Drag & drop (<NSDraggingDestination>) in Cocoa does not work - xcode

Question

I want to implement some "simple" drag & drop into my Mac application.
I dragged in a view and entered "MyView" in my nib file accordingly.However I do not get any response in my console (I try to log messages whenever any of the protocol methods are triggered)
I have subclassed NSView like this:
#interface MyView : NSView <NSDraggingDestination>{
NSImageView* imageView;
}
and implement it like this:
- (id)initWithFrame:(NSRect)frame
{
self = [super initWithFrame:frame];
if (self) {
[self registerForDraggedTypes:[NSImage imagePasteboardTypes]];
NSRect rect = NSMakeRect(150, 0, 400, 300);
imageView = [[NSImageView alloc] initWithFrame:rect];
[imageView setImageScaling:NSScaleNone];
[imageView setImage:[NSImage imageNamed:#"test.png"]];
[self addSubview:imageView];
}
return self;
}
- (NSDragOperation)draggingEntered:(id <NSDraggingInfo>)sender{
NSLog(#"entered");
return NSDragOperationCopy;
}
- (NSDragOperation)draggingUpdated:(id <NSDraggingInfo>)sender{
return NSDragOperationCopy;
}
- (void)draggingExited:(id <NSDraggingInfo>)sender{
NSLog(#"exited");
}
- (BOOL)prepareForDragOperation:(id <NSDraggingInfo>)sender{
NSLog(#"som");
return YES;
}
- (BOOL)performDragOperation:(id<NSDraggingInfo>)sender {
NSPasteboard *pboard = [sender draggingPasteboard];
if ( [[pboard types] containsObject:NSURLPboardType] ) {
NSURL *fileURL = [NSURL URLFromPasteboard:pboard];
NSLog(#"%#", fileURL);
}
return YES;
}
- (void)concludeDragOperation:(id <NSDraggingInfo>)sender{
NSLog(#"conclude sth");
}
- (void)draggingEnded:(id <NSDraggingInfo>)sender{
NSLog(#"ended");
}
- (BOOL)wantsPeriodicDraggingUpdates{
NSLog(#"wants updates");
}
- (void)updateDraggingItemsForDrag:(id <NSDraggingInfo>)sender NS_AVAILABLE_MAC(10_7){
}

Answer 1

If anyone still needs this, using:
[self registerForDraggedTypes:[NSArray arrayWithObjects:
NSFilenamesPboardType, nil]];
instead of:
[self registerForDraggedTypes:
[NSImage imagePasteboardTypes]]; // BAD: dropped image runs away, no draggingdestination protocol methods sent...
solved this problem for me. I suspect this works because my XIB is targeting osX 10.5. NSFilenamesPboardType represents a 10.5-and-previous 'standard data' UTI and [NSImage imagePasteboardTypes] returns 10.6-and-after standard data UTIs.
By the way, in - (BOOL)performDragOperation:(id NSDraggingInfo)sender, you can get a path for the file that was dropped with:
NSArray *files = [pboard propertyListForType:NSFilenamesPboardType];
Got the solution here:
http://developer.apple.com/library/mac/#documentation/Cocoa/Conceptual/DragandDrop/Tasks/acceptingdrags.html#//apple_ref/doc/uid/20000993-BABHHIHC