Question

我正在尝试通过本地通知获取待处理通知请求。它引发了我的错误： ＆＃34;类型＆＃39;（_）抛出函数的转换无效 - ＆gt;虚空＆＃39;到非投掷功能类型＆＃39;（[UNNotificationRequest]） - ＆gt;虚空＆＃39; ＆＃34;

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

你可能想这样做，

    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正在抛出，但是这行代码并不正确：

try{
    var notificationContent:UNNotificationContent = notificationRequest.content
    }

正确的方法是：

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

Answer 3

问题出在你的try块中。因此，您可以替换它，如下所示。

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

投掷函数类型＆＃39;（_）抛出的转换无效 - ＆gt;虚空＆＃39;到非投掷功能类型＆＃39;（[UNNotificationRequest]） - ＆gt;空虚

3 个答案: