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在uitableview的中间插入单元格

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在我的ipad应用程序中,我需要拖放 UIButton 来插入一个单元格 . 我设法通过touchupinside事件拖动一个按钮并插入一个单元格 . 它适用于以下代码 -

//button1 is initially placed in a view called scrollview
[button1 addTarget:self action:@selector(imageMoved:withEvent:) forControlEvents:UIControlEventTouchDragInside];

[button1 removeTarget:self action:@selector(insertcell) forControlEvents:UIControlEventTouchUpInside];

CGPoint pointfordeterminingrow;

- (IBAction) imageMoved:(UIButton *) sender withEvent:(UIEvent *) event {

    CGPoint point = [[[event allTouches] anyObject] locationInView:self.view];
    UIControl *control = sender;
    control.center = point;

    pointfordeterminingrow=point;   // point where the button is hovering now

    if ([sender state] == UIGestureRecognizerStateBegan) {

        [self.view addSubview:sender];

    }

    if ([sender state] == UIGestureRecognizerStateChanged) {

        [scrollview addSubview:sender];

    }

    if ([sender state] == UIGestureRecognizerStateEnded) {

        [scrollview addSubview:sender];

    }

}

- (int)rowAtPoint:(CGPoint)point {

    NSIndexPath* newIndexPath = [MainTableView indexPathForRowAtPoint:point];
    return newIndexPath == nil ? [items count] : newIndexPath.row;

     //items is a mutable array has the content of each cell
}

-(void)insertcell {

    int row = [self rowAtPoint:pointfordeterminingrow];

    NSIndexPath* newIndexPath = [NSIndexPath indexPathForRow:row inSection:0];

    [self insertRowsAtIndexPaths:[NSArray arrayWithObject:[NSIndexPath                 indexPathForRow:newIndexPath.row inSection:0]] withRowAnimation:UITableViewRowAnimationFade];
}

这些代码在索引路径处插入一个单元格,在该索引路径上按下按钮//调用触摸方法 .

我的问题是:

我得到的“newIndexPath”是一个数字(tableview中的行),按钮被删除 . 这个“insertcell”方法在没有滚动tableview的情况下工作正常,

当滚动TableView时,“rowAtPoint”返回一个数字,该数字是indexpath的行,截至目前为止是可见的 .

换句话说,如果按钮被丢弃在索引路径58上方并且如果上面隐藏了50个单元格(通过滚动),我得到数字8,(不是58)

因此,当在索引路径58处按下按钮时,在INDEXPATH 8处插入单元 .

我需要建议在一个点的tableview中获取EXACT索引路径 . 如果“点”是自我视图中的CGPoint .

1 回答

  • 1

    试试这个:

    int row = [self rowAtPoint:pointfordeterminingrow];
    
    [myTableView visibleCells];  // call this first to avoid possible iOS bug in next statement
    NSArray *visIndexPaths = [myTableView indexPathsForVisibleRows]; 
    
    
    NSIndexPath* newIndexPath = [visIndexPaths objectAtIndex:row];
    

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