xref: /expo/packages/expo-screen-capture/ios/EXScreenCapture/EXScreenCaptureModule.m (revision ce247f03)

// Copyright 2018-present 650 Industries. All rights reserved.

#import <EXScreenCapture/EXScreenCaptureModule.h>

@interface EXScreenCaptureModule ()

@property (nonatomic, weak) UMModuleRegistry *moduleRegistry;

@end

@implementation EXScreenCaptureModule {
  UIView *_blockView;
}

- (instancetype)init {
  if (self = [super init]) {
    CGFloat boundLength = MAX([[UIScreen mainScreen] bounds].size.width, [[UIScreen mainScreen] bounds].size.height);
    _blockView = [[UIView alloc] initWithFrame:CGRectMake(0, 0, boundLength, boundLength)];
    _blockView.backgroundColor = UIColor.blackColor;
  }
  return self;
}

UM_EXPORT_MODULE(ExpoScreenCapture);

- (void)setModuleRegistry:(UMModuleRegistry *)moduleRegistry
{
  _moduleRegistry = moduleRegistry;
}

UM_EXPORT_METHOD_AS(preventScreenCapture,
                    preventScreenCaptureWithResolver:(UMPromiseResolveBlock)resolve
                    reject:(UMPromiseRejectBlock)reject)
{
  if (@available(iOS 11.0, *) ) {
    // If already recording, block it
    dispatch_async(dispatch_get_main_queue(), ^{
      [self preventScreenRecording];
    });

    // Avoid setting duplicate observers
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIScreenCapturedDidChangeNotification object:nil];

    [[NSNotificationCenter defaultCenter] addObserver:self selector:@selector(preventScreenRecording) name:UIScreenCapturedDidChangeNotification object:nil];
  }

  resolve([NSNull null]);
}

UM_EXPORT_METHOD_AS(allowScreenCapture,
                    allowScreenCaptureWithResolver:(UMPromiseResolveBlock)resolve
                    rejecter:(UMPromiseRejectBlock)reject)
{
  if (@available(iOS 11.0, *)) {
    [[NSNotificationCenter defaultCenter] removeObserver:self name:UIScreenCapturedDidChangeNotification object:nil];
  }

  resolve([NSNull null]);
}

- (void)preventScreenRecording {
  if (@available(iOS 11.0, *)) {
    BOOL isCaptured = [[UIScreen mainScreen] isCaptured];

    if (isCaptured) {
      [UIApplication.sharedApplication.keyWindow.subviews.firstObject addSubview:_blockView];
    } else {
      [_blockView removeFromSuperview];
    }
  }
}

@end