Question

在我的ipad应用中，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：

＆＃34; newIndexPath＆＃34;我得到的是一个数字（tableview中的行），按钮被删除。这个＆＃34; insertcell＆＃34;方法在没有滚动表视图的情况下工作正常，

滚动TableView时＃34; rowAtPoint＆＃34;返回一个数字，它是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处删除按钮时，将在INDEXPATH 8中插入一个单元格。

我需要建议在一个表格中获取EXACT索引路径。提供了＆＃34;点＆＃34;是自我视图中的CGPoint。

Answer 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];

在uitableview的中间插入单元格

1 个答案: