NSWindow支持Drag-and-Drop

在NSView中，通过registerForDraggedTypes:来支持Drag-and-Drop。

[self registerForDraggedTypes:@[NSColorPboardType, NSFilenamesPboardType]];

对于NSWindow，通过awakeFromNib来支持Drag-and-Drop

@interface ONMainWindow ()


@end


@implementation ONMainWindow


- (void)awakeFromNib {
    [self registerForDraggedTypes:@[NSFilenamesPboardType]];
}


#pragma mark - NSDraggingDestination
// 拖放显示图标
- (NSDragOperation)draggingEntered:(id)sender {
    return NSDragOperationCopy;
}


- (NSDragOperation)draggingUpdated:(id)sender {
    return NSDragOperationCopy;
}


// 拖放操作
- (BOOL)performDragOperation:(id)sender {
    NSPasteboard *pboard = [sender draggingPasteboard];
    NSArray *filenames = [pboard propertyListForType:NSFilenamesPboardType];
    
    if (1 == filenames.count) {
        if ([[NSApp delegate] respondsToSelector:@selector(application:openFile:)]) {
            return [[NSApp delegate] application:NSApp openFile:[filenames lastObject]];
        }
    }
    return NO;
}

我们在MainWindow.xib中，把Window设置为ONMainWindow。

然后，拖放文件到Windows窗口上，就可以再performDragOperation:中收到我们拖放的文件名或文件路径。

[0] __NSCFString * @"/Volumes/Info/Library/Developer/Shared/Documentation/DocSets/com.apple.adc.documentation.AppleOSX10.9.CoreReference.docset/Contents/Resources/Documents/samplecode/CocoaDragAndDrop/Listings" 0x0000608000185480