如何在节时将动作从NSCombobox发送到功能？
我正在以编程方式创建一个组合框，我想从下拉菜单中引起选择以调用功能。 如果要使用-em> mybutton.action = #selector（some_function（_：）），我可以做到这一点，但是它与NSCombobox无法使用。 这是我的代码中的一个示例：
func populate_scroller_with_combobox(json_file: Array<Any>, panel: NSView)
{
let combox = NSComboBox()
combox.identifier = NSUserInterfaceItemIdentifier(rawValue: "combobox1")
combox.addItem(withObjectValue: "None")
combox.addItems(withObjectValues: json_file_content)
combox.numberOfVisibleItems = 10
combox.isEditable = false
combox.action = #selector(some_function(_:))
combox.selectItem(withObjectValue: "None")
panel.addSubview(combox)
combox.frame = CGRect(x:190, y: 30, width: 170, height: 26)
}
@objc func some_function(_ sender: NSButton)
{
print ( "Combobox value changed." )
}
I'm creating a combo box programmatically and I would like to cause the selection from the drop down menu to call a function.
I can do it if i'm creating a button using - myButton.action = #selector(some_function(_:)), but it doesn't work with an NSComboBox.
here is an example from my code:
func populate_scroller_with_combobox(json_file: Array<Any>, panel: NSView)
{
let combox = NSComboBox()
combox.identifier = NSUserInterfaceItemIdentifier(rawValue: "combobox1")
combox.addItem(withObjectValue: "None")
combox.addItems(withObjectValues: json_file_content)
combox.numberOfVisibleItems = 10
combox.isEditable = false
combox.action = #selector(some_function(_:))
combox.selectItem(withObjectValue: "None")
panel.addSubview(combox)
combox.frame = CGRect(x:190, y: 30, width: 170, height: 26)
}
@objc func some_function(_ sender: NSButton)
{
print ( "Combobox value changed." )
}
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如果其他人遇到同一问题，这是解决方案：
添加到您的ViewController类“ NSComboboxDelegate”中。
在您的ComboBox创建功能中添加'combox.delegate = self'。
添加另一个称为func的函数“ ComboboxSelectionDidchange（_通知：通知）”，该功能将由选择更改触发
here is the solution in case that anyone else run into the same issue:
add to your ViewController Class 'NSComboBoxDelegate'.
to your combobox creation function add 'combox.delegate = self'.
add another function called func 'comboBoxSelectionDidChange(_ notification: Notification)' which will be triggered by the selection changes
自从我使用NSCombobox以来，这是一个Looooonnnnggg的时间。
回顾文档，它似乎遵循数据源＆amp;表视图使用的委托模式。
您需要让一些对象符合NSComboboxDelegate协议，并将其设置为组合框的代表。然后，当用户进行选择时，您的代表的
comboboxSelectionDidchange（_：）方法将被调用。您可以创建一个自定义
nscontrol，该管理nscombobox并用作组合框的代表，并且当用户选择一个valuechange的事件类型时，控件会生成IBACTION物品。It's been a looooonnnnggg time since I've used an NSComboBox.
Reviewing the docs, it seems to follow the data source & delegate pattern that table views use.
You need to have some object conform to the NSComboBoxDelegate protocol and set it as the combo box's delegate. Then your delegate's
comboBoxSelectionDidChange(_:)method will be called when the user makes a selection.You could create a custom
NSControlthat manages anNSComboBoxand serves as the combo box's delegate, and have the control generate an IBAction with an event type of valueChanged when the user selects an item.