UIAlertController - objcmemo @ ウィキ

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    // シングル
    //_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/_/
    NSString *title = NSLocalizedString(@"TITLE", @"タイトル");
    NSString *message = NSLocalizedString(@"MESSAGE", @"メッセージ");
    NSString *cancelButtonTitle = NSLocalizedString(@"CANCEL", @"キャンセル");
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle
                                                           style:UIAlertActionStyleCancel
                                                         handler:nil];
    [alertController addAction:cancelAction];
    [self presentViewController:alertController animated:YES completion:nil];
 
   // 消去 
   [self dismissViewControllerAnimated:YES completion:nil];
 
 
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    // パスワード入力
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    typeof(self) __weak wself = self;
    NSString *title = NSLocalizedString(@"TITLE", @"タイトル");
    NSString *message = NSLocalizedString(@"MESSAGE", @"メッセージ");
    NSString *ok = NSLocalizedString(@"OK", @"OK");
    NSString *cancel = NSLocalizedString(@"CANCEL", @"キャンセル");
    UIAlertController* alert = [UIAlertController alertControllerWithTitle:title
                                                                   message:message
                                                            preferredStyle:UIAlertControllerStyleAlert];
    [alert addAction:[UIAlertAction actionWithTitle:cancel
                                              style:UIAlertActionStyleDefault handler:nil]];
    [alert addAction:[UIAlertAction actionWithTitle:ok
                                              style:UIAlertActionStyleDefault handler:^(UIAlertAction * _Nonnull action)
                      {
                          UITextField *textField = alert.textFields[0];
                          [wself.view endEditing:YES];
                          NSLog(@"%@", textField.text);
                          [textField resignFirstResponder];
                      }]];
    [alert addTextFieldWithConfigurationHandler:^(UITextField * _Nonnull textField) {
        textField.placeholder = @"パスワード";
        textField.keyboardType = UIKeyboardTypeNumberPad;
        textField.secureTextEntry = YES;
    }];
    [self presentViewController:alert animated:YES completion:nil];
 
 
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    // 複数選択（３以上）
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    NSString *title = NSLocalizedString(@"TITLE", @"タイトル");
    NSString *message = NSLocalizedString(@"MESSAGE", @"メッセージ");
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    NSString *otherButtonTitle1 = NSLocalizedString(@"BUTTON_1", @"ボタン１");
    UIAlertAction *otherButtonAction1 = [UIAlertAction actionWithTitle:otherButtonTitle1
                                                                 style:UIAlertActionStyleDefault
                                                               handler:^(UIAlertAction *action)
                                         {
                                             // ボタン１押下時の処理を行う
                                             NSLog(@"ボタン１押下時の処理を行う");
                                         }];
    NSString *otherButtonTitle2 = NSLocalizedString(@"BUTTON_2", @"ボタン２");
    UIAlertAction *otherButtonAction2 = [UIAlertAction actionWithTitle:otherButtonTitle2
                                                                 style:UIAlertActionStyleDefault
                                                               handler:^(UIAlertAction *action)
                                         {
                                             // ボタン２押下時の処理を行う
                                             NSLog(@"ボタン２押下時の処理を行う");
                                         }];
    NSString *otherButtonTitle3 = NSLocalizedString(@"BUTTON_3", @"ボタン３");
    UIAlertAction *otherButtonAction3 = [UIAlertAction actionWithTitle:otherButtonTitle3
                                                                 style:UIAlertActionStyleDefault
                                                               handler:^(UIAlertAction *action)
                                         {
                                             // ボタン３押下時の処理を行う
                                             NSLog(@"ボタン３押下時の処理を行う");
                                         }];
    NSString *cancelButtonTitle = NSLocalizedString(@"CANCEL", @"キャンセル");
    UIAlertAction *cancelAction = [UIAlertAction actionWithTitle:cancelButtonTitle
                                                           style:UIAlertActionStyleCancel
                                                         handler:nil];
    [alertController addAction:otherButtonAction1];
    [alertController addAction:otherButtonAction2];
    [alertController addAction:otherButtonAction3];
    [alertController addAction:cancelAction];
    [self presentViewController:alertController animated:YES completion:nil];
 
 
 
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    // 処理中
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    NSString *title = NSLocalizedString(@"", nil);
    NSString *message = NSLocalizedString(@"", nil);
    UIAlertController *alertController = [UIAlertController alertControllerWithTitle:title
                                                                             message:message
                                                                      preferredStyle:UIAlertControllerStyleAlert];
    [self presentViewController:alertController
                       animated:YES
                     completion:^()             // (void (^)(void))completion = ^()
     {
         UIActivityIndicatorView *indicator = UIActivityIndicatorView.new;
         indicator.center = CGPointMake(alertController.view.bounds.size.width/2,
                                        alertController.view.bounds.size.height/2);
         indicator.color = [UIColor blackColor];
 
         [indicator startAnimating];
         [alertController.view addSubview:indicator];
     }];