MacOS 开发（十二） : 文件选择

    @objc func pickFile(_ allowedFileTypes: [String] = ["jpg","png"], allowsMultipleSelection: Bool = false) {
        
        let panel = NSOpenPanel()
         
        // prompt : 修改默认打开按钮的文字
//         panel.prompt = "打开"
        panel.message = "不要随便选择文件"
         // 设置文件打开的类型: 默认为空,表示可以选择任意类型的文件
        panel.allowedFileTypes = allowedFileTypes
        panel.allowsMultipleSelection = allowsMultipleSelection
//        panel.canCreateDirectories = true

        // 设置默认打开的文件路径
        let pathUrl = URL(string: "\(NSHomeDirectory())/Downloads")
        panel.directoryURL = pathUrl
//        openpanel.allowsMultipleSelection = false
        panel.delegate = self
         
        // 显示openpanel
        panel.begin { (response) in
            if response == NSApplication.ModalResponse.OK {
                for u in panel.urls {
                    print(u.absoluteString)
                }
            }
        }
     }