Prevent UITableviewcell from becoming transparent during reordering

Question

I am trying to keep my uitableviewcells opaque during reorder animation - reason being that I am doing custom drawing of the cell in one view to enhance scroll performance, but doing this slows down the reorder animation significantly.

Any idea how to achieve this?

Answer 1

For an excellent description of what is going on when the table is in dragging mode, see this answer.

I had a UITableViewStyleGrouped on iOS 7. In order to get the desired effect (non-transparent, white background), I had to follow Aaron's suggestion and bmovement's.

@interface ABCCell : UITableViewCell

@end

@implementation ABCCell

- (id)initWithCoder:(NSCoder *)aDecoder {
    self = [super initWithCoder:aDecoder];
    if (self) {
        self.backgroundView = [UIView new];
        self.backgroundView.backgroundColor = [UIColor whiteColor];
    }
    return self;
}

- (void)setAlpha:(CGFloat)alpha {
    [super setAlpha:1.0];
}

@end

Not doing either causes the view to have a 100% transparent background.

Setting just the background view causes the cell to have a 80% transparent white background.

Setting just the alpha causes the cell to have a black background (0% transparent).

Implementing both, gives you a white background (0% transparent).

Answer 2

For some reason, my UITableViewCell subclass's drawRect wasn't being called when the reorder animation began, but adding this to my subclass worked for me:

- (void)setAlpha:(CGFloat)alpha {
    [super setAlpha:1.0f];
}