ios - 如果日历访问被拒绝，则显示警报 Swift 3

Question

如果用户拒绝访问日历，我会尝试弹出“转到设置”警报。一旦用户拒绝日历并重新打开应用程序，它就会起作用。但我需要在用户拒绝访问后立即弹出警报。

这是我的日历访问代码:

/**
 */
func requestDeniedAlert() -> UIAlertController {
let requestAlertController = UIAlertController(title: "Calendar Access Denied", message: "Please Allow Calendar Access In Settings", preferredStyle: .alert)
let settingsAction = UIAlertAction(title: "Go To Settings", style: .default){(action) in
    print("The User Will Be Taken To the Settings")
    let goToSettings = URL(string: UIApplicationOpenSettingsURLString)
    UIApplication.shared.open(goToSettings!)
}
requestAlertController.addAction(settingsAction)

return requestAlertController
}

/**
 reuestCalendarPermissions:
 @param
 @return
 */
func requestCalendarPermissions() {
eventInstance.requestAccess(to: .event, completion: {(accessGranted: Bool, error: Error?) in

    if accessGranted == true {
        print("Access Has Been Granted")
        MainScreenTableView.flagVariable.statusFlag = true
    }
    else {
        print("Change Settings to Allow Access")
        MainScreenTableView.flagVariable.statusFlag = false
    }
})
}

/**
 checkStatus:
 Notes: This function checks if the User has given calendar access to app
 If access is restricted or denied, a "Go To Settings" view will appear
 */
func checkStatus() {
let currentStatus = EKEventStore.authorizationStatus(for: EKEntityType.event)

if currentStatus == EKAuthorizationStatus.notDetermined {
    requestCalendarPermissions()
}
else if currentStatus == EKAuthorizationStatus.authorized {
    print("Access Has Been Granted")
    MainScreenTableView.flagVariable.statusFlag = true
}
else if (currentStatus == EKAuthorizationStatus.denied) || (currentStatus == EKAuthorizationStatus.restricted){
    print("Access Has Been Denied")
    MainScreenTableView.flagVariable.statusFlag = false
}
}

我正在使用 UITableViewController ，这似乎是让这变得如此痛苦的原因。我现在的方式是设置一个标志，然后在表格 View 中显示警报。但我无法在用户拒绝访问后立即弹出警报。

感谢您的帮助!

Answer 1

简单的解决方案是在 accessGranted == false 时从调用 eventInstance.requestAccess 的完成处理程序内部显示警报。

当一次请求访问且用户点击“拒绝”时，或者此后用户运行应用且访问仍被拒绝时，

accessGranted 将为 false。