通過編程以動畫方式更改UISwitch的狀態

Question

我有一個UITableView，其中包含一些包含UISwitches的單元格：

UISwitch* actSwitch = (UISwitch*)[cell viewWithTag: SWITCH_TAG];
[actSwitch addTarget: self
              action: @selector(actSwitchChanged:) 
    forControlEvents: UIControlEventValueChanged];
BOOL value = [appSettings.lock_when_inactive boolValue];
[actSwitch setOn: value animated:NO];

而且我還想覆蓋didSelectRowAtIndexPath:方法來執行各個UISwitch的切換：

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

    NSString *cellType = [self typeOfCellForIndexPath:indexPath];
    if ( cellType  == @"CellWithSwitch" )
    {
        UISwitch* actSwitch = (UISwitch*)[[[self tableView] cellForRowAtIndexPath:indexPath ] viewWithTag: SWITCH_TAG];
        BOOL value = [actSwitch isOn];
        [actSwitch setOn:!value animated:YES]; // <-- HERE IS THE PROBLEM
        [self actSwitchChanged: actSwitch];
    }
    else if ( cellType == @"CellWithoutSwitch" )
    {
        // other actions
    }
}

在這兩種情況下，我都直接單擊UISwitch或單擊單元格，它會更改其狀態並正確調用actSwitchChanged:

但是，如果我單擊該單元格，我的UISwitch不會為從一種狀態切換到另一種狀態設置動畫，它只是在一瞬間更改其狀態。

因此[actSwitch setOn:!value animated:YES]不足以告訴perfom動畫嗎？

---

這是我設置和調用配置單元格的方法：

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

    UITableViewCell *cell = nil;
    NSString *EnabledCellIdentifier = [self typeOfCellForIndexPath:indexPath];  
    cell = [tableView dequeueReusableCellWithIdentifier:EnabledCellIdentifier];

    if (cell == nil) 
    {
        cell = [self cellForType:EnabledCellIdentifier];
    }
    [self cofigureCell:cell forIndexPath:indexPath];

    return cell;
}

這是我配置單元格的方式：

- (void)cofigureCell:(UITableViewCell*)cell forIndexPath:(NSIndexPath*)indexPath {
    switch ( indexPath.section )
    {
        case 0: 
            // not this
        case 1: 
        {
            switch ( indexPath.row )
            {
                case 0:
                {
                    cell.textLabel.text = @"Limit passwords attempts";
                    UISwitch* actSwitch = (UISwitch*)[cell viewWithTag: SWITCH_TAG];
                    [actSwitch addTarget: self
                                  action: @selector(actSwitchChanged:) 
                        forControlEvents: UIControlEventValueChanged];
                    BOOL value = [appSettings.limit_password_attempts boolValue];
                    [actSwitch setOn: value animated:NO];

                    break;
                }
                //other rows of this section here are being configured
            }
            break;
        }

        case 2: 
        {
            switch ( indexPath.row )
            {
                case 0:
                {
                    cell.textLabel.text = @"Lock when inactive";
                    UISwitch* actSwitch = (UISwitch*)[cell viewWithTag: SWITCH_TAG];
                    [actSwitch addTarget: self
                                  action: @selector(actSwitchChanged:) 
                        forControlEvents: UIControlEventValueChanged];
                    BOOL value = [appSettings.lock_when_inactive boolValue];
                    [actSwitch setOn: value animated:NO];

                    break;
                }
                //other rows of this section here are being configured
            }
            break;
        }
        default:

            break;
    }
}

但是，當我逐步調試並完成此步驟時：

[actSwitch setOn:!value animated:YES]; // <-- HERE IS THE PROBLEM

僅在[self actSwitchChanged: actSwitch];之后，actSwitch才更改其狀態[self actSwitchChanged: actSwitch]; 更改數據模型並調用[self.tableView reloadData];

可能是因為我有兩個帶有UISwitches的單元，並且它們之間存在一些沖突？ 可能有比我的代碼更好的方法來從單元中獲取UISwitch了：

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

    NSString *cellType = [self typeOfCellForIndexPath:indexPath];
    if ( cellType  == @"CellWithSwitch" )
    {
        UISwitch* actSwitch = (UISwitch*)[[[self tableView] cellForRowAtIndexPath:indexPath ] viewWithTag: SWITCH_TAG];
        BOOL value = [actSwitch isOn];
        [actSwitch setOn:!value animated:YES]; // <-- HERE IS THE PROBLEM
        [self actSwitchChanged: actSwitch];
    }
    else if ( cellType == @"CellWithoutSwitch" )
    {
        // other actions
    }
}

Answer 1

只需稍微延遲調用actSwitchChanged函數即可：

UISwitch* actSwitch = (UISwitch*)[[[self tableView] cellForRowAtIndexPath:indexPath ]  viewWithTag: SWITCH_TAG];
    BOOL value = [actSwitch isOn];
    [actSwitch setOn:!value animated:YES]; // <-- HERE IS THE PROBLEM
[self performSelector:@selector(actSwitchChanged:) withObject:actSwitch afterDelay:0.55];

Answer 2

SWIFT 4

使用委托協議創建一個UITableViewCell子類。 我添加了標題標簽和開關，如下所示：

protocol CellWithSwitchDelegate: class {
    func didToggleSwitch(on: Bool)
}

class CellWithSwitchTableViewCell: UITableViewCell {

    @IBOutlet weak var titleLabel: UILabel!
    @IBOutlet weak var toggleSwitch: UISwitch!
    weak var delegate: CellWithSwitchDelegate?

    override func awakeFromNib() {
        super.awakeFromNib()
    }

    override func setSelected(_ selected: Bool, animated: Bool) {
        super.setSelected(selected, animated: animated)
    }

    @IBAction func switchWasToggled(_ sender: UISwitch) {
        delegate?.didToggleSwitch(on: sender.isOn)
    }    

}

在您的UITableViewController中，添加委托方法，如下所示：

class UITableViewController: CellWithSwitchDelegate {

    func didToggleSwitch(on: Bool) {
        // This is the delegate function that's called when the switch is toggled
        print("toggled switch")
    }
}

在您的UITableViewController中，將以下內容添加到didSelectRowAtIndexPath中：

func tableView(_ tableView: UITableView, didSelectRowAt indexPath: IndexPath) {
    let cell = tableView.cellForRow(at: indexPath) as! CellWithSwitchTableViewCell
    let settingsSwitch = cell.toggleSwitch!
    didToggleSwitch(on: !settingsSwitch.isOn)
    settingsSwitch.setOn(!settingsSwitch.isOn, animated: true)
}