Ios EKEventEditViewController显示一个禁用的添加按钮 问题

我正在展示一个带有一些预定义信息的

EKEventEditViewController

视图。如果用户不想更改此信息，他应该能够点击Add将事件添加到日历中

问题是，“添加”按钮在默认情况下处于禁用状态。仅当用户更改某些内容（例如，事件名称或日历）时，才会启用该功能

代码片段 EKEventEditViewController 以下是如何显示

EKEventEditViewController

：

还有一件事 我注意到的另一件事是，当我从我的

EKEvent

对象中删除开始和结束日期时，默认情况下会启用Add按钮

---

如何配置我的

EKEvent

对象，使其具有自定义的开始和结束日期，并在默认情况下启用

EKEventEditViewController

的添加按钮？

这在iOS 13.3 beta版上已修复

在iOS 12.2.x上：显然，EKEventEditViewController将您的事件视为已存在的事件，而不是新事件。因此，禁用添加按钮，因为没有任何更改（Apple bug）

证明这一点的一个小方法是尝试通过删除一个字符来编辑标题，这将启用添加，因为现在它已从原始更改。如果您将刚刚删除的字符放回原处，它将再次禁用“添加”按钮

我们发现的一个解决方法是将EKEventEditViewController子类化，如下所示：

final class FixedEventEditViewController: EKEventEditViewController {
    /// Set this variable instead of the `event` property to avoid a crash on iOS 12+ when a fixed timezone is set
    var deferredEvent: EKEvent?

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        if let deferredEvent = self.deferredEvent {
            // Trick iOS into thinking that the event changed so it enables the Add button on iOS 13.2.x -> Fixed starting iOS 13.3
            let titleDeferred = deferredEvent.title
            deferredEvent.title = nil
            // Set the event to the new deferred event that contains no title
            self.event = deferredEvent
            // Set the original title. This will let iOS think the event changed and enable the Add button
            self.event?.title = titleDeferred
        }
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        // This is to hide the keyboard
        self.view.endEditing(true)
    }
}

final class FixedEventEditViewController: EKEventEditViewController {
    /// Set this variable instead of the `event` property to avoid a crash on iOS 12+ when a fixed timezone is set
    var deferredEvent: EKEvent?

    override func viewWillAppear(_ animated: Bool) {
        super.viewWillAppear(animated)

        if let deferredEvent = self.deferredEvent {
            // Trick iOS into thinking that the event changed so it enables the Add button on iOS 13.2.x -> Fixed starting iOS 13.3
            let titleDeferred = deferredEvent.title
            deferredEvent.title = nil
            // Set the event to the new deferred event that contains no title
            self.event = deferredEvent
            // Set the original title. This will let iOS think the event changed and enable the Add button
            self.event?.title = titleDeferred
        }
    }

    override func viewDidAppear(_ animated: Bool) {
        super.viewDidAppear(animated)
        // This is to hide the keyboard
        self.view.endEditing(true)
    }
}