UITextField随机重用UITextField中的文本

问题描述

这是此问题的扩展：

我的表存在一些问题，该表的每个单元格中都有UITextFields。我注意到即使我似乎正确地保存了文本，文本仍在错误的单元格中被随机重用。

I'm having some issues with my table that has UITextFields in each cell. I notice text is still getting reused randomly in the wrong cells even though I seem to be saving it correctly.

 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"];
    }
}

推荐答案

您无法通过执行 textField == pulseTextField 进行检查，因为 UITableview 将以不可预测的方式重用单元格，只要重用标识符即可比赛。您正在存储对文本字段的引用，但是当您上下滚动时，该单元格可能会被分配一个不同的索引。因此，您可能最终会获得对同一文本字段的重复引用，因为某些单元格可能会在屏幕外出现过时的重复引用。

You cannot check by doing textField == pulseTextField, because UITableview will reuse cells in a unpredictable manner as long as the reuse identifiers match. You are storing a reference to a text field, but when you scroll up and down, that cell may get assigned a different index. So, you may end up with duplicate reference to the same text field, since some cells may be off-screen with outdated duplicate reference.

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