cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];

    UILabel *questionLabel = (UILabel *)[cell viewWithTag:1];
    questionLabel.text = questionText;

    UITextView *theTextView = (UITextView *)[cell viewWithTag:2];
    theTextView.tag = indexPath.row + 100;
        theTextView.delegate = self;
        the.TextView.text = yourModelForTheCell.textViewText;
    ..
}

如果您需要支持编辑，则必须在委托方法 textView:shouldChangeTextInRange:replacementText:

上为对应的模型对象更新属性

Answer 2

通常当您看到前一个单元格的剩余部分时，这是因为它正在被重复使用并且值没有被重置。如果我正确地遵循你的代码，它可能是这样的。

else if([currentHandout.content[indexPath.row  - 3] isKindOfClass: [objHandoutSimpleQuestion class]]){
        cellId =@"CellHandoutSimpleQuestion";
        cell = [tableView dequeueReusableCellWithIdentifier:cellId forIndexPath:indexPath];

        UILabel *questionLabel = (UILabel *)[cell viewWithTag:1];
        questionLabel.text = questionText;

        UITextView *theTextView = (UITextView *)[cell viewWithTag:2];
        theTextView.tag = indexPath.row + 100;
            theTextView.delegate = self;


        theTextView.text = @"";

        //or set text if there is text to set



        ..
    }

停止从原型单元格中的一个 UITextView 添加到另一个单元格的输入文本

Stop inputted text from one UITextView within a prototype cell adding to another

ios

objective-c

uitableview

xcode6

uitextview