StackOverflow2013

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POadding and removing layer over UITableViewCell
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copied!<p>i have a tableview of devices that may or not be connected. if a device is connected, there is an on/off switch (in accessory view) to control it. if it is disconnected, the switched is replaced by a disconnect symbol. so far,so good. Now, i want to add a layer to grey out the cell if it is disconnected, and obviously have the layer disappear if it is connected. (for testing, I just have this wired to a button to toggle state. I have figured out how to place the layer, but i can't remove it. click one-displays the layer, click two-does nothing, click three-makes layer even darker, etc. until it is completely black. the block is being called because with each click, i see the log statement:greyString is 1" or greyString is 0. i have tried [layer setHidden:YES],[layer removeFromSuperlayer] and layer.backroughColr=clearColor, to no effect</p> <pre><code>- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath </code></pre> <p>{</p> <pre><code>UITableViewCell *cell = [tableView dequeueReusableCellWithIdentifier:CellIdentifier]; if (cell == nil) { cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleDefault reuseIdentifier:CellIdentifier]; cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator; } NamedUISwitch *mySwitch = [[NamedUISwitch alloc] initWithFrame:CGRectZero]; mySwitch.indexPath = indexPath; mySwitch.pathRow=indexPath.row; [mySwitch addTarget:self action:@selector(changeDeviceState:) forControlEvents:UIControlEventValueChanged]; cell.accessoryView=mySwitch; if ([[plugStates objectAtIndex:indexPath.row] isEqualToString:@"11"]) { cell.imageView.image=greenOn; mySwitch.on=YES; }else{ cell.imageView.image=greenOff; mySwitch.on=NO; } cell.backgroundView =[[UIImageView alloc] init]; cell.selectedBackgroundView =[[UIImageView alloc] init]; UIImage *rowBackground; UIImage *selectionBackground; NSInteger sectionRows = [self.tableView numberOfRowsInSection:[indexPath section]]; NSInteger row = [indexPath row]; if (row==1) { CALayer *mainLayer=cell.contentView.layer; CALayer *greyOut=[CALayer layer]; CGRect frame = [tableView rectForRowAtIndexPath:indexPath]; greyOut.frame=CGRectMake(0, mainLayer.frame.origin.y, frame.size.width, frame.size.height); CGColorRef darkColor = [[UIColor blackColor] colorWithAlphaComponent:.5f].CGColor; CGColorRef clearColor = [UIColor clearColor].CGColor; greyOut.backgroundColor=darkColor; [mainLayer addSublayer:greyOut]; if ([[[self.plugStates objectAtIndex:1] substringWithRange:NSMakeRange(0, 1)] isEqualToString:@"0"]){ [greyOut setHidden:NO]; cell.accessoryView =[[UIImageView alloc]initWithImage:[UIImage imageNamed:@"disconnect70.png"]]; NSLog(@"greyString is 0"); }else{ NSLog(@"greyString is 1"); NSLog(@"superlayer is %@",greyOut.superlayer); greyOut.backgroundColor=clearColor; [greyOut setHidden:YES]; //[greyOut removeFromSuperlayer]; } } cell.textLabel.text = deviceName; return cell; </code></pre> <p>}</p>

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