Ответ от @jvanmetre велик, и он работает. Основываясь на этом и, как предложил @SergiySalyuk в комментариях. Я обновляю код, чтобы использовать UIBezierPath вместо упрощения понимания и немного быстрее.
Моя версия также исправляет ошибку разделителя и добавляет выбранный фоновый вид, который подходит для ячейки.
Не забудьте установить в виде таблицы разделитель: tableView.separatorStyle = UITableViewCellSeparatorStyleNone;
Objective-C
- (void)tableView:(UITableView*)tableView willDisplayCell:(UITableViewCell*)cell forRowAtIndexPath:(NSIndexPath*)indexPath {
// Set transparent background so we can see the layer
cell.backgroundColor = UIColor.clearColor;
// Declare two layers: one for the background and one for the selecetdBackground
CAShapeLayer *backgroundLayer = [CAShapeLayer layer];
CAShapeLayer *selectedBackgroundLayer = [[CAShapeLayer alloc] init];
CGRect bounds = CGRectInset(cell.bounds, 0, 0);//Cell bounds feel free to adjust insets.
BOOL addSeparator = NO;// Controls if we should add a seperator
// Determine which corners should be rounded
if (indexPath.row == 0 && indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
// This is the only row in its section, round all corners
backgroundLayer.path = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:UIRectCornerAllCorners cornerRadii:CGSizeMake(7, 7)].CGPath;
} else if (indexPath.row == 0) {
// First row, round the top two corners.
backgroundLayer.path = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:UIRectCornerTopLeft | UIRectCornerTopRight cornerRadii:CGSizeMake(7, 7)].CGPath;
addSeparator = YES;
} else if (indexPath.row == [tableView numberOfRowsInSection:indexPath.section]-1) {
// Bottom row, round the bottom two corners.
backgroundLayer.path = [UIBezierPath bezierPathWithRoundedRect:bounds byRoundingCorners:UIRectCornerBottomLeft | UIRectCornerBottomRight cornerRadii:CGSizeMake(7, 7)].CGPath;
} else {
// Somewhere between the first and last row don't round anything but add a seperator
backgroundLayer.path = [UIBezierPath bezierPathWithRect:bounds].CGPath;// So we have a background
addSeparator = YES;
}
// Copy the same path for the selected background layer
selectedBackgroundLayer.path = CGPathCreateCopy(backgroundLayer.path);
// Yay colors!
backgroundLayer.fillColor = [UIColor colorWithWhite:1.f alpha:0.8f].CGColor;
selectedBackgroundLayer.fillColor = [UIColor grayColor].CGColor;
// Draw seperator if necessary
if (addSeparator == YES) {
CALayer *separatorLayer = [CALayer layer];
CGFloat separatorHeight = (1.f / [UIScreen mainScreen].scale);
separatorLayer.frame = CGRectMake(CGRectGetMinX(bounds)+10, bounds.size.height-separatorHeight, bounds.size.width-10, separatorHeight);
separatorLayer.backgroundColor = tableView.separatorColor.CGColor;
[backgroundLayer addSublayer:separatorLayer];
}
// Create a UIView from these layers and set them to the cell's .backgroundView and .selectedBackgroundView
UIView *backgroundView = [[UIView alloc] initWithFrame:bounds];
[backgroundView.layer insertSublayer:backgroundLayer atIndex:0];
backgroundView.backgroundColor = UIColor.clearColor;
cell.backgroundView = backgroundView;
UIView *selectedBackgroundView = [[UIView alloc] initWithFrame:bounds];
[selectedBackgroundView.layer insertSublayer:selectedBackgroundLayer atIndex:0];
selectedBackgroundView.backgroundColor = UIColor.clearColor;
cell.selectedBackgroundView = selectedBackgroundView;
}