将WebView中的图像拖到IKImageView上

IKImageView 可能是在期待一个 NSFilenamesPboardType ,webview如何处理拖动图像?

事实证明,在我的情况下,处理d'n'd最好的方法是通过 WebArchivePboardType .

- (BOOL)performDragOperation:(id <NSDraggingInfo>)sender
{
    NSPasteboard *pboard;
    NSDragOperation sourceDragMask;

    sourceDragMask = [sender draggingSourceOperationMask];
    pboard = [sender draggingPasteboard];

    // Create image data from webarchive stored in a pasteboard.    
    NSData *image = [pboard dataForType:WebArchivePboardType];
    WebArchive *webArchive = [[WebArchive alloc] initWithData:image];

    // Let's see what are we dragging.
    for (WebResource *subresource in [webArchive subresources])
    {
        NSString *mimeType = [subresource MIMEType];
        if ([mimeType hasPrefix:expectedMimeTypeStartsWith])
        {
            NSData *data = [subresource data];

            CFDataRef imgData = (CFDataRef)data;
            CGDataProviderRef imgDataProvider = CGDataProviderCreateWithCFData (imgData);

            CGImageRef image;

            if ([mimeType hasSuffix:@"png"])
            {
                image = CGImageCreateWithPNGDataProvider(imgDataProvider, NULL, true, kCGRenderingIntentDefault);   
            }
            else if ([mimeType hasSuffix:@"jpeg"])
            {
                image = CGImageCreateWithJPEGDataProvider(imgDataProvider, NULL, true, kCGRenderingIntentDefault);
            }

            [self setImage:image imageProperties:nil];
        }
    }
    return YES;
}