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 () <NSDraggingDestination>@end@implementation ONMainWindow- (void)awakeFromNib {    [self registerForDraggedTypes:@[NSFilenamesPboardType]];}#PRagma mark - NSDraggingDestination// 拖放显示图标- (NSDragOperation)draggingEntered:(id<NSDraggingInfo>)sender {    return NSDragOperationCopy;}- (NSDragOperation)draggingUpdated:(id<NSDraggingInfo>)sender {    return NSDragOperationCopy;}// 拖放操作- (BOOL)performDragOperation:(id<NSDraggingInfo>)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。

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