NSTableView operations in iPhone development applications

IPhone DevelopmentApplication in progressNSTableViewRelevant operations are described in this article, mainly to learnNSTableViewHow to UseNSTableViewDrag/drop replacement and insert are also supported.

When yourNSTableViewAs a drag-and-drop target, you may wish to support both drag-and-drop replacement of the current project, or drag and drop to insert a new project in the current position. You need to use NSTableView's-setDropRow: dropOperation: method. This article describes how to implement the drag-and-drop function of NSTableView through code.

The Code is as follows:

 
 

  
  
- (NSDragOperation) tableView: (NSTableView *) view  
  
  
                 validateDrop: (id ) info  
  
  
                  proposedRow: (int) row  
  
  
        proposedDropOperation: (NSTableViewDropOperation) op  
  
  
{  
  
  
    [view setDropRow: row  
  
  
               dropOperation: op];  
  
  
    NSDragOperation dragOp = NSDragOperationCopy;  
  
  
    return (dragOp);  
  
  
} 
 
 

In addition, perform the following operations in the acceptDrop method:

 
 

  
  
-(BOOL) tableView: (NSTableView *) view
  
  
AcceptDrop: (id) info
  
  
Row: (int) row
  
  
DropOperation: (NSTableViewDropOperation) op
  
  
{
  
  
If (op = NSTableViewDropOn ){
  
  
// Replace
  
  
} Else if (op = nstableviewdropabve ){
  
  
// Insert
  
  
} Else {
  
  
NSLog (@ "unexpected operation (% d) in % s ",
  
  
Op, _ FUNCTION __);
  
  
}
  
  
Return (YES );
  
  
}
 
 

Get a notification when the NSTableView option is changed

The Code is as follows:

 
 

  
  
- (void) tableViewSelectionDidChange: (NSNotification *) notification  
  
  
{  
  
  
    int row;  
  
  
    row = [tableView selectedRow];  
  
  
              
  
  
    if (row == -1) {  
  
  
        //do stuff for the no-rows-selected case  
  
  
    }   
  
  
      
  
  
    else {  
  
  
       // do stuff for the selected row  
  
  
    }  
  
  
}  
 
 

This code should be placed in the delegate of NSTableView. If no delegate exists, you can set it to delegate.

Summary:IPhone DevelopmentApplication in progressNSTableViewThe related operations have been introduced. I hope this article will help you!