Neha Purwar Neha Purwar - 4 months ago 16x
Objective-C Question

adding textView as a subview of a view and adding this view to video

I am working in an application in which i am dealing with video . In this application i want to add the text with the video by using the

.For this i have created the
programmatically and added it as a subview of the
like this.

[self.view addSubview:textView];

But as soon as i add this view to the video like this--

[parentLayer addSublayer:textView];

i am getting the error like this--

Thread 1:EXC_BAD_ACCESS (Code=1 Address=0x18)

please help me for getting this.Following is code that i have done so far for achieve this.

if (!self.videoAsset) {
UIAlertView *alert = [[UIAlertView alloc] initWithTitle:@"Error" message:@"Please Load a Video Asset First"
delegate:nil cancelButtonTitle:@"OK" otherButtonTitles:nil];
[alert show];
AVMutableComposition* mixComposition = [AVMutableComposition composition];

AVMutableCompositionTrack *compositionVideoTrack = [mixComposition addMutableTrackWithMediaType:AVMediaTypeVideo preferredTrackID:kCMPersistentTrackID_Invalid];
AVAssetTrack *clipVideoTrack = [[self.videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
[compositionVideoTrack insertTimeRange:CMTimeRangeMake(kCMTimeZero, self.videoAsset.duration)
atTime:kCMTimeZero error:nil];

[compositionVideoTrack setPreferredTransform:[[[self.videoAsset tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0] preferredTransform]];

CALayer *aLayer = [CALayer layer];
aLayer.frame = CGRectMake(0, 0, 30, 30); //Needed for proper display. We are using the app icon (57x57). If you use 0,0 you will not see it
aLayer.opacity = 0.75; //Feel free to alter the alpha here
//Create layer with watermark text instead of image
CGSize videoSize = [self.videoAsset naturalSize];
UITextView *textView =[[UITextView alloc]init];
[textView setReturnKeyType:UIReturnKeyDone];
[self.view addSubview:textView];
CALayer *parentLayer = [CALayer layer];
CALayer *videoLayer = [CALayer layer];

parentLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height);
videoLayer.frame = CGRectMake(0, 0, videoSize.width, videoSize.height);
[parentLayer addSublayer:videoLayer];
[parentLayer addSublayer:aLayer];
[parentLayer addSublayer:textView]; //ONLY IF WE ADDED TEXT
//Create composition
AVMutableVideoComposition* videoComp = [AVMutableVideoComposition videoComposition];
videoComp.renderSize = videoSize;
videoComp.frameDuration = CMTimeMake(1, 30);
videoComp.animationTool = [AVVideoCompositionCoreAnimationTool videoCompositionCoreAnimationToolWithPostProcessingAsVideoLayer:videoLayer inLayer:parentLayer];
//Create instruction to insert layer
AVMutableVideoCompositionInstruction *instruction = [AVMutableVideoCompositionInstruction videoCompositionInstruction];
instruction.timeRange = CMTimeRangeMake(kCMTimeZero, [mixComposition duration]);
AVAssetTrack *videoTrack = [[mixComposition tracksWithMediaType:AVMediaTypeVideo] objectAtIndex:0];
AVMutableVideoCompositionLayerInstruction* layerInstruction = [AVMutableVideoCompositionLayerInstruction videoCompositionLayerInstructionWithAssetTrack:videoTrack];
instruction.layerInstructions = [NSArray arrayWithObject:layerInstruction];
videoComp.instructions = [NSArray arrayWithObject: instruction];

NSString *destPath = [[NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES)objectAtIndex:0]stringByAppendingPathComponent:@"NewwatermarkVideo.mp4"];
NSURL *exportUrl = [NSURL fileURLWithPath:destPath];

if ([[NSFileManager defaultManager] fileExistsAtPath:destPath])
[[NSFileManager defaultManager] removeItemAtPath:destPath error:nil];

AVAssetExportSession *exporter = [[AVAssetExportSession alloc] initWithAsset:mixComposition
exporter.outputFileType = AVFileTypeQuickTimeMovie;
exporter.shouldOptimizeForNetworkUse = YES;
exporter.videoComposition = videoComp;
[exporter exportAsynchronouslyWithCompletionHandler:^{
dispatch_async(dispatch_get_main_queue(), ^{
[self exportDidFinish:exporter];

Any help will be appreciated.


You can not add UIView subclass as sublayer to layer instanse. Try

[parentLayer addSublayer:textView.layer];

You are getting bad access because of type mismatch while adding sublayer. The desired type of param is UILayer subclass, but you used UIView instead.

Hope this helps.