我执行的NSPopUpButton(使用雨燕MacOS的应用程序),如图片:
而且,我有以下的代码,它的实际工作:
enum Importance: Int8 {
case EXTREMELY_IMPORTANT = 5
case VERY_IMPORTANT = 4
case IMPORTANT = 3
case NORMAL = 2
case NOT_IMPORTANT = 1
case JUST_FOR_RECORD = 0
case ERROR = -1
}
let english_extremely_important = "Extremely Important"
let english_very_important = "Very Important"
let english_important = "Important"
let english_normal = "Normal"
let english_not_important = "Not Important"
let english_just_for_record = "Just for Record"
var importanceEnglishItems: [String] = {
return [
english_extremely_important,
english_very_important,
english_important,
english_normal,
english_not_important,
english_just_for_record
]
}()
func getImportance(importanceEnglish: String) -> Int8 {
switch importanceEnglish {
case english_extremely_important:
return Importance.EXTREMELY_IMPORTANT.rawValue
case english_very_important:
return Importance.VERY_IMPORTANT.rawValue
case english_important:
return Importance.IMPORTANT.rawValue
case english_normal:
return Importance.NORMAL.rawValue
case english_not_important:
return Importance.NOT_IMPORTANT.rawValue
case english_just_for_record:
return Importance.JUST_FOR_RECORD.rawValue
default:
return Importance.ERROR.rawValue
}
}
每当用户选择弹出菜单中的项目,该代码执行:
@IBAction func handleImportancePopUpButtonSelectionChanged(_ importancePopUpButton: NSPopUpButton) {
let importanceIndex = getImportance(importanceEnglish: importancePopUpButton.titleOfSelectedItem!)
print("importanceIndex: \(importanceIndex)")
}
它的工作原理,但是......我相信这个实现是不是优雅。什么是更好的方式来做到这一点?
我心里有以下要求:
我怎样才能让我的银行代码更漂亮?
我会改变封装一点点,使其更具可读性;这样的解决方案将是一个更好的方式开始,在我看来,(例如添加本地化或通过新的价值扩展它,等...)。
这个想法显然不是唯一的方法 - 还有许多其他的改变/解决方案可能是因为这是很好的(或者甚至更好)。
enum Importance: Int, CaseIterable {
case extremelyImportant = 5
case veryImportant = 4
case important = 3
case normal = 2
case notImportant = 1
case justForRecord = 0
var friendlyName: String? {
switch self {
case .extremelyImportant: return "Extremely Important"
case .veryImportant: return "Very Important"
case .important: return "Important"
case .notImportant: return "Not Important"
case .justForRecord: return "Just for Record"
default: return nil
}
}
init?(withName name: String) {
guard let importance = Importance.allCases.first(where: {
guard let friendlyName = $0.friendlyName else { return false }
return friendlyName == name
}) else { return nil }
self = importance
}
static var allCasesNames: [String] {
return Importance.allCases.compactMap { $0.friendlyName }
}
}
您可以创建一个标题NSMenuItem
和重要性的标签,并将其添加NSPopUpButton.menu.items
。
override func viewDidLoad() {
super.viewDidLoad()
popUpButton.menu?.items = self.importanceEnglishItems
}
class func MenuItem(title: String, tag: Int) -> NSMenuItem {
let item = NSMenuItem(title: title, action: nil, keyEquivalent: "")
item.tag = tag
return item
}
var importanceEnglishItems: [NSMenuItem] = {
return [
MenuItem(title: "Extremely Important", tag: 5),
MenuItem(title: "Very Important", tag: 4),
MenuItem(title: "Important", tag: 3),
MenuItem(title: "Normal", tag: 2),
MenuItem(title: "Not Important", tag: 1),
MenuItem(title: "Just for Record", tag: 0)
]
}()
@IBAction func handleSelection(_ sender: NSPopUpButton) {
guard let item = sender.selectedItem else { return }
print("importanceIndex: \(item.tag)")
}