tableview, change font color of focus tvos - objective-c

Question

How do you change the font color of a "focused" UITableView cell? I currently have this....
- (void)didUpdateFocusInContext:(UIFocusUpdateContext *)context withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator {
if (context.nextFocusedView) {
CategoryCell *cell = [self.categoryTableView dequeueReusableCellWithIdentifier:#"CategoryCell"];
[cell.categoryLbl setTextColor:[UIColor orangeColor]];
}
}
I know that if you want to change a background of a focused UITableViewCell it would be:
- (void)didUpdateFocusInContext:(UIFocusUpdateContext *)context withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator {
[context.nextFocusedView setBackgroundColor:[UIColor clearColor]];
[context.previouslyFocusedView setBackgroundColor:[UIColor orangeColor]];
}

Answer 1

In TVOS UITableViewDelegate have new method tableView:didUpdateFocusInContext:withAnimationCoordinator: which will be called when focus change, you can get previous IndexPath and nextFocusIndexPath and then you can use tableView methods to get cells, your code should look like this
- (void)tableView:(UITableView *)tableView didUpdateFocusInContext:(UITableViewFocusUpdateContext *)context withAnimationCoordinator:(UIFocusAnimationCoordinator *)coordinator
{
NSIndexPath *prevIndexPath = [context previouslyFocusedIndexPath];
if (prevIndexPath)
{
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:prevIndexPath];
cell.textLabel.textColor = [UIColor white];
}
NSIndexPath *nextIndexPath = [context nextFocusedIndexPath];
if (nextIndexPath)
{
UITableViewCell *cell = [self.tableView cellForRowAtIndexPath:nextIndexPath];
cell.textLabel.textColor = [UIColor blackColor];
}
}
Please visit this Apple docs for more detail

Answer 2

Here is my approach using Swift 2.0 :)
func tableView(tableView: UITableView, didUpdateFocusInContext context: UITableViewFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
if let prevIndexPath = context.previouslyFocusedIndexPath {
let prevCell = tableView.cellForRowAtIndexPath(prevIndexPath)
prevCell?.backgroundColor = UIColor.blackColor()
}
if let nextIndexPath = context.nextFocusedIndexPath {
let nextCell = tableView.cellForRowAtIndexPath(nextIndexPath)
nextCell?.backgroundColor = UIColor.whiteColor()
}
}

Answer 3

Here's a good solution in swift 2.0.
func tableView(tableView: UITableView, didUpdateFocusInContext context: UITableViewFocusUpdateContext, withAnimationCoordinator coordinator: UIFocusAnimationCoordinator) {
if ((context.previouslyFocusedIndexPath) != nil) {
let cell = tableView.cellForRowAtIndexPath(context.previouslyFocusedIndexPath!)
cell?.textLabel?.textColor = UIColor.whiteColor()
}
if ((context.nextFocusedIndexPath) != nil) {
let cell = tableView.cellForRowAtIndexPath(context.nextFocusedIndexPath!)
cell?.textLabel?.textColor = UIColor.blackColor()
}
}

Answer 4

Here is what you want to achieve in Swift 5.2:
func tableView(_ tableView: UITableView, didUpdateFocusIn context: UITableViewFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
if let prevIndexPath = context.previouslyFocusedIndexPath {
let prevCell = tableView.cellForRow(at: prevIndexPath) as! TVHomeCell
prevCell.titleLabel.font = .systemFont(ofSize: 32, weight: .medium)
}
if let nextIndexPath = context.nextFocusedIndexPath {
let nextCell = tableView.cellForRow(at: nextIndexPath) as! TVHomeCell
nextCell.titleLabel.font = .systemFont(ofSize: 34, weight: .bold)
}
}

Answer 5

You can change colour by using context , it contain reference of previously focused cell and the current cell that is focused. just cast it to your cell type and then perform the colour change operation.
override func didUpdateFocus(in context: UIFocusUpdateContext, with coordinator: UIFocusAnimationCoordinator) {
if let prevIndex = context.previouslyFocusedItem{
if let myCell = prevIndex as? Mycell {
myCell.textLabel.textColor = UIColor.white
}
}
if let nextIndex = context.nextFocusedItem {
if let myCell = nextIndex as? MyCell {
myCell.textLabel.textColor = UIColor.black
}
}
}