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假设我想创建一个响应从 Dock 拖放的应用程序。本质上，假设我将一个 .pdf 从桌面拖到 Dock 中的应用程序上。有什么功能可以接收该操作并对其做出反应？
在应用程序委托中：
- (void)application:(NSApplication *)sender openFiles:(NSArray *)filenames
当然这也是需要的：
