Iphone UITextField随机重用UITextField中的文本

这是这个问题的延伸：

我的表在每个单元格中都有UITextFields，因此出现了一些问题。我注意到文本仍然在错误的单元格中被随机重复使用，尽管我似乎正确地保存了它

 else if (tableView == self.vitalsTableView)
    {
        if ([indexPath row] == 2) {
            CellIdentifier = @"bloodPressureCell";
            BloodPressureTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
            cell.textField1.text = [self.vitalsDictionary objectForKey:@"blood_pressure_1"];
            cell.textField2.text = [self.vitalsDictionary objectForKey:@"blood_pressure_2"];
            self.bloodPressureTextField1 = cell.textField1;
            self.bloodPressureTextField2 = cell.textField2;
            return cell;
        }
        else if ([indexPath row] == 9){
            CellIdentifier = @"statusCell";
            SmokingStatusTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
            return cell;
        }
        else if ([indexPath row] == 10){
            CellIdentifier = @"vitalsCell";
            UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
            return cell;
        }
        else{
            CellIdentifier = @"textCell";
            VitalsTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
            switch (indexPath.row) {
                case 0:
                    cell.vitalsLabel.text = @"Temperature";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"temperature"];
                    self.temperatureTextField = cell.textField;
                    break;
                case 1:
                    cell.vitalsLabel.text = @"Pulse";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"pulse"];
                    self.pulseTextField = cell.textField;
                    break;
                case 3:
                    cell.vitalsLabel.text = @"Respiratory Rate";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"respiratory_rate"];
                    self.respiratoryRateTextField = cell.textField;
                    break;
                case 4:
                    cell.vitalsLabel.text = @"Oxygen Saturation";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"oxygen_saturation"];
                    self.oxygenSaturationTextField = cell.textField;;
                    break;
                case 5:
                    cell.vitalsLabel.text = @"Height";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"height"];
                    self.heightTextField = cell.textField;
                    break;
                case 6:
                    cell.vitalsLabel.text = @"Weight";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"weight"];
                    self.weightTextField = cell.textField;
                    break;
                case 7:
                    cell.vitalsLabel.text = @"BMI";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"bmi"];
                    self.bmiTextField = cell.textField;
                    break;
                case 8:
                    cell.vitalsLabel.text = @"Pain (1-10)";
                    cell.textField.text = [self.vitalsDictionary objectForKey:@"pain"];
                    self.painTextField = cell.textField;
                    break;
                default:
                    break;
            }
            return cell;
        }

- (void) textFieldDidEndEditing:(UITextField *)textField{
    if (textField == temperatureTextField){
        [self.vitalsDictionary setObject:self.temperatureTextField.text forKey:@"temperature"];
    }
    else if (textField == pulseTextField){
        [self.vitalsDictionary setObject:self.pulseTextField.text forKey:@"pulse"];
    }
    else if (textField == respiratoryRateTextField){
        [self.vitalsDictionary setObject:self.respiratoryRateTextField.text forKey:@"respiratory_rate"];
    }
    else if (textField == oxygenSaturationTextField){
        [self.vitalsDictionary setObject:self.oxygenSaturationTextField.text forKey:@"oxygen_saturation"];
    }
    else if (textField == heightTextField){
        [self.vitalsDictionary setObject:self.heightTextField.text forKey:@"height"];
    }
    else if (textField == weightTextField){
        [self.vitalsDictionary setObject:self.weightTextField.text forKey:@"weight"];
    }
    else if (textField == bmiTextField){
        [self.vitalsDictionary setObject:self.bmiTextField.text forKey:@"bmi"];
    }
    else if (textField == painTextField){
        [self.vitalsDictionary setObject:self.painTextField.text forKey:@"pain"];
    }
    else if (textField == bloodPressureTextField1){
        [self.vitalsDictionary setObject:self.bloodPressureTextField1.text forKey:@"blood_pressure_1"];
    }
    else if (textField == bloodPressureTextField2){
        [self.vitalsDictionary setObject:self.bloodPressureTextField2.text forKey:@"blood_pressure_2"];
    }
}

---

不能通过执行textField==pulseTextField进行检查，因为只要重用标识符匹配，UITableview将以不可预测的方式重用单元格。您正在存储对文本字段的引用，但当您上下滚动时，该单元格可能会被分配一个不同的索引。因此，您可能最终会重复引用同一文本字段，因为某些单元格可能会在屏幕外使用过时的重复引用。

除了@Barum关于如何访问文本字段的正确答案外，您在创建单元格时也会遇到问题。您正在对缓存的单元格进行出列，但如果出列返回nil，我看不到您的代码创建新单元格。您需要执行以下操作：

else if (tableView == self.vitalsTableView) {
    if ([indexPath row] == 2) {
        CellIdentifier = @"bloodPressureCell";
        BloodPressureTableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
        if (cell == nil) {
            // create cell if nothing dequeued
            cell = [[BloodPressureTableViewCell alloc] init...]; // use an appropriate initializer
            cell.textField1.tag = MyTextFieldTagBloodPressure1;
            cell.textField2.tag = MyTextFieldTagBloodPressure2; 
        }
        // configure the cell
        cell.textField1.text = [self.vitalsDictionary objectForKey:@"blood_pressure_1"];
        cell.textField2.text = [self.vitalsDictionary objectForKey:@"blood_pressure_2"];
        return cell;
    }
    // do the same for all cell types

---

注意：上面的示例假设您为标记值定义了一个枚举。我建议这样做，因为这样可以使代码更具可读性，而且您不必记住哪个整数是哪个字段类型。

一个选项是利用标签，一个UIView属性。这样，UITextField将附加一个标记，以便您可以识别它的用途。请注意，标记只是NSInteger，所以您可能应该首先声明一些常量。这听起来很完美，您能帮我解决这个问题吗，因为我以前从未使用过常量？我有11个单元格，如示例代码所示。我在思考，而不是设置self.temperatureTextField=cell.textField；，会执行self.temperatureTextField.tag=1或其他操作吗similar@Barum如果正确，则应使用标记访问文本字段。使用cell.textField.tag=1；创建单元格时。确保对单元格中可能的每种类型的文本字段使用唯一的整数。在textfielddidediting中：使用if textField.tag==tag\u值检查特定类型的textField。我看到了另一个问题，我将在单独的答案中提出。