其他答案可以使用,另一个选项是使用反引号.这样做不需要定义strongSelf,并允许使用自己,而不必打开可选的自我.
let c: () -> Void = {
[weak self] in
guard let `self` = self else {
throw NSError(domain: "self was destroyed",code: 1,userInfo: nil)
}
self.doSomethingNonOptionalSelf()
}
