react-native/React/CoreModules/RCTAlertManager.mm

/*
 * Copyright (c) Facebook, Inc. and its affiliates.
 *
 * This source code is licensed under the MIT license found in the
 * LICENSE file in the root directory of this source tree.
 */

#import "RCTAlertManager.h"

#import <FBReactNativeSpec/FBReactNativeSpec.h>
#import <RCTTypeSafety/RCTConvertHelpers.h>
#import <React/RCTAssert.h>
#import <React/RCTConvert.h>
#import <React/RCTLog.h>
#import <React/RCTUIManager.h>
#import <React/RCTUtils.h>

#import "CoreModulesPlugins.h"

@implementation RCTConvert (UIAlertViewStyle)

RCT_ENUM_CONVERTER(RCTAlertViewStyle, (@{
  @"default": @(RCTAlertViewStyleDefault),
  @"secure-text": @(RCTAlertViewStyleSecureTextInput),
  @"plain-text": @(RCTAlertViewStylePlainTextInput),
  @"login-password": @(RCTAlertViewStyleLoginAndPasswordInput),
}), RCTAlertViewStyleDefault, integerValue)

@end

@interface RCTAlertManager() <NativeAlertManagerSpec>

@end

@implementation RCTAlertManager
{
  NSHashTable *_alertControllers;
}

@synthesize bridge = _bridge;

RCT_EXPORT_MODULE()

- (dispatch_queue_t)methodQueue
{
  return dispatch_get_main_queue();
}

- (void)invalidate
{
  for (UIAlertController *alertController in _alertControllers) {
    [alertController.presentingViewController dismissViewControllerAnimated:YES completion:nil];
  }
}

/**
 * @param {NSDictionary} args Dictionary of the form
 *
 *   @{
 *     @"message": @"<Alert message>",
 *     @"buttons": @[
 *       @{@"<key1>": @"<title1>"},
 *       @{@"<key2>": @"<title2>"},
 *     ],
 *     @"cancelButtonKey": @"<key2>",
 *   }
 * The key from the `buttons` dictionary is passed back in the callback on click.
 * Buttons are displayed in the order they are specified.
 */
RCT_EXPORT_METHOD(alertWithArgs:(JS::NativeAlertManager::Args &)args
                  callback:(RCTResponseSenderBlock)callback)
{
  NSString *title = [RCTConvert NSString:args.title()];
  NSString *message = [RCTConvert NSString:args.message()];
  RCTAlertViewStyle type = [RCTConvert RCTAlertViewStyle:args.type()];
  NSArray<NSDictionary *> *buttons = [RCTConvert NSDictionaryArray:RCTConvertOptionalVecToArray(args.buttons(), ^id(id<NSObject> element) { return element; })];
  NSString *defaultValue = [RCTConvert NSString:args.defaultValue()];
  NSString *cancelButtonKey = [RCTConvert NSString:args.cancelButtonKey()];
  NSString *destructiveButtonKey = [RCTConvert NSString:args.destructiveButtonKey()];
  UIKeyboardType keyboardType = [RCTConvert UIKeyboardType:args.keyboardType()];
  NSNumber *reactTag = [RCTConvert NSNumber:args.reactTag() ? @(*args.reactTag()) : @-1];

  if (!title && !message) {
    RCTLogError(@"Must specify either an alert title, or message, or both");
    return;
  }

  if (buttons.count == 0) {
    if (type == RCTAlertViewStyleDefault) {
      buttons = @[@{@"0": RCTUIKitLocalizedString(@"OK")}];
      cancelButtonKey = @"0";
    } else {
      buttons = @[
        @{@"0": RCTUIKitLocalizedString(@"OK")},
        @{@"1": RCTUIKitLocalizedString(@"Cancel")},
      ];
      cancelButtonKey = @"1";
    }
  }

  UIAlertController *alertController = [UIAlertController
                                        alertControllerWithTitle:title
                                        message:nil
                                        preferredStyle:UIAlertControllerStyleAlert];
  switch (type) {
    case RCTAlertViewStylePlainTextInput: {
      [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.secureTextEntry = NO;
        textField.text = defaultValue;
        textField.keyboardType = keyboardType;
      }];
      break;
    }
    case RCTAlertViewStyleSecureTextInput: {
      [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = RCTUIKitLocalizedString(@"Password");
        textField.secureTextEntry = YES;
        textField.text = defaultValue;
        textField.keyboardType = keyboardType;
      }];
      break;
    }
    case RCTAlertViewStyleLoginAndPasswordInput: {
      [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = RCTUIKitLocalizedString(@"Login");
        textField.text = defaultValue;
        textField.keyboardType = keyboardType;
      }];
      [alertController addTextFieldWithConfigurationHandler:^(UITextField *textField) {
        textField.placeholder = RCTUIKitLocalizedString(@"Password");
        textField.secureTextEntry = YES;
      }];
      break;
    }
    case RCTAlertViewStyleDefault:
      break;
  }

  alertController.message = message;

  for (NSDictionary<NSString *, id> *button in buttons) {
    if (button.count != 1) {
      RCTLogError(@"Button definitions should have exactly one key.");
    }
    NSString *buttonKey = button.allKeys.firstObject;
    NSString *buttonTitle = [RCTConvert NSString:button[buttonKey]];
    UIAlertActionStyle buttonStyle = UIAlertActionStyleDefault;
    if ([buttonKey isEqualToString:cancelButtonKey]) {
      buttonStyle = UIAlertActionStyleCancel;
    } else if ([buttonKey isEqualToString:destructiveButtonKey]) {
      buttonStyle = UIAlertActionStyleDestructive;
    }
    __weak UIAlertController *weakAlertController = alertController;
    [alertController addAction:[UIAlertAction actionWithTitle:buttonTitle
                                                        style:buttonStyle
                                                      handler:^(__unused UIAlertAction *action) {
      switch (type) {
        case RCTAlertViewStylePlainTextInput:
        case RCTAlertViewStyleSecureTextInput:
          callback(@[buttonKey, [weakAlertController.textFields.firstObject text]]);
          break;
        case RCTAlertViewStyleLoginAndPasswordInput: {
          NSDictionary<NSString *, NSString *> *loginCredentials = @{
            @"login": [weakAlertController.textFields.firstObject text],
            @"password": [weakAlertController.textFields.lastObject text]
          };
          callback(@[buttonKey, loginCredentials]);
          break;
        }
        case RCTAlertViewStyleDefault:
          callback(@[buttonKey]);
          break;
      }
    }]];
  }

  if (!_alertControllers) {
    _alertControllers = [NSHashTable weakObjectsHashTable];
  }
  [_alertControllers addObject:alertController];

  dispatch_async(dispatch_get_main_queue(), ^{
    UIView *view = [self.bridge.uiManager viewForReactTag:reactTag];
    UIViewController *presentingController = RCTPresentedViewController(view.window);

    if (presentingController == nil) {
      RCTLogError(@"Tried to display alert view but there is no application window. args: %@", @{
        @"title": args.title() ?: [NSNull null],
        @"message": args.message() ?: [NSNull null],
        @"buttons": RCTConvertOptionalVecToArray(args.buttons(), ^id(id<NSObject> element) { return element; }) ?: [NSNull null],
        @"type": args.type() ?: [NSNull null],
        @"defaultValue": args.defaultValue() ?: [NSNull null],
        @"cancelButtonKey": args.cancelButtonKey() ?: [NSNull null],
        @"destructiveButtonKey": args.destructiveButtonKey() ?: [NSNull null],
        @"keyboardType": args.keyboardType() ?: [NSNull null],
      });
      return;
    }

    [presentingController presentViewController:alertController animated:YES completion:nil];
  });
}

- (std::shared_ptr<facebook::react::TurboModule>)getTurboModuleWithJsInvoker:(std::shared_ptr<facebook::react::CallInvoker>)jsInvoker
{
  return std::make_shared<facebook::react::NativeAlertManagerSpecJSI>(self, jsInvoker);
}

@end

Class RCTAlertManagerCls(void) {
  return RCTAlertManager.class;
}