registerForDraggedTypes与自定义文件格式 [英] registerForDraggedTypes with custom file formats

问题描述

开发人员文档并未完全说明registerForDraggedTypes方法。例如，我想我的应用程序只允许访问* .abc文件。

Developer Documentations doesn't provides fully describe of registerForDraggedTypes method. For example, i want that my app allow access only "*.abc" files. How can i do this?

推荐答案

如果你想把文件拖到你的视图，你应该注册 NSFilenamesPboardType 类型。如果你只想接受某些文件名，你可以在你的实现 performDragOperation：。类似：

If you'd like to have files dragged onto your view, your should register for the NSFilenamesPboardType type. If you want accept only certain filenames, you can do that in your implementation of performDragOperation:. Something like:

- (BOOL)performDragOperation:(id < NSDraggingInfo >)sender {
    NSArray *draggedFilenames = [[sender draggingPasteboard] propertyListForType:NSFilenamesPboardType];
    if ([[[draggedFilenames objectAtIndex:0] pathExtension] isEqual:@"abc"])
        return YES;
    else
        return NO;
}

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