我有以下代码(编辑:更新了代码,以便所有人都可以编译并查看):
import UIKit
struct Action
{
let text: String
let handler: (() -> Void)?
}
class AlertView : UIView
{
init(actions: [Action]) {
super.init(frame: .zero)
for action in actions {
// let actionButton = ActionButton(type: .custom)
// actionButton.title = action.title
// actionButton.handler = action.handler
// addSubview(actionButton)
}
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class TextAlertView : AlertView
{
init() {
super.init(actions: [
Action(text: "No", handler: nil),
Action(text: "Yes", handler: { [weak self] in
//use self in here..
})
])
}
required init?(coder aDecoder: NSCoder) {
fatalError("init(coder:) has not been implemented")
}
}
class MyViewController : UIViewController {
override func viewDidLoad() {
super.viewDidLoad()
let alert = TextAlertView()
view.addSubview(alert)
self.view = view
}
}
每次我实例化TextAlertView
时,它都会在访问权限不佳的super.init
上崩溃。但是,如果我改变:
Action(title: "Yes", { [weak self] in
//use self in here..
})
为:
Action(title: "Yes", {
//Blank.. doesn't reference `self` in any way (weak, unowned, etc)
})
它有效!
在超级初始化过程中,有没有办法在动作块中引用self
弱或不弱(在上面我是在super.init
的参数中做的?
代码编译..它只是在运行时随机崩溃。