IOS development implementation code for ios video screenshots

//screenshotstatic int i=0; 
-(IBAction)screenShot:(id)sender{ 
   
  UIGraphicsBeginImageContextWithOptions(CGSizeMake(640, 960), YES, 0); 
  [[ layer] renderInContext:UIGraphicsGetCurrentContext()]; 
  UIImage *viewImage = UIGraphicsGetImageFromCurrentImageContext(); 
  UIGraphicsEndImageContext(); 
  CGImageRef imageRef = ; 
  CGRect rect =CGRectMake(166, 211, 426, 320);// Here you can set the area you want to take a screenshot  CGImageRef imageRefRect =CGImageCreateWithImageInRect(imageRef, rect); 
  UIImage *sendImage = [[UIImage alloc] initWithCGImage:imageRefRect]; 
  UIImageWriteToSavedPhotosAlbum(sendImage, nil, nil, nil);//Save pictures to photo library  NSData *imageViewData = UIImagePNGRepresentation(sendImage); 
   
  NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES); 
  NSString *documentsDirectory = [paths objectAtIndex:0]; 
  NSString *pictureName= [NSString stringWithFormat:@"screenShow_%",i]; 
  NSString *savedImagePath = [documentsDirectory stringByAppendingPathComponent:pictureName]; 
  NSLog(@"%@", savedImagePath); 
  [imageViewData writeToFile:savedImagePath atomically:YES];//Save photos to sandbox directory  CGImageRelease(imageRefRect); 
  i++; 
}