swift - 无法将类型 '[AnyObject]' 的值转换为预期参数类型 '[UIUserNotificationAction]?'

Question

var category:UIMutableUserNotificationCategory=UIMutableUserNotificationCategory()
category.identifier="DEFAULT_GATEGORY"
let defaultAction:NSArray=[action]
category.setActions(defaultAction as [AnyObject] as [AnyObject], forContext: UIUserNotificationActionContext.Minimal)

Answer 1

假设 action 的类型为 UIUserNotificationAction:

var category = UIMutableUserNotificationCategory() // NOTE: type not needed.
category.identifier = "DEFAULT_GATEGORY"
let defaultAction = [action] // NOTE: Type not needed.
category.setActions(defaultAction, forContext: UIUserNotificationActionContext.Minimal)

<小时/>

如您所见，我所做的只是删除不需要的(和误导性的)类型信息。我发现依靠 Swift 的自动类型确定系统很有帮助。

<小时/>

使用以下 Playground 代码进行测试:

let action = UIMutableUserNotificationAction()
var category = UIMutableUserNotificationCategory()
category.identifier = "DEFAULT_GATEGORY"
let defaultAction = [action]
category.setActions(defaultAction, forContext: UIUserNotificationActionContext.Minimal)