NSWindow支持Drag-and-Drop

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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。

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

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