To make a UITableView transparent, you just need to set it’s opaque property to NO and make the background clear.

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-(void)viewDidLoad {
  [super viewDidLoad];

  // assuming you are in a view controller and it contains
  // a property called tableView
  self.tableView.opaque = NO;
  self.tableView.backgroundColor = [UIColor clearColor];
}

Now whatever you have behind your UITableView will shine through. This technique works for all other UIView subclasses too (UITextView, etc…).