几行代码解决问题，有2个方案往下看
说到iOS防截屏大部分人肯定说无法实现，但是我在这样回复了老板后，老板给我答复是：爱奇艺，实现了！！！（付费视频）

飞书20211110-135317(1).gif

首先我把吧图片生成一帧帧的加密流视频

+ (CVPixelBufferRef) pixelBufferFromCGImage: (CGImageRef) image {
    
    CGSize size = CGSizeMake(CGImageGetWidth(image), CGImageGetHeight(image));
    
    NSDictionary *options = [NSDictionary dictionaryWithObjectsAndKeys:
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGImageCompatibilityKey,
                             [NSNumber numberWithBool:YES], kCVPixelBufferCGBitmapContextCompatibilityKey,
                             nil];
    CVPixelBufferRef pxbuffer = NULL;
    
    CVReturn status = CVPixelBufferCreate(kCFAllocatorDefault,
                                          size.width,
                                          size.height,
                                          kCVPixelFormatType_32ARGB,
                                          (__bridge CFDictionaryRef) options,
                                          &pxbuffer);
    if (status != kCVReturnSuccess){
        NSLog(@"Failed to create pixel buffer");
    }
    
    CVPixelBufferLockBaseAddress(pxbuffer, 0);
    void *pxdata = CVPixelBufferGetBaseAddress(pxbuffer);
    
    
    CGColorSpaceRef rgbColorSpace = CGColorSpaceCreateDeviceRGB();
    CGContextRef context = CGBitmapContextCreate(pxdata, size.width,
                                                 size.height, 8, 4*size.width, rgbColorSpace,
                                                 kCGImageAlphaPremultipliedFirst);
    //kCGImageAlphaNoneSkipFirst);
    CGContextConcatCTM(context, CGAffineTransformMakeRotation(0));
    CGContextDrawImage(context, CGRectMake(0, 0, CGImageGetWidth(image),
                                           CGImageGetHeight(image)), image);
    CGColorSpaceRelease(rgbColorSpace);
    CGContextRelease(context);
    
    CVPixelBufferUnlockBaseAddress(pxbuffer, 0);
    
    return pxbuffer;
}

接着，我将它制作成视频

+ (void)imageToMP4:(UIImage *)img completion:(void (^)(NSData *))handler {
    NSError *error = nil;
    
    NSFileManager *fileMgr = [NSFileManager defaultManager];
    NSString *documentsDirectory = [NSHomeDirectory()
                                    stringByAppendingPathComponent:@"tmp"];
    NSString *videoOutputPath = [documentsDirectory stringByAppendingPathComponent:@"test_output.mp4"];
    if ([fileMgr removeItemAtPath:videoOutputPath error:&error] != YES)
        NSLog(@"Unable to delete file: %@", [error localizedDescription]);
    
    CGSize imageSize = CGSizeMake(img.size.width, img.size.height);
    NSUInteger fps = 5;
    NSArray *imageArray = @[img];
    
    NSLog(@"videoOutputPath========%@", videoOutputPath);

    NSLog(@"Start building video from defined frames.");
    
    AVAssetWriter *videoWriter = [[AVAssetWriter alloc] initWithURL:
                                  [NSURL fileURLWithPath:videoOutputPath] fileType:AVFileTypeQuickTimeMovie
                                                              error:&error];
    /// !!!需要设置faststart
    videoWriter.shouldOptimizeForNetworkUse = YES;
    NSParameterAssert(videoWriter);
    
    NSDictionary *videoSettings = [NSDictionary dictionaryWithObjectsAndKeys:
                                   AVVideoCodecTypeH264, AVVideoCodecKey,
                                   [NSNumber numberWithInt:imageSize.width], AVVideoWidthKey,
                                   [NSNumber numberWithInt:imageSize.height], AVVideoHeightKey,
                                   nil];
        
    AVAssetWriterInput* videoWriterInput = [AVAssetWriterInput
                                            assetWriterInputWithMediaType:AVMediaTypeVideo
                                            outputSettings:videoSettings];
    
    
    AVAssetWriterInputPixelBufferAdaptor *adaptor = [AVAssetWriterInputPixelBufferAdaptor
                                                     assetWriterInputPixelBufferAdaptorWithAssetWriterInput:videoWriterInput
                                                     sourcePixelBufferAttributes:nil];
    
    NSParameterAssert(videoWriterInput);
    NSParameterAssert([videoWriter canAddInput:videoWriterInput]);
    videoWriterInput.expectsMediaDataInRealTime = YES;
    [videoWriter addInput:videoWriterInput];
    
    //Start a session:
    [videoWriter startWriting];
    [videoWriter startSessionAtSourceTime:kCMTimeZero];
    
    CVPixelBufferRef buffer = NULL;
    
    //convert uiimage to CGImage.
    int frameCount = 0;
    double numberOfSecondsPerFrame = 1;
    double frameDuration = fps * numberOfSecondsPerFrame;
    
    //for(VideoFrame * frm in imageArray)
    NSLog(@"**************************************************");
    for(UIImage * img in imageArray)
    {
        //UIImage * img = frm._imageFrame;
        buffer = [self pixelBufferFromCGImage:[img CGImage]];
        
        BOOL append_ok = NO;
        int j = 0;
        while (!append_ok && j < 30) {
            if (adaptor.assetWriterInput.readyForMoreMediaData)  {
                //print out status:
                NSLog(@"Processing video frame (%d,%lu)",frameCount,(unsigned long)[imageArray count]);
                
                CMTime frameTime = CMTimeMake(frameCount*frameDuration,(int32_t) fps);
                append_ok = [adaptor appendPixelBuffer:buffer withPresentationTime:frameTime];
                if(!append_ok){
                    NSError *error = videoWriter.error;
                    if(error!=nil) {
                        NSLog(@"Unresolved error %@,%@.", error, [error userInfo]);
                    }
                }
            }
            else {
                printf("adaptor not ready %d, %d\n", frameCount, j);
                [NSThread sleepForTimeInterval:0.1];
            }
            j++;
        }
        if (!append_ok) {
            printf("error appending image %d times %d\n, with error.", frameCount, j);
        }
        frameCount++;
    }
    NSLog(@"**************************************************");
    
    //Finish the session:
    [videoWriterInput markAsFinished];
    [videoWriter finishWritingWithCompletionHandler:^{
        if (handler) {
            NSData *data = [NSData dataWithContentsOfFile:videoOutputPath];
            handler(data);
        }
    }];
}

最后完成。有些小伙伴可能会发现图片变形了，那就是最大的坑了，绘制图片需要宽度是16的整数倍于是开码：

+ (UIImage *)composite_Picture:(UIImage *)image{
    CGSize imageContSize = CGSizeMake(((int)image.size.width/16+1)*16, ((int)image.size.width/16+1)*16/(image.size.width/image.size.height));
    //开启图形上下文
    UIGraphicsBeginImageContext(imageContSize);
    
    [image drawInRect:CGRectMake(0, 0, imageContSize.width, imageContSize.height)];
    //获取图片
    UIImage *newImage = UIGraphicsGetImageFromCurrentImageContext();
    //关闭上下文
    UIGraphicsEndImageContext();
    
    NSLog(@"%f%f",newImage.size.width,newImage.size.height);
    
    return newImage;
}

请真机运行，进入Demo先点生成视频，在截图。如果对您有帮助，麻烦您点赞点赞，谢谢！
demo传送门：https://gitee.com/shyzine/i-os-anti-screenshot.git 不赞不回，谢谢

方案二：
任何添加到返回View上的控件，全部防截屏
swift代码

static func makeSecView() -> UIView {
        let field = UITextField()
        field.isSecureTextEntry = true
        guard let view = field.subviews.first else {
            return UIView()
        }
        view.subviews.forEach { $0.removeFromSuperview() }
        view.isUserInteractionEnabled = true
        return view
    }

OC代码

-(UIView *)getBgView{
    UITextField *bgTextField = [[UITextField alloc] init];
    [bgTextField setSecureTextEntry:true];
    
    UIView *bgView = bgTextField.subviews.firstObject;
    [bgView setUserInteractionEnabled:true];
    return bgView;
}