Question

I have to develop an iPad TV guide that looks like
What’s On TV.

I tried to do it using a UITableView with many row as the number of channels. In order to create a kind of grid, I added a subview for each row that contains all the programs (UIButton with different size). In order to scroll the view horizontally I added gesture recognizer and change the UIView (subview cell) position every time I swipe right or left.

That works, but the solution seems to me a bit messy and the animation is not so reactive. Do you have any idea (or example) for a better solution? What about html5?

Thanks

My code:

in ViewController.m

- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath {


   static NSString *CellIdentifier = @"Cell";
   UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier];

   [cell setSelectionStyle:UITableViewCellSelectionStyleNone];

   _chName = (UILabel *)[cell viewWithTag:4];
   _chName.text=((Channel *)[_resultEPGChannel objectAtIndex:indexPath.row]).name;

   _viewCell = (UIView *)[cell viewWithTag:2];
   _viewCell.frame=CGRectMake(-_positionView, 0,2000, 77);

  //add the view to the _viewCell (moving view) with the right program for each channel (row)
  cp = [[ChannelProgram alloc] init] ;
  cp.allProgram=[_resultEPGProgram objectAtIndex:indexPath.row];

  [_viewCell addSubview:cp];

  return cell;}

In ChannelProgram.m (subclass of UIView)

 - (void)drawRect:(CGRect)rect{

    int xPoint=2;

    for (Program *singleProgram in allProgram) {

        UIButton *button = [UIButton buttonWithType:UIButtonTypeCustom];

        button.backgroundColor=[UIColor lightGrayColor];

        [button setTitle:singleProgram.title forState:UIControlStateNormal];
        button.frame=CGRectMake(xPoint,0, singleProgram.lengthProgram,75);
        [self addSubview:button];
        xPoint = xPoint+singleProgram.lengthProgram+2;}

The animation it’s very slow, and become worst every time I had to reload the table. What’s wrong?

Answer 1

Event drawRect is own draw, every time redraw you will create new UIButton, so you may get a lot of UIButton far more than you need.

UIButton is a control, you can just add it to ChannelProgram at - (id)initWithFrame:(CGRect)frame or - (id)initWithCoder:(NSCoder *)aDecoder, this will not cause any memory waste.