从类型为（（_）的throwing函数-> Void'无效转换为类型为非抛出函数'（[[UNNotificationRequest]）-> Void

Question

我正在尝试获取有关本地通知的待处理通知请求。 它引发了我错误： “从类型为（（_）的throwing函数将-> Void'转换为非抛出函数类型为'（[[UNNotificationRequest]）-> Void'的无效转换”

我的代码是：

var notificationTitle = "\(String(describing: notificationData!["title"]))"
var notificationInterval: Int = notificationData!["interval"] as! Int
let center  =  UNUserNotificationCenter.current()
center.getPendingNotificationRequests(completionHandler: {(requests) -> Void in
    var notificationExist:Bool = false
    for notificationRequest in requests {
        try{
            var notificationContent:UNNotificationContent = notificationRequest.content
        }
    }

Answer 1

您可能想要这样，

    center.getPendingNotificationRequests(completionHandler: {requests -> () in
        var notificationExist:Bool = false
        for notificationRequest in requests {
            do {
                var notificationContent:UNNotificationContent = try notificationRequest.content
            }
            catch {
                print(error)
            }
        }
    }

Answer 2

我不确定您的代码的哪一部分被抛出，但是您的代码的这一行是不正确的：

try{
    var notificationContent:UNNotificationContent = notificationRequest.content
    }

正确的方法是这样的：

do {
    var notificationContent:UNNotificationContent = try notificationRequest.content
}
catch {
print(error)
}

Answer 3

问题出在您的try块中。 因此，您可以如下所示更换它。

guard let notificationContent:UNNotificationContent = try? notificationRequest.content else {
    print("There was an error!")
}