Question

我想在uitableview中的所有未选定单元格上方添加透明图层。我实现了以下代码：

-(void)tableView:(UITableView *)tableView didSelectRowAtIndexPath:(NSIndexPath *)indexPath {

    customCell *selectedCell = (customCell*)[tableView cellForRowAtIndexPath:indexPath];

    overlayAboveSelectedCell = [[UIView alloc] initWithFrame:CGRectMake(listViewTable.frameOrigin.x, listViewTable.frame.origin.y, listViewTable.frameWidth, selectedCell.frameOrigin.y)];
    overlayAboveSelectedCell.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
    [self.view insertSubview:overlayAboveSelectedCell aboveSubview:listViewTable];

    overlayBellowSelectedCell = [[UIView alloc] initWithFrame:CGRectMake(listViewTable.frameOrigin.x, selectedCell.frameOrigin.y+selectedCell.frameHeight, listViewTable.frameWidth, listViewTable.frameHeight-selectedCell.frameOrigin.y-selectedCell.frameHeight)];
    overlayBellowSelectedCell.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
    [self.view insertSubview:overlayBellowSelectedCell aboveSubview:listViewTable];

    listViewTable.scrollEnabled = NO;

    [selectedCell doSomething];
}

它有效但有一个例外 - 所有坐标都是针对原始单元格位置计算的（即，即使用户向下滚动，单元格原点也保持不变，因此屏幕上不应该变暗的部分可能会被错误地放置。我怎样才能修改代码，以便考虑所选单元格的实际坐标？

Answer 1

使用Nick对Get UITableviewCell position from "visible" area or window的回答我能够获得所选单元格的当前位置。

新实施：

customCell *selectedCell = (customCell*)[tableView cellForRowAtIndexPath:indexPath];
CGRect position = [tableView convertRect:[tableView rectForRowAtIndexPath:indexPath] toView:[tableView superview]];

overlayAboveSelectedCell = [[UIView alloc] initWithFrame:CGRectMake(listViewTable.frame.origin.x, listViewTable.frame.origin.y, listViewTable.frameWidth, position.origin.y)];
overlayAboveSelectedCell.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
[self.view insertSubview:overlayAboveSelectedCell aboveSubview:listViewTable];

overlayBellowSelectedCell = [[UIView alloc] initWithFrame:CGRectMake(listViewTable.frameOrigin.x, position.origin.y+selectedCell.frameHeight, listViewTable.frameWidth, listViewTable.frameHeight-position.origin.y-selectedCell.frameHeight)];
overlayBellowSelectedCell.backgroundColor = [UIColor colorWithWhite:0 alpha:0.5];
[self.view insertSubview:overlayBellowSelectedCell aboveSubview:listViewTable];

listViewTable.scrollEnabled = NO;

在uitableview中，灯箱类似于所选单元格的效果

1 个答案: