Animate removal of UITableViewCellAccessory

Is there any way to animate the removal of a UITableView cell accessory?

I currently am showing a UITableViewCellAccessoryDisclosureIndicator, but I would like to animate swapping the disclosure indicator with a UISwitch on all visible table cells.

I've tried something like this:

[UIView animateWithDuration:0.3
                 animations:^{
                  开发者_如何学Go for (SwitchTableViewCell *cell in self.tableView.visibleCells)
                   {
                     cell.accessoryType = UITableViewCellAccessoryNone;
                   }                     
                 }];

... but unfortunately that has no affect. The disclosure indicator abruptly disappears and the contentView width jumps in one step, rather than a smooth transition.

accessoryType is not an animatable property. There are two ways you can do this, depending on your situation. The easiest only applies if you are changing the accessory to a UISwitch because of entering the editing state. In this case, just usecell.editingAccessoryType = theSwitch; in your tableView:cellForRowAtIndexPath: method. The table view will then do a fade in/out automatically when entering editing mode.

If you are doing this outside of editing mode, then the following code will do what you want:

[UIView animateWithDuration:0.3 animations:^{
    for(SwitchTableViewCell *cell in self.tableView.visibleCells) {
        [[cell valueForKey:@"_accessoryView"] setAlpha:0.0];
    }
} completion:^(BOOL done) {
    for(SwitchTableViewCell *cell in self.tableView.visibleCells) {
        cell.accessoryView = theSwitch;
    }
}];

However, I do not know if this code will make it into the app store since it uses the hidden property _accessoryView.